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Indoor unit runs continously changed thermostat unit still runs continuously heat does not come on

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Fan relay or fan time delay board is bad track wires from fan motor back to relay tap it gently and if motor goes off relay was stuck on. replace relay wire for wire , usually a 90-340 universal relay will work but you need to know how to wire it, maybe best to get exact repl and change wire for wire.

Posted on Oct 10, 2008

  • ERWIN Jun 07, 2012

    would you post how to wire the 90-340 relay step by step. it could be a big help to everyone.

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How to troubleshoot thermostat wiring?


I'm not sure if the thermostat is wired correctly. First, the thermostat is wired directly to the outdoor unit (compressor/condenser unit). It is NOT directly connected to the indoor unit. It connects to a low voltage control panel in the outdoor unit that sends a signal to your indoor fan/evaporator. This wire is called the fan relay switch and physically runs between the low voltage controls of the indoor and outdoor units. If the fan relay is bad it's possible that the unit runs continuously. To prevent destroying your outdoor unit there is a safety feature that prevents the indoor fan from shutting down while the outdoor unit is running. If the indoor fan did shut down while the outdoor unit was running than you would slug your compressor. That is, your compressor normally sees refrigerant gas but is instead seeing refrigerant liquid. That would not be good since this scenario would destroy your compressor. It sounds like a faulty fan relay. The actual contactor portion of the relay is in the outdoor unit.

Aug 22, 2014 | Honeywell Electronic Programmable...

1 Answer

Indoor fan will not stop


Seems like the fan relay has stuck (Likely to be on the main indoor PC board) or if the machine was being used on heating mode, the indoor pipe sensor may have failed causing the fan to continue to run. Most air cons on heating mode, will keep the fan running for a few minutes after you switch off on heating mode to cool down the indoor unit before it turns off completely. The pipe sensor signals the main PC board to tell it that the unit has cooled down and can now turn off completely. If either of the above faults occur, the indoor fan will keep running all the time.

Jun 19, 2014 | Goodman CKL36AR36 Air Conditioner

1 Answer

My Rudd air conditioner fan is running continuously.


Hello, if the outdoor unit is running continously then the contactor coil is stuck and msut be replaced. If the indoor fan is running then most likey the relay on the control board is stuck and the whole board will need to be replaced.

Jun 16, 2011 | Heating & Cooling

1 Answer

Hi. I recently installed 1.5 T, 3 * Split AC, LG. Whole day the AC works fine and no problem in cooling too. But once in 2 day outdoor unit start making thudding noise continously and does not stop for 4...


Hello

Sounds like the compressor is shuting down on high heat.There could be a couple reasons for this.
1 Check that proper voltage is being supplied to compressor.
2 Freon level may be low.This would be a service call.
3 Bad or intermitent connection at thermostat.
4 Main contacts to compressor sticking,usually burnt or pitted.

Apr 08, 2011 | LG Heating & Cooling

1 Answer

Indoor fan blowing cold air when on heating


The indoor fan will continue to run. When heat pump goes into defrost the outdoor fan stops, the reversing valve switches and the unit is basically working in the cooling mode. In order for you not to feel a blast of cold air in the winter the electric strip heat also comes on so the indoor fan must run while the strip heaters are on.

Jun 03, 2010 | Heating & Cooling

2 Answers

Unit fails. fuse in AH blown. continue to blow in heat or cool. unit 1 yr old any suggestions? all high volt checks OK


You have a low voltage short in the thermostat wires or the coil of a relay or contactor.
Best thing to do would be to remove all the wires to the outdoor unit (be sure to mark where they go... may only be 2 wires if you don't have a heat pump) and try turning the system on. If it doesn't blow the fuse, you know the short is between the indoor and outdoor units. Start hooking the wires back up one by one, that way, when the fuse blows again while you're putting the wire back on, you'll know which wire is shorted.
If the fuse still blows you will know it's in the wiring between the thermostat and indoor unit. At the indoor unit, disconnect all the wires to the thermostat except for the ones that go to R and C (these are the 24v wires). Now, with the thermostat calling for heat or cool, hook one wire up at a time starting with G, then Y, then W and see which wire causes the fuse to blow.
If it's G, it could be the thermostat wire or the fan relay. If it's Y or W, the short is likely in the thermostat wire between the indoor unit and thermostat. If that's the case, visually inspect the wire for damage and cut and splice if necessary.

Mar 23, 2010 | Heating & Cooling

1 Answer

Honeywell Thermostat


Make sure G from indoor unit goes to G on thermostat for fan continous fan, if that doesn't work and you have 24 volts to R and C then the t'stat is bad.
For 2nd stage heat or aux.heat, on the indoor unit you need to make sure the wire W2 from the indoor unit goes to W2 on t'stat.
You don't need any wires from W1on the indoor unit to W1 at the t'stat because with a York heat pump Y1 is the contactor which turns the compressor on and you will get 1st stage heat, and for cooling the t'stat will also bring on O which is the (reversing valve) or cooling changeover relay for the cooling mode.
C = common usually black wire
R = hot usually red wire
Y or Y1 = contactor
W1 = 1st stage heat not needed for heat pump
W2 = Aux. heat indoor heat
G = fan
O = Cooling changeover relay
B = Heating changeover relay
L = System monitor
E = Emergency heat relay

Dec 23, 2008 | Honeywell Electronic Programmable...

1 Answer

Indoor fan motor continue to run even if the thermostat is in auto position with the cool and heat switch in the off position. The furnance don't have a fan on and off switch in the furnance like most....


Try this, disconnect the fanwire (green) on the furnace, if it shuts off then the hot wire from the thermostat is touching the green wire or bad thermostat. Thank-you-very-much!

Aug 26, 2008 | Intertherm Heating & Cooling

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