Learn hvac 101 with free interactive flashcards. I am sorry, but I have never heard of an R26 250 volt fuse. This sounds like the furnace blower might be too strong for the air conditioner that was installed. Test yourself to see how much you know about the indispensable air conditioner. Please make sure the motor is wired properly as shown on the motor label. Steve. If the air coming out of the vents is not cool I would suggest hooking up gauges to the unit and see if the compressor is pumping or not. The unit is installed in the attic and when it vibrates you can see the cables and gas line wobble at times. Gravity. the furnace made a humming sound then a pop. The next day I climbed in the attic to check things out but didn’t notice anything out of the ordinary. Our Carrier parts program shows that this furnace has a blower motor part number: HC37TQ113 which is only a 1/5 horsepower motor. Test. When the compressor motor windings melt this contaminates and produces acid in the system. Sorry to hear this happened. We have several different free HVAC general practice tests complete with questions and answers. Or do you know of any other options? On the high voltage side the compressor and fan motor. Had this problem for 6 years. Best of luck in finding and fixing the problem. What should I ask the installer to check? Steve. HVAC Test Questions. The current decibel reading when running 70-78. I would suggest making sure your refrigerant charge is right. The model number should be located inside the furnace near the burners. Hi Cathy! Some of your duct work must be disconnected or having a heat gain from the roof or from somewhere. I would recommend looking at the flame sensor and ignitor and see how difficult it would be to replace it before ordering. What I learned was that this well-known, established company, who had replaced my “outer blower motor” 5 years earlier had removed a wiring protective tube (that came with my unit) where the 220v wires were supposed to be run – and had directly zipped tied them to my copper discharge tube. 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. Thanks Steve. The system supplies chilled water to a college campus with multiple buildings. The vibration at times is excessive. You could also try disconnecting the Y wire from the thermostat and see if the unit outside stills runs. Test your knowledge for National Trivia Day! You have already completed the quiz before. Do take this quiz and see what you know about heating and air-conditioning You must sign in or sign up to start the quiz. If you aren’t getting 24 volts between G and C then you might have a thermostat problem. If you wife did not feel an electrical shock then the capacitor must have been discharged and there is nothing to worry about. I went to the thermostat and it did not indicate the unit was on. Hi, I recently had a Rheem direct vent furnace installed with 2″ PVC with an approx 30′ run to exterior. Steve Arnold. I have never used the AC Renew, but I have seen many of my suppliers selling it to prevent sticking TXV (thermostatic expansion valve) problems. We discuss this problem on the following page: https://arnoldservice.com/problem-your-fan-on-your-furnace-runs-all-the-time-and-will-not-shut-off/ I hope this helps you find and fix the problem. God bless you and your family today and always. If I turn the furnace off and then on at the furnace. Whatever it is, it is temperature related. This insures you get the right sized equipment installed. I hope you get this worked out soon where you are treated fairly. Solution for HVAC Question #1. My question is what can cause the unit to vibrate and at times excessive vibration? A compressor hard start booster might help this situation. 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. Steve. I just replaced the motherboard. Sorry that I can not be of much help. After the unit runs for 10 to 15 minutes the line should feel like a cold coke can right out of the refrigerator. they look at other spaces in the attic but determined that there was no other spot that they would be able to cut open a hole large enough to get it in the attic. I feel that scroll compressors are about the best you can get. If your electric furnace or heat pump is not having any heat come out of the registers it is probably a sequencer, control board or limit that has gone out. I’ve also replaced the fuse on the furnace board, and it doesn’t make a difference. We had some renovations done to the house between September and December, including relocating a few HVAC ducts/pipes, and a little bit of electrical. Hopefully the fuse is blown on your control board and it did not burn the control board up. Again, on the salt treated lumber I would check with your local HVAC code enforcement to see if this is allowed. If these are all closed and you are not getting 110 volts to the ignitor then you might have a control board problem. Hi Mr. Longmire! You might look at Angie’s list in the reviews and see who other people liked in your area that do AC work. Make sure the drain line stays unplugged. Hi Tina! I hope the tech can easily find and fix the problem with your furnace. Hi, I have a International Comfort Product (ICP) HVAC system installed a little over a year ago. HVAC.com is home to a comprehensive Contractor Directory that connects you to local HVAC contractors who can answer all the AC questions specific to your home. They recommend waiting three hours to make sure all the liquid refrigerant is boiled off. Are you able to tell me what this might be? We have a troubleshooting question and answer page which has many questions with YouTube troubleshooting videos on the following page: https://arnoldservice.com/air-conditioning-heat-pump-troubleshooting-questions-answers-index/ I hope you can find and fix this problem easily. I called my Bryant Carrier supplier and they said that you could install the two stage Carrier AC with a single stage furnace, but the AC (outdoor unit) should only work on one speed. Hence you can not start it again. If it doesn’t then you are low on charge and need to get a technician to find the leak and charge it up as quick as possible. window._mNDetails.loadTag("675562411", "300x250", "675562411"); If it isn’t the thermostat then I would suggest testing other safety controls like the limit or pressure switch (if equipped). Click here: Troubleshooting Heating Problems, Propane furnace not working when temperature got down below freezing. Most of the time compressor terminals burn because of a loose connection caused by the vibration from the compressor, moisture from rain or from a sweating compressor. I have seen compressor blown up when lighting strikes. It even does it with the thermostat turned to the off position. I would ask your contractor to look for an air handler that can be disassembled in pieces then reassembled in the attic. If it were me I would suggest keeping an ignitor and flame sensor the least expensive parts. I am sorry, but I am afraid to advise you on this. Hello. Steve, Question: We bought a place and there was a note that stated to turn the a/c breakers off when switching to heat. I always liked troubleshooting electric furnace’s with an amprobe which shows the amps running through the wires by just clamping around the wires. The problem now is that the burners are not glowing before the gas kicks in and the blower engages, so I get no heat. I hope you can get this company to take care of your problems. When I test the R wire to the C wire, I get nothing on the volt meter. I definitely have 24 volts leaving the low voltage transformer and feeding the board. Hi Mr. Longmire! This sounds like your compressor is probably over-heating and going off on internal thermal over-load protection. I remember I had trouble where I installed too small of pipe (2″) and I had to go back free of charge and replace the 2″ pipe with 3″. I hope you can easily find and fix the problem. Could I go ahead and use the gas valve without the flex hose or should I scrounge the internet for my original gas valve? Hope you have a great day! I learned alot from my mistakes and I never want to make that mistake again! If this does not fix the problem then you could have a short to ground in the defrost board, reversing valve coil or contactor. Hi John! 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. The most common cause most of the time is because the system is low on refrigerant charge. If the compressor is hot on the top then you might be low on refrigerant charge. i did not get an explanation from the tech what are the consequences and what are my actions when that happens. If you tie all these wires together and nothing works then sounds like an electrical problem (maybe thermostat wires) or yes, it could be the control board. NOT sure) Not a constant on and off. I would suggest checking your low voltage at the control board. The new digital thermostats do not have an anticipator setting but have batteries. It’s 3.5 ton and services a quad-level home. This could be 24 volt power or 110 volt power. 630 PSI is way too high! If it doesn’t then you might need a new blower motor. Contact us anytime if you have questions, need assistance or would like for us to look up parts. Hi Mike! Steve Arnold, On a RUDD heatpump with the entire unit on the outside. This can cause the compressor to run high head pressure, over-heat and turn off and on while you are away on thermal over-load. everything is now NEW.. still no low voltage to outside… noticed that one of the wires on the double stack sequencer was a little dark, the thermostat still is working, fan cycles on heat, cool, and emergency, elements are heating, just still no compressor, or heat pump.. could a sequencer be my problem?? Hi Victor! This sounds like you either have a fan motor problem or possibly a fan capacitor problem. Steve. If some reasons we may want to stop the hvac for some time (minutes or hours), how much time should I stop… Few days back we noticed water leaking from hvac, our maintenance people said that, u should have to run your hvac continuously. I hope you can easily find and fix the problem. Cram.com makes it easy to get the grade you want! This is what causes the fan relay on the control board to close and runs the fan in the cooling mode. Usually variable speed motors have dip switches that you can set for different amounts of air flow. So if you have a heat pump then what you heard might be normal. The gauges will show whether the unit is low on charge, has a bad valve and whether or not the compressor is working properly. Yes, this is true. – Sam, Hi Sam! Now the outdoor fan will start briefly but the compressor does not. I was then told by an inspector that it needs it to be 3″ not 2″ PVC. It wasn’t very old and had few hours of usage . i installed a new revolv hvac system about 6 years ago and the blower has always been loud.do you think the fan blades are wrong.the old unit was not as loud as the new unit is. Thanks so much for the great question! Thanks for asking this important question! I’ll keep poking away. Now we feel poor/weak airflow from most of the vents. Is this something that truly can be done? Two heating companies and Propane company could not figure the problem out. I find that if I take the control box off, jump connections 5-6 and manually get the motor started, then I can have a hot shower and some heat in the house. Sorry you are having this problem on this hot day! Please make sure the contactor is getting at least 24 volts AC to the coil. If you aren’t getting 24 volts between these two terminals then you might have a thermostat problem or a thermostat wire problem. Great quiz! I have been told that a compressor is matched to the condenser and the evaporator coil and that the compressor should be replaced with a Carrier authorized part or the system may not perform as expected. If the contactor is not getting the needed 24 volts then this can cause the contacts to chatter and burn up quick! Thanks Arnold. 10108. We have one of the Best in Website Security with a Norton Symantec Secured Website and Shopping Cart! Steve, what causes the compressor terminals to burn, Hi! 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. I hope you can easily find where the rumble is coming from. I am sorry, I do not know what the problem with your heat pump is. 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