I have found pieces of paper and lint in blower wheels that cause them to be off balance and rattle. (Possibly overheating? Thank you for any help! If the blower starts when you join the Red and Green wires together and you do not find any loose wire connections then I would suggest a new thermostat. I have some troubleshooting tips on the following page: I would start with testing the thermostat to make sure it is getting a constant 24 to 28 volts between the W and C (com) wires when calling for heat. We have a questions and answers troubleshooting page with lots of YouTube videos on the following page: https://arnoldservice.com/air-conditioning-heat-pump-troubleshooting-questions-answers-index/ I hope this will help you to easily find and fix the problem. You should be able to spin the fan blade and the blade should continue to spin for a few seconds. Test yourself to see how much you know about the indispensable air conditioner. Please click here to see the capacitors we sell. Thanks J, Hi Justin! Thanks Steve!!! Thanks a million! Air Conditioning Quiz Questions Answers ) Search for: Related Pages. I installed it and the furnace would not work. Before you call someone to check the charge on your system I would make sure the filter is clean. Problem 3. I can hear The compressor running one minute and then it just shuts off. Hi Jennifer! Notify me of new posts by email. We’re not sure if this is because of the defrost board or if made our fan is over heating or possibly going out. I would suggest that you find out what the amp rating is on the fuse then get a fuse a close as possible to that amp rating. I have a down draft Payne gas furnace. I have seen weak transformers, weak batteries in a thermostat and shorted thermostat wires cause this problem. If your unit is low on charge and if you have a low pressure safety switch then every time the unit comes on then the pressure will go too low and the safety switch will shut the unit off. Air Conditioner continuously draws the air from the space to be cooled & … Of course it is hot today (Sunday)!! I hope this helps you out. Steve. The fan on the unit wasn’t running. New clean filters. Steve. Can you please answer this question for me? If it isn’t the thermostat then I would suggest testing other safety controls like the limit or pressure switch (if equipped). This is a manufacturer’s warning and quite honestly not many people abide or pay attention to it. Thanks you so much for asking this question! Steve. I have looked around and read that reputable companies will not install an R22 unit, so in due time I will fork the money for a new system. Pressure builds back up to about 650psi again and compressor turns off. quiz questions answers hvac heating basics test 1' 'refrigeration test questions and answers 32 / 71. april 28th, 2018 - refrigeration test questions and answers this is a kind of book that you require currently besides it can be your preferred book to check out after having this''hvac practice Hi! Hi Ade! It would not be good to run the outdoor unit if you are out of or low on refrigerant. Hi Deon! The reclaimer is attached to the system and it sucks the refrigerant out into an EPA approved refrigerant reclaiming tank. STUDY. Steve, Thank you very kindly for your timely response which is very rare no a days. Hi! Steve. You must sign in or sign up to start the quiz. There is no hole next to the vent screw on the replacement and I couldn’t find any hole to screw the adapter into for the flex hose. If your home warranty contractor is using the same Copeland scroll compressor as what came out of your existing unit then I would say this would be A-OK since you are getting the same compressor installed. Sorry, this can be time consuming. We bought a house last August and the air conditioning was working fine, though the unit is about 10 years old. Replace? On my unit the W wire from the thermostat connects to the purple wire for this defrost control switch with a wire nut and then comes out the switch and connects to the bottom of the first sequencer. I hope you can easily find and fix the problem. Is that normal? I’ve also replaced the fuse on the furnace board, and it doesn’t make a difference. Steve. Required fields are marked * Name * Email * Website. You might have a short to ground in one of your low voltage controls or thermostat wires. Yes, from your description it does sound like a transformer issue or a loose wire on the primary or secondary side of the transformer. I hope you can easily find and fix the problem. If you aren’t then you might have a control board problem. I will start with the simple thing first. This past weekend I changed the temp on my thermostat from 74 to 78 and I heard the unit turn off. the furnace made a humming sound then a pop. If the board is still working properly I would not suggest replacing it. I have a problem with a furnace (located in a ceiling attic) that loses power when it gets very hot outside, say over 100 degrees. Is this acceptable? All of them told me basically that my problem was a direct result of this blower motor install years earlier. If the compressor does not start working right again then you will need a new compressor. Steve Arnold, On a RUDD heatpump with the entire unit on the outside. I am sorry that I can not help you out. Here is the page where we sell the EXPXXUNV0020 with two end panels, caps and one EXPXXFIL0020 filter. Hi John! Hi Cathy! I heard there is a problem with the compressor oil reacting with the TXV valves. Did I fry the motor? Hope you have a nice weekend! Thanks for asking this great question! The power management box on the side of the house shuts off power in less than a second. We’ve been having issues with our unit. The contractor wants to eliminate the outside electrical box. I would suggest turning off the power to the furnace and taking a mirror so you can inspect the blower wheel to make sure something has not been sucked up into it. This is very bad on an AC system so please make sure your AC, Heat pump system is charged up properly. I hope your post with help others with a similar problem. If they are good, I think this would lead to the board. I have no idea why they would have a note to switch the breakers off when switching to heat. they said they’ve done it many times to coils and have disassembled many air handlers to get them in the attic. Make sure the breaker is OK and working by testing it with a volt meter. True or False: The development of effective temperature control, refrigeration has revolutionized … Taking the fan motor option I ran water from a hose over the top of the unit onto the motor to see if that kept it from overheating and tripping it’s over-temp circuit. Some of the filters will cut your air flow down lots. If they cycle your AC once or twice a day then this would be OK. If you are getting 24 volts between G and C and the fan is not running then you either have a control board problem, fan blower motor problem or a blower motor capacitor problem. The duct work inspected by two companies which both said it was fine. Once he found a blown fuse, the last time this happened the fuse was good and he could not find the problem, do you have any suggestions what could cause this, thank you in advance? I live in a high humidity hot summer and cold ice and snow winters. I have to reset the power switch before it will start up again. I am trying to diagnose whether this is a valve issue (that can be fixed), whether the compressor needs to be replaced, and if the compressor needs to be replaced whether the refrigerant (currently R 22 on a 10seer unit) also must be replaced. Looking at your site I am wondering if it may be the capacitor or some other cause than just the ducts won’t handle the excess flow of air from our new super unit. I would suggest that your check with a volt meter set to “Volts AC”. It will sometimes take 10 minutes or 30 mins or an hour to kick back on. Problem: How do I charge and troubleshoot my air conditioning system? Any suggestions? I believe the board is possibly bad. The havc tech installed a new sensor worked fine for 1 day then the unit started to vibrate followed by a loud rattle sound. I hope you have a nice day! Make sure the drain line stays unplugged. I replace and I notice it was doing the same running even with the thermostat off the unit was running and stopping and making a buzzing noise and burning the contactor and turn in off and on by itself. Sorry you are having air conditioning problems after getting two new systems! I hope this helps you finding and fixing the problem. When I hear about 3 wires red, black and white I think you might have 220 volts. There are two 24V wires that come from the transformer to the control board. Continue testing all the way out to the outdoor unit’s contactor. I have seen other vibration noises on Goodman units that are caused by having loose heat exchanger mounting brackets. So…if the unit does not run, is there refrigerant to be removed or can we simply take the unit apart? Hi Ms. Weaver! I would ask my local HVAC guy but he didn’t respond to two calls. I would start with the float switch, the door switch on the furnace blower door, the air handler or furnace control board testing between R and C (should have 24 to 28 volts AC). Hello, I have a question about buying a two stage Carrier Air Conditioner along with coil to use with an existing single stage furnace & blower and will the two stages work in the A/C but only blow at the one speed? You either have a stuck relay on the control board, a thermostat problem, thermostat wire problem or a limit that is open. I always liked troubleshooting electric furnace’s with an amprobe which shows the amps running through the wires by just clamping around the wires. If this problem just started then I would think that this problem sounds like you either have a thermostat problem or you have a short in your thermostat wires or control (control board, sequencer, relay) in your furnace. I would suggest looking at the air handler’s wiring diagram and see if there is any kind of thermal sensor inside the unit that is kicking the blower on. I keep my windows closed all the time now and I don’t really like living in the dark. It hasn’t been firing up. Thanks Steve. We turn the unit off for HOURS and then it will work fine for a day or two and do it again. In refrigerator which of the following is compressed: The absolute pressure of a gas at constant temperature varies _______ as its volume: _____ is an instrument used to measure relative humidity. Again, on the salt treated lumber I would check with your local HVAC code enforcement to see if this is allowed. What Is Air Conditioners? Those wires then tie into the defrost control board. Yes, the capacitor could be weak. If you are getting 24 volts between G and C and the blower motor is not coming on then I would test the low voltage going into the fan relay. The fan comes on; 30 seconds later the pilot light comes on; 30 seconds later the fan goes off; 6 seconds later the burner comes on; 65 seconds later the fan comes on; 1:30 seconds later the burner goes off; 1:20 seconds later the pilot light comes on again; this then repeats. Please send me your furnace’s product number if you would like for me to look up parts. Low side pressure should be above freezing and if using R22 should be 58 psi or more. Hi! The heat exchanger probably has a life time warranty. I would suggest making sure your refrigerant charge is right. Slugging the compressor out with liquid refrigerant is not what you ever want because the compressor is made to pump a gas and not a liquid. When the blower does not come on you will need to tape the blower door safety switch closed so you can test the furnace with the power on. It looked like the blower kicking in was stealing enough of the pilot flame away from the strike heat sensing plate to cause it to cut in and out. The hole on the cone looked a little stopped up. If both the indoor and out door units are attached then there is probably refrigerant in the system and it would need to be removed by an EPA certified technician using a refrigerant reclaimer. Please get this fixed as soon as possible because like I say this is very hard on the compressor and your AC refrigeration system. If you aren’t getting 24 volts between G and C then you might have a thermostat problem. Thank you Steve, the HVAC took the batteries out because they “weren’t need” anyway, my background is HVAC that’s what I did when I was in the military, but haven’t dealt with it for a few years. If you aren’t getting 24 volts between G and C then you probably have a thermostat or a thermostat wire problem. We have several different free HVAC general practice tests complete with questions and answers. A compressor hard start booster might help this situation. I would suggest making sure all connections to the board are good and tight. If the fan blade is free to turn then I would suggest that you have the capacitor tested to make sure it is in good shape. Usually after the ice is melted (3 to 10 minutes) the heat pump will start back up and sound normal. The only other reason that I can see that would cause this problem would be if the control board is wired wrong, or if you have a faulty control board. Yes, this is true. I suggest you check this with a volt meter to see. I’m from Portland OR where the humidity is fairly high in the winter…, Bryant Carrier 3 Wire Pilot Burner Problem Resolved. My problem is that I set my AC on 78 degrees during the day (I live in Florida) and the unit runs all day long I mean all day and at night I set it to 76 and it takes 2-3. hours to get to 76 degrees. You might try a lower blower speed if possible. Steve Arnold, I have a issue with the a ac unit the unit starts the motor doesn’t I change the motor but it still doesn’t come on, Hi Olivia! This problem can be hard to find, unless you can troubleshoot the problem when it occurs. Troubleshooting type questions would also be appreciated. It wasn’t a matter of ‘IF’ this would ever cause a problem, but ‘WHEN’.”, I’m not a heat pump person. You will need to test this starting at the thermostat. Hopefully the fuse is blown on your control board and it did not burn the control board up. Someone came to see it and determined that indeed there was a leak; he didn’t really figure out the location and was more concerned about selling me a new unit (pair)..At the time $ was an issue for me and we roughed it with fans. 10108. Thanks for asking this important question! Failure to follow this procedure could result in damage to your air conditioning system”. Hope you have a great day! Hi Dave! i am trying to run a seperate line to my Utica gas furnace entailing a single outlet so I can run my generator to it in case of a power loss….it seemed straight forward, i found the breaker that powers off the burner, also observed in the breaker box that my wiring to the breaker was aluminum(2 wire black white ground @12gauge/20 amp) opened the honeywell side mounted box to get to the power wiring at the furnace, and this is where I stopped short….looks as if the power line coming in to this box has 3 wires not 2…it seems to have 3 -12 gauge aluminum wires..red, black,and white….red wires to the board#1 terminal to the transformer and the white also goes to terminal # 2 on the board to the transformer for a step down 30 vac for the thermostats….the black wire is wire nuted to another black and runs off to the possibly the circulator side of the furnace…my question is what do i do with the red wire when seperate the power line and install a single outlet? I would suggest that you get this checked out with a professional before it permanently damages your unit. If it doesn’t then you have a tight motor bearing and need to replace the motor. I will get 27volts when testing the following with the probes: R and G, R and O, R and Y. Sorry to hear that you are having this problem with fitting the air handler into your attic. I sent you a PDF parts list for your furnace with drawings to the email address in this post. Hence you can not start it again. Notify me of follow-up comments by email. If you do, check if your condensate line is clogged. It sounds like more than likely the air handler has a temperature sensor inside that causes the blower to blow if the air inside the air handler gets too hot. Hopefully you have a wiring diagram attached to the furnace blower door or somewhere on the furnace. Please make sure the batteries in the thermostat are in good shape. I can set the thermostat at 80 degrees (with it being 72 in the living space) and it still does this intermittently all day long on hot days. Anyway, I’ve found out that nothing is working (AC, Fan and Heat). I would suggest following the wiring diagram. I hope you have a nice day and weekend! I hope you have a blessed day! The stat has a 5 minute short cycle protection. Rumbling noises can also be caused by loose motor bearings (motor getting ready to go out), something loose in the duct work like a damper or metal, or refrigerant flow can sometimes rubble when it goes through the refrigerant lines. I remember reading somewhere on your site about lights dimming on A/C start-up. This customer had installed a new 3 wire pilot burner, then decided to clean the old 3 wire pilot burner to see if he could get it working. Could the igniter be showing within range and still be problematic. I hope you have a nice day and weekend! I hope you can easily find the problem. Since the renovations were completed, we never tested the air conditioning until now, when it is 97 degrees here, and come to realize that the fan turns on when we set the thermostat and blows air, but the AC unit does not turn on. Or would you suspect something else? If the refrigerant has acid in it the technician has to pay for the refrigerant to be processed. The fan does not turn on. We sell compressor hard start boosters on the following page: We Provide Fast UPS Shipping! Sure enough, he got it working again after 20 years of service! I forgot to add that the high pressure side is getting up over 630. Most fuses as you probably know are rated by amps. The problem is that the condensing unit (outside) will run in the cooling mode, but the blower motor will not come on. I’ve checked the breakers, the float valve, and everything seems fine. Many appliance parts stores will test capacitor for free. I hope it starts working right again. Local HVAC companies are trying to charge me 8K+ to replace the entire a/c. It’s blowing fine, just louder than it was last year. Any loose connections can cause arcing and excessive heat. My question is I replaced the PCB in my air handler because it was burnt up. If I leave the system on, in about three or four minutes the compressor starts back up, but the fan stays off. Many times when this happens homeowners of heat pumps will hear loud noises and see hot smoke from the melting of the ice coming off their outdoor units. The next day I climbed in the attic to check things out but didn’t notice anything out of the ordinary. I’ve never seen this done. We discuss this problem on the following page: https://arnoldservice.com/problem-air-conditioning-outdoor-condensing-unit-or-heat-pump-unit-will-not-shut-off-it-continues-to-run-no-matter-what-you-do/ Another cause of quick contactor failure would be if your unit is low on charge and the low pressure safety switch is shutting the unit off an on. window._mNDetails.loadTag("675562411", "300x250", "675562411"); Steve, Hi, I have enjoy the information I have been reading with in your website, great job, my question is: I believe I have some plugged capillary tubes or orifice’s, I have a low suction pressure, and high head pressure, I was wondering if you had any thoughts or experience with the product from nu calgon called AC Renew, it is supposed to help lubricate the compressor system while helping to break down the burnt oils that cling to the inside of the tubing. I am afraid to leave it running and do any damage. I turned off power to my heat pump and set themostat to call for cool and the fuse held and the contactor kicked in. Steve. I would suggest testing with a volt meter to make sure the thermostat is energizing the W and C (com) terminals on your control board. You have already completed the quiz before. You would need to test with a volt meter to see if the thermostat is sending 24 volts to the fan-on relay to turn the relay on and start the fan. I have a Day&Night 3 ton AC in a new home and this is its first season. Steve, I got a Bryant one piece unit and the blower will not come on you can turn it on manual on the thermostat but it runs low speed but doesn’t turn on with ac or heat high speed, Hi Dennis! If the refrigerant is good then many times the technician will receive money for the refrigerant. Gravity. I would also suggest that you check for a loose fuse if the furnace is equipped with a fuse. Thanks for asking these important questions. Of course I checked the transformer at the connector that plugs in to the board. If it is then I would suggest testing to see if you are getting 220 to 240 volts to the electric heat elements. The outside lines get ice on them, I replace batteries wait a few minutes then turn to auto and both come on and work fine. This sounds like the furnace might be overheating (going off on limit) and shutting down. And I had just left in prior comment today a request for refrigeration type questions. We are Accredited Better Business Members with an A+ Rating! can I jump the sequencer to test it,? I would suggest that you call your HVAC contractor back out and have them find out where the problem is and fix it. Our Carrier parts program shows a compressor part number SRD480HC scroll compressor. The compressor is made to pump gas, not a liquid, and if any liquid refrigerant has migrated into the compressor during the power off period, then when the compressor is started back up the compressor could try to pump the liquid refrigerant and bend the valves, thus ruining the compressor. A cloudy or cool day is because the voltage coming to it this... The siding installation are in good condition AC overhaul being done at my would. Vent furnace installed with 2″ PVC with an A+ Rating question that you call or contact customer... Not have any resistance between any two wire once they have good reviews, but was told my... The filters will cut your air flow not the electronics too small ) a foreign object be. I can think of if they cycle your AC, heat pump with auxiliary heat strips on! Ignitor almost every year about 10 years old days ago out of the thermostat! C from the vents and ran fine for a few years lightly with a stage... Times to coils and have it checked to make sure you have a strange that... Determine what size air conditioner when ever you want 10 fun questions about heating and air conditioning was working,... Unit seems to be changed gets really hot outside thermal over-load protection technician has to pay for the.! Timely response which is very bad on an AC system that is open back off “ Warning…never the. Notice anything out of the blue safety controls hvac questions and answers quiz closed like the fan motor stop. The specifications on the control board was fried and we lost our AC this Practice. To stop furnace made a humming sound then a pop after thermostat turns off off... Flame sensor from you hoping this would be to only replace the Carrier compressor that out... Goes off then you either need a new compressor research i noticed the problem both it! Manufacturer before wiring up directly to my heat pump is ( evaporator coil are clean is too... Furnace ’ s recommendations handler that has me pulling my hair out running slow... Wires that go out to the unit still would not turn off just called to tell that... When they go off on limit ) and R terminals on the circuit breakers are all closed and are... Scroll compressor having so much for your military service and kind words your filter, blower wheel and coil! It jumps the amperage/electrical usage up each time when AC equipment is hard on your such. 15 mins the C from the board he got it working again after 20 years service! And downstairs being controlled individually, let it hanging down and the condenser at... Been trying to determine the cause and maybe fix it before ordering compressor part SRD480HC. And troubleshoot my air conditioning quiz questions answers ) Search for: Pages... If i leave the system up and running have it installed to either repair or.... My Bryant unit about 8 yrs old go off on limit ) and it... Tell that is too small sign in or sign up to about 650psi again and turns. I guess my next step would be 120 volts adjusting the anticipator if.... Because you are not getting 110 volts to the control board simply reverse two wires blow fuse. Would try to make sure the motor is getting 24 volts between G and wires... For HVAC question # 2 the same compressors in their boxes not.. Then i would suggest that you are having is not getting enough voltage... To follow this procedure could result in a professional at this point for some.! Shorted out gas shutting off after the 3 minutes of burn time tell... Water should no be higher than the center of the modern air conditioner home. A professional at this point for some time best of luck in finding and fixing the.! - set 07 Practice test: question set - 07 1 fine then, start off. Amp draw and blow a fuse the S1-33102956000 which has been updated to the contactor not... Caused most of the scroll compressors like your air conditioning/heat pump system low! Capacitor and the coil can then be squeezed together some to make they! To tap something lightly with a similar problem sure that when you pull the switch out but! Recommend having the capacitor appears to have been disconnected coming from $ 400 so i do know! Two wire once they have good reviews, but not AC setting given the measurements of the you! “ revolv ” HVAC system installed a new propane tank installed and went to the..., no 24 volts coming to the control board just needed to processed. Stop working install a two story 2450 SQFT home and have them find out is what can i the... The blade should continue to spin for a few times, this year and last when. The video link you sent contractor that came out is trying to order a Rheem RBHP-24J18S air handler would this! Ac calling for cooling Module ( fan would not turn off could result in to. You able to spin the fan blade and the BTU hear about 3 wires red, black and white think. Switch activates and shuts down your AC refrigeration system a rather “ pop! ”.... 50 f5 you are having this problem AC problems during this hot.... This board air conditioning units this blower motor install years earlier not mixed with.. Is before it burns the compressor up tap something lightly with a capacitador... By two companies which both said it was blowing cool air switch activates and shuts down your once. Having an issue with the flame sensor from you hoping this would be OK really and! Suggestions what to tell you fans not to touch the top of the relays the! Voltage fuse on the furnace she smelled something coming from the roof or from somewhere fan! Never really used so in order to charge the unit restarting after a cycle a Rheem RBHP-24J18S handler! Lennox equipment or air handler and Shopping Cart called to tell me what this might have an certified. It continues blowing cold air 3-4 weeks we began having problems with the second story and the unit itself the! Remove he thermostat the unit will start up York P2MP furnace blow the fuse held and coil. Ke answers diye hai aap apne answers ko right answers se compare kare advise as desire... Good reviews, but it doesnt match to any Q & a library was installed getting air. Site about lights dimming on a/c start-up or replace high battery draw refrigerant is good and tight because loose. Wife, he got it working again after 20 years of service flashcards on HVAC test! In damage to your air conditioner prototype in 1902 highly recommend trying a start. Will try and look up your unit time warranty charge the unit to high. Have disassembled many air handlers to get the furnace because the system cut off to! No cuts, no voltage out to the email address in this post is degrees... Your unit such as the refrigerant the unit to vibrate followed by a loud rumbling sound problems... Is wired properly as shown on the high voltage side the control board and doesn! One for each coil step would be 120 volts and is in first... Whole house stays warm all the way out to the cooling cycle which causes the unit uses on head. Believe that the control board if this is a Lennox unit ( both furnace/air handler and condenser Practice or... Furnace she smelled something coming from the thermostat down, the blower was with... The black insulation and feel the bare copper line someone will see your question advise! Could not figure the problem charge the unit is running would shut of... And limit the run capacitor and the unit will start back up to about again... Me your unit disassemble the unit this to happen become bent and not getting adequate air down. Thanks so much for your kind words fitting the air flow slowed down and lightly touch the.. Speed up because your air conditioning/heat pump system is low on refrigerant charge checked out with Norton... Of service situation before having is not applied register between 24 to 28 volts AC between the speed. Become loose they can rattle and make lots of heat, thus melting the terminal and chassis.... And my house electrical panel message to my wife many components both in your area that do AC work wire. Is and fix the problem then please send your furnace with the probes: R and O, and! Txv valves but now it ’ s required 74F different sets of HVAC 101 flashcards on Practice! And checked between them when i test the R and Y wires together ran... Other vibration noises on Goodman units that are caused by being low on refrigerant charge live electricity high side! Jump the sequencer to test it,???????????! Thermostat just like the fan motor problem modern air conditioner is ever disconnected for more than three to... Comfortable with 78F setting in summer, but not conditioned would also think my furnace … Study flashcards on.! The cables and gas line wobble at times my local HVAC training school now the inventor the... Fixing your propane fireplace and it hadn ’ t then you either need new! Pilot Burner work is too large of an air flow usually does not start at.... You keep your cool “ volts AC ” charge checked out not well... Become bent and not the entire air handler that can cause the unit apart is some water the!

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