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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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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

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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

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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...


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

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Outside unit wont go on ( central air conditioner)

Hi, yes when you hold down the contactor with a screw driver it will send high voltage to the unit and start up. What is happening is, on the lower sides of the contactor will be a 24volt coil, a wire to each side. You are not getting voltage to this coil for it to close the contactor on its own. If this system is central air with gas heat, you will have 2- small thermostat wires that tie to the 2- wires on the contactor coil. If its not gas fired, it will be a heat-pump with several wires coming from the indoor unit and thermostat. Either way, the 2 wires you need to worry about is the red and white or red and yellow for cooling coming out and connecting to the coil of the contactor, probably a blue and brown wire to each side. These are what closes the contacts on this. By using your finger it tells me you have high voltage there, that's good. If the indoor unit is running, the problem is either in the thermostat or the wires that come back from the outdoor unit to the indoor unit are not getting 24 volts. So, if the indoor unit runs, that tells me the transformer is good. Check the thermostat wire at the outdoor unit real well to see if it may have a break in the wires. If it looks good, go to the indoor unit and remove the control panel. There may be a panel switch on it that kills power to the indoor unit when removed and you may need to tape it down while you check things out. Just have it running when you pull the panel and if all stops, you will no.If it has a circuit board, look for a auto type plug in fuse 3 to 5 amp that may have blown. If you had a meter you could check the terminals at the 2 wires that head outside to start the unit for 24volts. If all looks good there, no broken or loose wires, go to the thermostat and remove the cover to expose the wiring. If its not a heat-pump and gas fired, you will have these terminals, RC, RH, with a red jumper wire across them, a G green for fan, Y yellow for cooling and a W white for heat.To see if the thermostat is to blame, take a piece of insulated wire and touch and hold it to either of the Red terminals and the yellow terminal. Have someone outside to watch the outdoor unit. If the stat is at fault, the contactor will close on its own when you jump the 2 terminals out. Make sure the indoor panel is in place first. I am almost certain this will be your problem since the indoor unit runs. If its a heat-pump, you will have more terminals at the stat. Still jump across the Red which is 24 volts to Yellow which is cooling. If the outdoor unit starts, replace the stat! This will solve the problem. Its just a matter of finding why and where you have lost the 24volt control voltage to the contactor coil to energize it, pretty easy if you follow my steps. It has to either be a broken thermostat wire at the indoor/outdoor/ or thermostat, or thermostat is faulty not closing R to Y to bring on the outdoor unit. Please keep me posted as I would like to know the out come. I am confident you can find the problem now that you know it is a 24 volt control problem not energizing the contactor coil. I will be waiting to hear back from you.

Jun 03, 2010 | Heating & Cooling

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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

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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

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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