Having problems with your Air Conditioners ?

Our system suddenly stopped...there was a thunder storm but now evidence of a strike. I thought it might simply be the thermostat since it was blank. I replaced it and now have a beautiful programmable thermostat but no A/C action. Was told to check relay as well as reset...The unit is at least 12 yrs old but really would like to hold off on total replacement for a while. Can you help with location and ID of relay and reset button if that's even accurate. I'm going to go out and start takin

Answers :

I have to assume that you have the thermostat hooked up correctly and it will call for cooling when turned down.
\015\012From your description of the problem it sounds like the power circuit should be checked first. Locate the breaker in the electrical panel box and make sure it is not tripped. Next find the disconnect (it should be near the unit). It will be a small black (usually plastic) box. Open the cover and pull out the disconnect. It is possible you may have a disconnect with a handle you have to move to off to open the box.
\015\012Go back to the electrical panel and move the circuit breaker to the off position. Lock and tag the breaker for safety. Using a DMM on resistance check the fuses for continuity. If you have continuity. replace the fuses, remove your lock and energize the circuit.
\015\012Move to the evaporative unit, the unit outside, and remove the cover over the control circuitry (it should be obvious). There should be a relay inside which turns on the compressor and another to turn on the fan motor.
\015\012With the thermostat turned up enough to be demanding cooling use a DMM on AC volts and check the relay for 120 vac. If none is present look for more fuses on the circuit board and test them for continuity.
\015\012At this point if the relay has power, but the unit is not running, the relay is your problem and should be replaced. Remember to turn off the power and lock it out before doing any additional work in the control section.
\015\012If the relay is energized and engaged, and has power to the compressor, then you probably have a bad compressor and will need to access the unit and check the current draw on the motor.
\015\012After removing the cover to the compressor check for voltage at the compressor motor. If you have voltage do a current check. A tag on the unit will give you the locked rotor current draw. If you read that amount then you need a new compressor. This is a complicated repair and requires a license and special equipment. You will have to have someone else do this.
\015\012There is also an outside chance that the start capacitor for the compressor which should be located on the control board is bad due to the lightning strike. If your unit is 12 years old I would just replace it. They are not very expensive. It will be a large silver can with three wires on it in the area of the control board. If you want to test it read the voltage across it. If it is bad the voltage will be low, if good the voltage should read 120 vac.
\015\012Let me know if you need more help.
\015\012Thanks for using FixYa and for the generous rating.

Repair Help & Product Troubleshooting for Air Conditioners
You need a second opinion or clarification ? ask it in the comment box OR you can Ask Your Own Question

Tips for a great answer:

  • Please provide as much detail as possible as this will allow our members to better understand and respond to your Comment
  • If you need clarification, ask it in the comment box
  • It's 100% free, no registration required

Suggested Questions/Answers :

It is recommended you read all this kind of situations

Our system suddenly stopped...there was a thunder storm but now evidence of a strike. I thought it might simply be the thermostat since it was blank. I replaced it and now have a beautiful programmable thermostat but no A/C action. Was told to check relay as well as reset...The unit is at least 12 yrs old but really would like to hold off on total replacement for a while. Can you help with location and ID of relay and reset button if that's even accurate. I'm going to go out and start takin

I have to assume that you have the thermostat hooked up correctly and it will call for cooling when turned down.\015\012\015\012From your description of the problem it sounds like the power circuit should be checked first. Locate the brea ... Air Conditioners

Blower fan stays running. Fan relay attached to small circuit board (coil tabs [timer?]). Capacitor on small circuit board had ''fallen out'' of ic board. Tried to get replacement board, and was sold just a standard relay - told that relay alone replaced the previous relay -and- circuit board configuration (?). Problem still exists (no change). Also changed thermostat just to eliminate as a possible cause, but seems like problem must be in the fan relay area. Question about the wires attache

... Carrier Air Conditioners

I need to obtain a typical manual pilot natural gas hanging shop heater wiring diagram. it is a totally 110 volt wiring configuration and has been wired for direct non-stop operation and i would like to install a line voltage thermostat to control the heater, but would like to verify that all safeties are in the configuration when i am through. there are a couple of visibility issues to the wiring so i need some help if possible. thanks

Put a 120v Thermostat in series with the power switch. No need to alter the unit.\015\012Hope this helps.\015\012Matt ... Air Conditioners

I have a DuoTherm BriskAIr 13.5K BTU. The Dometic thermostat also controls my HydroFlame 8531-IV furnace. This morning, the furnace would not come on. I checked the wiring and there is no voltage at the thermostat blue wire on the furnace. If I jump 12 volts to the thermostat blue wire, the furnace works normally. Replaced thermostat; no change. I hear something clicking in the air conditioner unit when I switch the thermostat to furnace mode. I assume the A/C has a relay to control the thermost

If you look at control box at roof unit, they usually use a separate set of wires for furnace. See what colors they are attached to at harness to thermostat. Some just follow other harness, and come out at thermostat. (bypass control box) Once you've ... Dometic Rooftop RV Air Conditioner

Want to replace a T874R1434 thermostat with aux heat with a visionpro th8000. Have a blue wire connected to the B terminal on old thermostat and what looks like a brown wire connected to the X terminal on old thermostat. Where would these be connected on the visionpro th8000 thermostat.

Its kinda difficult to know exactly what the wires could go to considering its all in the way the technician decided to hook them up and everybody has different ideas. I can tell you the most common use of the colors and see if that helps. Depending ... Ruud UBHC Air Conditioner

Honeywell central heat & air unit--wall thermostat not controlling it--will not work--thermostat only lights up -aux- and screen goes blank...worked previously...replaced relay and thermostat---still same thing. Why would the thermostat just stop working?

... Honeywell ER150B Air Conditioner

I have a carrier zonepack ducted reverse cycle split airconditioneer, model no: 38ZQ024. There is a honeywell T6060B1104 non programmable thermostat with it. I would like to replace it with programmable one. Which one would you recommend?

... Carrier Air Conditioners

I have A white rogers manual thermostat # 1F56-444 I would like to replace with A cheap white rogers programable thermostat. any suggestions? connections are rc rh G A Y ???maybe P

... Air Conditioners

Carrier 38CK036330 Hi,  I totally know nothing about air conditioning. It's getting so hot in LA and we really need help since our house has a 18-month old child. We have a Carrier 38CK036330 central unit, and it's not cooling the house as we'd like it to. It's already about 13 years old and we are looking for a new one to replace it. The question is we cannot find this model anymore, or do we have to replace it with the same model?? What model or brand would you suggest for a 1350 square feet h

The model numbers change.You have a 3 ton system.The make and model that you replace it with is not nearly as important as a quality install.Do your homework on picking a contractor that you can trust.Have them do a load calculation to make sure a 3t ... Carrier 38CKC060 Air Conditioner

I have a Coleman Evcon Air Conditioning Unit....for the FAU ...I have to remove both front panels and manually have to turn the fan to get the unit working...my question is....would this be some kind of problem with the relay between the thermostat and the FAU ? when I spin the fan blades by hand...it doesnt seem like it is rubbing...I have never experienced this problem...can somebody please help me??? I would truly appreciate it ! :)

Hi,\015\012\015\012As you rotate the fan blade it start workin.This is not a realy or thermotat problem.The problem is with the motor of the fan.Replace the motor and it will work fine \015\012\015\012Thank You ... Air Conditioners

Bryant FA4ANF04200 Operation is intermittent. Some of the time it will go on when set to heat or cool. Other times, it will not turn on. Replaced thermostat. Problem continues. Sounds like defective relay but where is it located?

Is this a heatpump system or a gas furnace /a/c system,you have a 3 1/2 ton a/c unit,if it is over 5 yrs old it could be a board problem,look for any spliced wiring where they used little wire nuts to join wires,these can make bad connections,?does t ... Air Conditioners

Thermostat is set too high, I would like to reset it to the factory default options or to a totally manual operation.

Wht is the make and the model no#? ... Air Conditioners

I have a 13500 btu ac dometic penguin model on pan that is old and would like to replace with 15000 btu ac of any other manufacturer or another dometic what are my options ..I do not have ducts and do not want heat, old unit was run without thermostat but wiring still exists

Your choices are another Dometic or a ColemanI prefer the Coleman But the amount of extra cooling you will get by stepping up to a 15K unit will probability not be worth the added cost ... Dometic Rooftop RV Air Conditioner

A Nordyne air handler, model B3BV-030K, with 4 wire thermostat. Thermostat and AC works fine in "cool". Switch it to "heat" and nothing happens.No fan, no heat.(I have built in heat strips -resistors). I jumpered (on the nordyne circuit board-input from thermostat) from R to W. (24 volts from R to W, which should start the heater. Nothing. No relay "click" like when AC comes on. If i jumper R to Y, AC comes on ok. Does this sound like a relay gone bad on the circuit board? Or what? If relay bad,

Do you get heat when you jumper R, G & W? ... Ruud Central System Air Conditioner

Honeywell t8601d showing a square symbol error - in past this has indicated low refrigerant. Tech came out, said need to replace thermostat, as compressor would not start, but if manually connected wires, compressor would start. So, had thermostat replaced. Tech then said need refrigerant. Did the t8601d actually need to be replaced?

There is a sensor that shuts the compressor down when the freon (refrigerant) is low. The tech probably "shorted" out this sensor. If the unit went on when he did this, the charge is low. ... Honeywell Air Conditioners


What I have always been told is if your 24 volt side burns out check the high volt side if the hi volt side burns out check the low volt side.A quick way if the primary side is burningout due to a problem with the low volt side:1 MA ... Air Conditioners

I am currently using a white rodgers 1F79 thermostat and would like to substitute a braeburn 3200 thermostat. The heat pump system is a amana Model GSH130241AA. The reason I would like to do this is that the Braeburn is programable. Thanks Bob

... Amana Air Conditioners

Borg warner Is the old round York Borg/Warner thermostat incompatable with a Honeywell? I just replaced my old round mercy switch thermostat with a Honeywell RTHL111 thermostat. The air conditioner service man says it is hooked up right, but the fan on the unit will not run on auto (it must be in the on position on the thermostat [thus the fan runs all the time]). He also replaced a relay switch inside the unit. We are using air conditioning only on this unit. Red to R (strapped to Rc), gree

... Air Conditioners

Remote thermostate Is it OK to replace the batteries in the remote thermostat with rechargeable batteries? This has been the most troublesome air conditioner we have ever had, and I think it is because of the remote. It is hard to keep the signal going from the thermostat to the air conditioner. Is it possible to replace the remote with a regular thermostat and if so what costs would be involved?

No,its not possible, what about manually control and forget the remote! ... Dometic Rooftop RV Air Conditioner

Penguin a/c The original Penguin A/C on my 1999 Airstream failed in August 2006, and the roof portion was replaced by an Airstream dealer. The replacement would not work with the existing thermostat, which was replaced by a thermostat designed to handle multiple zones, although I have only one zone. The combination operated irratically; it was often necessary to set the demand to 50 degrees to get the unit to start on a hot day. Once the unit was cool, any adjustment to a moderate temperature (

The multiple zone thermostat should work fine but sounds like this one has an internal failure try replacing the thermostat ... Dometic Rooftop RV Air Conditioner

Tech said that the Carrier equipment controller module board is bad. The house would heat when the digital thermostat did not call for heat in multiple zones. Quote was about $1500 to replace the board, replace the multiple zone thermostat with three thermostats in each area, and fix one duct. Sound about right?

Normally when the zone board is bad you only have to replace the zone board, thermostats should still be o.k. ... Air Conditioners

Hello, I have a carrier 58sta in the townhouse were renting. A few days after moving in the furnace was getting louder and louder each time we run the ac. It now sounds like a jet engine when it starts and stops. Also the thermostat will say its 80 and it feel like its 60 and it will continuously run all day. Other days it will feel like its 80 degrees inside and the thermostat will say 60 and it won't cool the place off. I replaced the air filter several times. I know the previous tenant before

The electrician might be able to help somewhat but an hvac tech is the person to call. It sounds like you have multiple issues if the thermostat is acting up that bad replace it!! but that wont stop the noise from the furnace thats either the blower ... Carrier Air Conditioners

Have a Payne pg8uaa furnace. Furnace only works when I run a jumper between R and W. Replace wiring to furnace. I suspect that the outside blower motor is the problem. When furnace is running the blower motor has a humming sound but does not blow air. At this point, I would like to know how you would diagnose a Tjernlund HSUL-J blower motor. Should the motor itself be replaced or should the fan prover be replaced?

You would have to test the motor as well as the capacitor on the motor capacitor goes for alot less then the motor though.here is the pdf manual on your blower h ... Air Conditioners

Rvp thermostat wont turn air conditioner off until it reaches 60 degrees, how will i know if its the thermostat or a relay

... Air Conditioners

Bryant High Efficiency Unit, runs constantly, I suspect the thermostat. Fan control and thermostat were replaced. The installer was to familiar with the installation. Could you please give me an idea of what could be the problem. Thank you for your assistance. The unit is over 20 years old. If replacement is required what would you suggest?

Any unit over 20 years is no longer energy efficient & it is past the lifespan of an AC. Get quotes from 3 different companies & go with best price with best warranty. I'm not partial to any particular manufacturer. They all get their part ... Bryant 462AJC021BA Air Conditioner

A detailed question is important to get you a relevant answers

  • Start your question with What, Why, How, When, etc. and end with a "?"
  • Be clear and specific
all rights reserved to the respective owners || ad-trader.net || Terms of Use || Contact || Privacy Policy
Load time: 0.0842 seconds