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My thermostat works fine when the air conditioner is running but it cuts off when the heat is turned on. There is a short white wire that is not connected to anything.

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Need more info. the unit running on cooling? then you turn it onto heating and it just sits there no fan going? white wire could be anything hard to tell .

Posted on Nov 09, 2010

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Have a goodman heat pump and air mover smelt plastic burning and cut tremostat off fan continues to run with a little warm air coming out with it off on thermostat


Hi, did you smell this plastic burning at the thermostat? The stat is only low voltage, 24 volts but may have shorted the fan contacts together causing the fan to run. The way to check is to take the first section of the stat off. Get to the wires coming in. Should have several since it is a heat-pump, but remove the red wire and tape or clip the bare end off. Turn on breaker back on. If the fan stays off, the stat is faulty. Make sure you buy a heat-pump stat. If fan keeps running, the problem will be in the main board/defrost board. It has shorted causing the fan to run and this is where the smell came from. You can sometimes remove the 4 screws to board and look at the back and if your lucky you will see the burned spot. Make sure the breaker is off first. Let me know. Good luck,
Shastalaker7
A/C and Heating contractor.

Mar 19, 2012 | Heating & Cooling

1 Answer

I turn on the power switch and the blower turns on and stays on. I can get the pilot light to stay on but the burners will not light even after I turn the RED gas valve to ON. There is no thermostat...


Hello Skyhalliday,

I understand that you are having a problem with you central heat/air. You do not have a thermostat installed and have the red and yellow crossed in order to make the unit run.

The wires you have crossed are not to the heat if they are to the common color code. Here is the color code for HVAC units:
Thermostat / Wire / what is controlled
W / White / Heat gas valve or heat elements
Rc(Rh) / Red / 24 volts transformer
G / Green / Fan
Y / Yellow / Air Conditioner Outside unit
C / Blue or Black / Common (energizes thermostats that do not have batteries)

You may not have the proper wires shorted in order to have the burners engage.

Thank you for choosing FixYa.com

Justin

Apr 04, 2011 | Heating & Cooling

1 Answer

Got a baxi back boiler about 20 years old works fine upto the other day when the heating is on the thermosate dos'ent seem to be working the boiler is just running on full all the time and not coming on...


Can you control heat with thermostat by turning it all the way down. I assume from your description that burner is running. If it is and turning t-stat all the way down made no difference I would remove t-stat from wall and remove red or white wires from it.This should cut power to gas valve turning burner off. If this works replace t-stat. Hope this helps. Thanks.

Nov 08, 2010 | Heating & Cooling

1 Answer

I have a Ruud air-conditioner/heat pump and it blows 5 amp fuse.


It sounds like the thermostat wire going to the condenser is ground, It either got pulled loose and is touching the housing or as in most cases the wire got cut or was chewed by an animal. You need to turn electric off to both devices and physically inspect the thermostat wire going from the air handler to the outside unit, also inspect where they connect inside the unit. When you find the break, cut and strip each individual wire and securely wire nut each conducter red to red white to white and so on. There you go all fixed. That's when I give you the bill for $75...except this time you write that check to yourself. Good Luck

Jul 14, 2009 | Ruud UBHC Air Conditioner

1 Answer

RV A/C COMPRESSOR RUNS CONSTANTLY


You must isolate the problem by disconnecting the thermostat wires that go to the unit. If the compressor does not run when the t-stat wires are disconnected, that shows that the t-stat is malfunctioning, or there is a short in the wiring between the t-stat and the ac unit.

If the unit continues to run after disconnecting the t-stat wires, then you'll have to look in the unit for a stuck relay

Jun 11, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

ELECTRIC HEAT STAYING ON IN COOL MODE


Disconnect the white wire from the "thermostat". If the strips stay on its your thermostat wires.

Apr 29, 2009 | Goodman CKL24AR24 Air Conditioner

1 Answer

Blower runs, Ignitor glows, no 24V at gas valve, no click....


Check the two wires coming directly off the transformer. They will be connected to the board the line voltage will be black and white and the 24voltage will be something like blue and red undo from board and check to see if you have 24 volts there. If not your transformer is bad 10 dollar part. Take it to Heating and Air parts house to replace. Let me know ken

Dec 13, 2008 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

Intertherm Heating and Cooling


I would say that you have ether a wiring problem or a faulty thermostat. The thermostat brings on the A/C through the Y terminal on your thermostat. The heating is brought on by the W terminal on the thermostat. If the wire for the A/C is shorting to the wire for the heating it would give the problem you are describing.

Jul 21, 2008 | Intertherm P3RA-048K Air Conditioner

1 Answer

Will not shut off


Sounds like a stuck relay on the unit itself. Maybe there is a short in the control wire that comes from the thermostat that activates the fan.

The thermostat probably has one hot wire at all times. The thermostat then chooses which wire to send the voltage down based on your selection. One of those wires is probably for the fan only. Make sure that it is in good condition (no bare, pinched or wires)

Jun 03, 2008 | Dometic Rooftop RV Air Conditioner

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