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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You should always include model number in requests. More info is better. In general, there is a setting for Heat and cold on cheaper thermostats. Mine is like that. It works for heating in winter and you must switch it to "cool" for summer. I assume you do have an AC unit for summer. Who wired it up? was it ever working? Did it get installed during winter? The wiring may be wrong, there are a lot of possible ways to wire. If you are not good at that (and why would you be here if you were?) better get a tech to check it out. In the old days, Edison might send out a tech for free to advise (not fix) if there is a possibility of short (dangerous).
Look on the circuit board for a small fuse. Replace if necessary. take a small piece of wire and with the door safety switch taped down, jump out R and W terminals on circuit board. Unit should power up. You can also jump out R and G terminals and room air blower should turn on. If nothing, replace circuit board.
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
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.
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.
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..