That is about all the advice I can think of if they can not make the access hole any larger. Brown marks on control boards indicate excessive heat which is caused most of the time by arcing. I would also suggest that you check for a loose fuse if the furnace is equipped with a fuse. I am afraid to leave it running and do any damage. This overheating could be caused by a dirty filter, dirty blower wheel, slow blower motor (could be a weak capacitor) gas pressure set to high on the gas valve, improper setting on the thermostat anticipator (if equipped), over-sized furnace (too big for your home or duct work) or a stopped up evaporator coil. A good cleaning once a year might save someone a few bucks and it might be a solution to some of those dual fuel heat-pumps not lighting or staying lit .. If you do not have a heat pump and the fan is cutting off then I would suggest checking the fan motor capacitor to make sure it is not weak and in good shape. It has started short cycling. If you aren’t getting 24 volts between G and C then you might have a thermostat problem. If you are not getting 24 volts between R & C then you must have a transformer problem or a blown low voltage fuse on the board. If you hear your contactor chatter then please find out what is causing the low voltage problem soon, because this chatter will cause a contactor to fail soon. Steve & Barbara Arnold, Please click here to see the transformers we sell. I hope you can easily find out what the problem is. I notice in another unit somebody put an extra switch with a 2nd capacitador. I would make sure you have a filter installed that is not too restrictive. HVAC Test Questions. I hope you get this fixed soon. 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 hope that your furnace was installed according to manufacturer’s recommendations. I would suggest calling the company that did the bad work and ask them to replace the unit free of charge. The liquid inside the compressor can cause the valves inside the compressor to become bent and not sell anymore. I had a capacitor replaced for each of my Air Conditioning units. National Trivia Day: HVAC Questions and Answers. Most of the time the sequencers are used to energize heating elements and to start the blower motor, but not connected to the contactor in anyway. Is it the thermostat going bad and eating batteries, or is there something more? Note: The Fan on / auto switch does not work on the Honeywell Thermostat Controller. The power management box on the side of the house shuts off power in less than a second. Here is a list of some common HVAC questions that users of air conditioners or heat pumps asked regarding their equipment. Hi Ms. Marino! If you want to send me the unit’s product number I will try and look up the part number for the relay. I am thinking I may have to put in a relay with a separate voltage source to fan motor but would prefer to use existing control system. I paid one of them to change the transformer on the furnace to 24 volt. These brackets help hold the heat exchanger in place and it they become loose they can rattle and make lots of noise. the Tech guy gave me the old ones and told me not to touch the prongs. The thermostat was set to “cool” but warm air was coming from the vents. Sometimes inspection does not show the short and you would need to take the wires loose from both ends and test with an Ohm meter. Failure to follow this procedure could result in damage to your air conditioning system”. Steve. We have a page dedicated to “How Do I Discharge a Capacitor” https://arnoldservice.com/problem-discharge-high-voltage-capacitor/ I have never been shocked by a capacitor, but I know guys who have been shocked and it is an uncomfortable feeling! Pull your high voltage disconnect so there isn’t a chance of you getting shocked. Steve, Thank you very kindly for your timely response which is very rare no a days. I now have a new system with a V.S speed fan and 24v control. Hope you have a nice weekend! I would think that 90 would mean a good ignitor. Your email address will not be published. However, my HVAC control board was fried and we lost our AC. The old one was a 2 zone system with upstairs and downstairs being controlled individually. I would suggest that you use a volt meter and test with the thermostat set to call for cooling between the C (com) and Y (yellow) connections on your thermostat. Does lumber sound right for this application? Another idea would be to only replace the evaporator coil and not the entire air handler. We’ve been having issues with our unit. Copeland makes many of the scroll compressors like your unit has in it. It’s a Nordyne 903758 and it’s gotta be about 15 years old. We bought a house last August and the air conditioning was working fine, though the unit is about 10 years old. Please advise. Any suggestions? I would suggest testing to make sure the “G” connection (24 volts between the G and C com) on the thermostat is being energized when in emergency heat. I hope this helps you out. 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. The gauges will show whether the unit is low on charge, has a bad valve and whether or not the compressor is working properly. this Goodman unit is 2 years old… So I checked the thermostat, no 24 volts to the outside. We have a troubleshooting flow chart that I hope will help you out on the following page: https://arnoldservice.com/furnace-trouble-shooting-flow-chart/ I hope you can easily find and fix the problem. 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! On our furnace the control board and draft inducer are real expensive over $250 each. Your email address will not be published. Heat Transfer Quiz Questions ; Ozone Layer Depletion Quiz ... Condenser Basics Quiz Questions; Boiler Basics Quiz; HVAC Heating Basics Test 1; HVAC Heating Basics Test 2; Cooling Towers Quiz Questions; Cooling Towers Quiz Questions 2; God bless you and your family today and always! Sorry that I can not help. I was told it was a 50-50 decision on my part to either repair or replace. the most important part of the question. Home; HVAC Basics. My outside compressor fan gets hung up every once in awhile after being away from my home for a few weeks. Wondered if this sounds right to you too? I can not find a Lennox parts supplier here in Louisville, KY. where I can call for information and purchase parts. One night I noticed only the blower was running with no heat coming out of the vents. They are replacing air handler in attic, coils, etc. You’ve given me a wealth of great information, Steve, you are the Man, I can’t thank you enough! Hi! Any suggestions on what to have check or some issue suggestions as I do not want to be away for months with the AC not running to keep humidity levels respectable. Hi Victor! Steve. This is what causes the fan relay on the control board to close and runs the fan in the cooling mode. You could also try disconnecting the Y wire from the thermostat and see if the unit outside stills runs. a) From inside the chamber where the gas would enter the Pilot Burner and the brass fitting screws in, I blew out the Gas Nozzle and the little cone nipple that the compression fitting sits into. They are phasing out R22 units so you will need to replace both the outdoor unit and the evaporator coil with new equipment using the new refrigerant R-410A. This sounds like a thermostat problem or some thermostat wires that could be shorting out and causing the unit to start on its own. You can check that by pulling the top of the switch out of the T fit ting. If you have a high efficiency ECM blowe motor then I would leave this to a qualified tech to check the motor out. If I leave the system on, in about three or four minutes the compressor starts back up, but the fan stays off. Yes, The blower wheel could be dirty or off balance and cause a rumbling sound. Steve, what causes the compressor terminals to burn, Hi! Hi Tina! This can be a dangerous condition because when all the burners do not light it can cause raw gas to go up into the heat ex-changer and cause lots of black soot to form and stop up the heat ex-changer so the furnace does not vent properly. I hope you can easily find and fix the problem. Hi! I think it’s a high voltage fuse? After the first 3-4 weeks we began having problems with the outside fan and unit shutting down. Sorry to hear that you are having this problem with fitting the air handler into your attic. This sounds like your air conditioning/heat pump system is low on refrigerant charge. I have a Sensi Wi-Fi thermostat and love it. I had some siding replaced near my ac unit, and when they removed the disconnect, they shorted out the breaker. I am sorry, but I am afraid to advise you on this. 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″. 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. The fan on the unit wasn’t running. I always liked troubleshooting electric furnace’s with an amprobe which shows the amps running through the wires by just clamping around the wires. Yes, if you have high head pressure and low suction pressure then you probably either have a stopped up cap tube, bad TXV valve, dirty condensing unit or a slow condenser fan motor. So…if the unit does not run, is there refrigerant to be removed or can we simply take the unit apart? All of them told me basically that my problem was a direct result of this blower motor install years earlier. 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. If you do not find anything then you might try a new thermostat. What might be the problem? So in order to run the 1.34 horsepower pump you would need 556 square feet of solar collectors. Created by. Study Flashcards On HVAC Practice Test Questions at Cram.com. The duct work inspected by two companies which both said it was fine. I hope you can easily find and fix the problem. Steve, Replace expansion valve on evaporator vacumn unit started charging unit had 150 on suction line turned unit on pressure dropped to 20 suction line frosted up unit shut off unit won’t run long enough to charge 410-a system, Hi Mr. Vuorela! I hope you have a nice day! Please make sure all thermostat wires are good and tight because a loose wire can cause high amp draw and run your batteries down. Terms in this set (21) You are the refrigeration engineer running a 2000 - ton centrifugal refrigeration system. All good. You might want to make sure the capacitor is in good shape by having it tested at a local appliance parts store. Thanks for asking this question. Hi Mike! I hope the compressor was not slugged out and hope it did not bend one of the valves. Hi Keith! I am sorry that I do not know the answer to your questions. I would try to contact the manufacturer of the thermostats and ask them if it would harm the stat if they receive 27 volts. Can a weak capacitor case this to cycle on or is it likely a control board… or something else? 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. I hope you can easily find and fix the problem. My central ac unit blower fan is making a rumbling noise. works perfect during the night or on a cloudy or cool day. Hi Jerry! I have a question. 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. I went to the thermostat and it did not indicate the unit was on. Inside and outside ciols aren’t clogged. I would suggest that you call an HVAC company and have them clean and inspect your furnace. If the furnace is not installed according to the manufacturer’s recommendations you might start having trouble with the pressure switch not allowing the furnace to operate and the furnace will lock out. My HVAC guy said the head pressure was too high so it was shutting itself down until the pressure stabilized then came back on. I would make sure that your thermostat wires that go out to the unit are in good shape and not broken or shorted out. Listed below, are frequently asked questions related to Heating, Ventilation, and Air Conditioning. Steve. HVAC UNIT 12 Flashcard Maker: Mauricio Bermudez. 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. Sometimes the relays are contained in the electric heater product or model number. 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. My furnace still locks out occasionally. I have a 93% efficient furnace but when changing a breaker the return wire became caught against a 20amp hot line. Overall, very unpredictable (not cooling well when outside temp goes up). Here in Louisville, KY all outdoor units must have a disconnect box so a service person or homeowner can easily disconnect the power to the outdoor unit. Hi! 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