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Defrost circuit board

Hello...a tech came out and jumped a wire on my carrier unit in the summer so we can get cold air. but now in the winter it gets frozen, and doesn't produce heat. Im buying a defrost circuit board tomorrow, but i just don't know which wires he jumped, so i can reconnect them. I just don't want to call the #$@%&@ back...If you know what I mean.

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He prob. jumped the reversing valve wire (usualy marked "O" or "B" on the stat and terminal board
(defrost board)

Posted on Jan 11, 2009

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I have a LG minisplit (indoor unit LSN122HE /outdoor unit is LSU122HE) it cools great dehumidifies also and has for 3 months of summer. However its cold now and it will not heat. It runs for a min out


That's an inverter series motors... the outdoor fan motor is on an ambient controller to maintain pressures when cold outside in air conditioning mode, but not in heat...only defrost when needed. Check the settings on the outdoor board for defrost timing

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Our a/c-heat pump unit was replaced for our home. This unit throws hot air in the summer and cold air during the winter. We have called service techs numerous times and no one seems to find the issue....


The issue is with the thermostat wiring. Depending on the heatpump, the Y1 wire is used to start the compressor, usually in the heating mode and the O wire operates the reversing valve, to bring on cooling. The crossed wire could be at the thermostat or at the unit. You likely have had techs that have little or no heat pump experience, this is a simple issue. Locate a good heat pump tech and have him/her fix it. Document the repair and send a demand for repayment from the ones that have been out. They need the education such a bill will bring them

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We have a Weatherking Heater/AC unit the heater works and the AC worked last summer when we tried the furnace this winter no heat found out it was the 24 volt transformer replaced it and heat worked fine...


I think you have a definite short and it's in the 24 volt circuit. The only problem is - 'finding a low voltage short' is not the easiest thing in the world to do - so - I would guess you'd need a Service Tech.

good luck!

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1 Answer

New unit just quit no compressor, no fan, breaker not trip, blower unit working fine


Remove the access cover from the outside unit. Find the contactor. It is the part that has the high voltage incoming wires attached. There is a button/bar in the center of the contactor. Use a insulated screwdriver or a wood pencil and push the bar in. If the unit starts you will have to trace the low voltage circuit from the thermostat and air handler to the outside. 24 volts should be present at the low voltage contactor terminals via the defrost board. If you have 24 volts to the defrost board,turn off the outside power, remove the red low voltage wire from the defrost board then reattach it. The board may be tripped on a low voltage fault.
Report back here with your result.

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1 Answer

Fan freezes up with ice in winter


They need air, do not cover it when in use.

If ti cools fine in summer then you just have a defrost problem.

Make sure the outdoor coil is clean.
If the coils are clean, then you have a bad defrost control.

In heat mode the unit should go into a timed or temp controlled defrost. If it is frosting up to the point of stopping the fan, in heat mode only, and otherwise operates properly, then its a bad defrost control.

It is reccomended that the defrost temp sensor be replaced at the same time the defrost control board is replaced. Some temp sensors are part of the board and not a seperate component, but not most.

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Replace the thermostat on your Heat pump, get the model number and search the net for a distributer. If that doesn't fix it, you'll have to call another serv tech, it could be that your defrost board is acting up.. Let me know for my info also, I'm curious as to what they find. Also, being a Contractor, I don't charge just to come out, I usually diagnose then tell the homeowner. Find a Contractor that will do this for you, if it's simple to fix yourself, he should only charge you partial serv call..

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You have a short somewhere in your system. It could be anything from a thermostat, thermostat wire or any component in your system. Honestly, you are better off calling a tech.

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