Question about Frigidaire FAX054P7A Wall/Window Air Conditioner

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T-Stat issue?? or Compressor?

Seems the t-stat thinks its below 60 outside and does not go into "cool" mode or even when it is in energy saver the compressor does not come on.

all it does is pull in outside air... its about 85 outside.

Could this be a t-stat problem??

What else could cause this?

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Yes, the termostat and the main board will control the operation of the compressor. it could be the problem

Posted on Jul 31, 2009


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I have a Hampton Bay AC. It is 18,000 BTU. It is 230 volts. The EER is 9.7 and it is 8.3 to 9 amps. When I use energy mode on the AC it blows warm air. What gives? Just cool mode and it blows cool.

Hi Paul,
  • Energy Saver Mode most likely shutdown the compressor and Fan Only will be running to recirculate Ambient air into the room.
  • Make sure there is no Port or Vent that is open on your unit and would let hot air from outside be mixed in with the ambient air especially if it is hot outside.
  • Also refer to the troubleshooting section of your owner's manual.
Good Luck,

Jun 21, 2015 | Hampton Bay Heating & Cooling

1 Answer

A non programmable digital cheap thermostat indicates low battery. replace with new battery. still not cooling. is there a reset when replacing the batterly. can a low battery cause the system to stop...

No, The only thing you may loose replacing the thermostat battery's would be the time/date. All default pre-programming will not be lost. The thermostat controls the unit. If the unit is coming on then the t-stat is working. Confirm the unit is coming on when the T-stat tells it to.Turn the t-stat to the off position, have someone go outside to the condenser unit. Turn the unit on and listen for the fan and the compressor (2) different sounds from the unit. Feel the lines that connect to the house, the larger line should feel cool to cold and the smaller line should feel warm to hot. If you do not hear the compressor, or suspect it is not coming on with the fan, then you may have some other issue. In the heat we have been having one good suspect is a bad compressor start capacitor. The fan comes on but not the compressor,,this is a good indication the cap. is bad.. On the wall by your outside unit is a power disconnect. Open the box and pull the disconnect or flip the breaker to the off position. Now have someone turn the T-stat on and wait a minute then off and wait a minute, on and off ... you should hear a relay clicking on/off or in/out inside the control box of the A/C unit. When in the on position you should hear a slight buzzing sound also once the relay pulls in, this will tell you the t-stat is telling the unit what it should be doing. If all this is good then your unit is just is not cooling right and needs further troubleshooting. Hope this helps FixYa up.

Aug 18, 2011 | Heating & Cooling

1 Answer

Unit doesnt shut off. Even when I turn off the power switch it still runs. When in energy saving mode it does the same thing. I have to unplug the unit to get it to shutdown completely. ????????????????

Remove the cover to the thermostat to get to the control wires. Now remove the red wire from the stat. If it shuts off, the stat is bad. If it continues to run, the 24 volt hot wire from the stat to the unit is touching the cooling or heating wire somewhere from the stat to the control section of the unit. You can also disconnect the stat wires at the unit to prove this. You will need to pull a new set of stat wires to your unit, or if you have a extra wire not used , find the bare one that is touching, and use the spare wire in its place.
A/C, & Heating Contractor

Feb 18, 2011 | Heating & Cooling

1 Answer

We gave a Goodmn Hertz 60 Phase I heat pump - installed this summer....worked great for that temps are dropping we are needing heat. When we turn it on it comes on but never heats. Think it...

If you changed the unit but didn't change the thermostat it is possible that the thermostat that you have will not work with that unit. I see that the unit you installed is a heat pump, you may have a straight cool T-Stat. If you put the T-Stat in the "Auto" "Heat" mode the outdoor fan and the compressor should be workng as well as the blower fan. If it turns out that the outdoor fan and compressor are not running you will want to buy a Thernostat that is compatable with heatpumps should be 2 heat/ 1 cool

Nov 05, 2010 | Goodman PHKJ048-1 Air Conditioner

1 Answer

I switched my thermostat to save money but now it is 85 in my house and it constantly is running but it is hot all the time my dad put it in so i know its right what is wrong with it

It may be wired incorrectly. Make sure that the compressor is being called to run when you set the ac to cool. The Green wire to T-stat makes the indoor fan run when you set the T-stat to cool...also the Yellow wire should signal the contactor to engage at the outside condenser and compressor unit. If this is a heat pump system there is usually an orange wire that will signal the reversing valve to move when cool is being called....normally the reversing valve is in the heating position in the event there is a failure to the solenoid that actuates it..thus leaving it to fail in the heat mode to provide heat in winter weather as a default. Make sure the new T-stat accomidates for your units wiring.

Red wire to R (24v supply from transformer)
Green wire to G (indoor fan)
White wire to W (call for heat)
Yellow wire to Y (call for cool)
Blue or Black wire to C (common)
Orange also to Y if not specific to t-stat (calls for reverseing valve in cooling mode)

Oct 13, 2010 | Heating & Cooling

1 Answer

Heat pump heats with ac cool mode on dometic rv rooftop.

Sound like the change-over valve on the heatpump is not switching. Could be the valve is stuck, or bad. Or the thermostat is bad and will not send voltage, or is sending voltage to your change-over valve.

(Some systems energize the CO valve to cool, while others de-energize the valve).

Usually the color coding for the thermostat wires on a heatpump are orange and yellow. The yellow wire usually energizes the compressor contactor, and the orange wire energizes the changeover valve. Now depending on what your system does in terms of energizing or not energizing the CO valve to invoke heating or cooling mode is not known. You can try jumping across the thermostat to see if the CO valve is working. Or you can even try placing the stat in heating mode and see if you hear that loud "Woosh" when you switch between heating and cooling modes at the stat.

What often happens is the cylinder inside the CO valve gets stuck, especially if the system has sat off for an extended time. By workign the stat from heating to cooling (reversing the porting on the CO valve) will cause the valve to free itself up.

If you cannot hear that woosh as the changeover valve switches between heat and cooling, it is possible the CO valve is bad, or there is an issue in the electrical or control side of your system. Such as a bad base or switching circuit in your stat, or control issues other places.

Sep 03, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Heat comes on when the temperature setting calls for cool.

getting heat in the cooling mode leans toward the reversing valve in the outside unit. it changes the flow of refergerint so that the hot air you get outside in the summer is blown inside in the winter. another possibility is that the reversing valve isn't getting 24v check to see if you have 24v at O and C either at the t-stat, furnace, or the outside unit. if you check at the furnace rember the safty switch for the lower door if that switch is open you will have no power. i would look at the t stat first if you have 24v there go to the outside . 24v present outside will mean a bad valve or board, no 24v means a bad or broken conection in the control wire between the stat and the outside unit(usally the orange wire)

Jul 10, 2010 | Carrier Heating & Cooling

1 Answer

This goldstar air conditioner model is WG2405RY7 It has an energy saver, but the unit just keeps running and won't shut off, everything else works.

Doe's the temp reach the set point? If not then it will run until it doe's. If you set the stat warmer and the fan keeps running after compressor shuts off check to make sure it is in power saver mode. Most AC units keep more even temp when fan is left on.

Jun 29, 2009 | Goldstar M1003R Air Conditioner

1 Answer

Honeywell thermostat T8400c started flashing, heat/cool was off. Display flashes all icons (heat and cooling icons, temperatures, everything) and on the oppposite flash, the setpoint is displayed. The fan...

Based on the simplicity of this particular t-stat, I really think that it is bad and needs to be replaced. They do not make this particular model anymore. I have included a link to the operators manual for the stat. Good luck!

Apr 05, 2009 | Heating & Cooling

1 Answer

I have a carrier infinity system. On the thermostat it reads "sens error" where the outdoor temp is normally displayed. The inside unit is running but the outside unit is not. Any suggestions?

A burned or pitted contactor will/can cause a unit to not run. Outside fan. Just thinking out loud. Start with low voltage check at t.stat then check outside low volt. Set t.stat to on. If fan engages at least your transformer is good. Next set calling for cool. Drop t.stat 68-70. If nothing happens go outside and with a screwdriver depress the contactor in. If fan and compressor kicks in change the contactor. If contactor is pulled in check outside fan. Remove the wires from the compressor and see if the fan will run . If it does you have eliminated start components as good. The compressor has to be check. It needs to be ohmed out. Turn off power at disconnect. Pull the cover on the compressor. Check between pins; then pins to ground. Open or infinite is good.Have you checked fuses. Like small 3-5 amp fuses

Jul 03, 2008 | Carrier Heating & Cooling

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