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How can you tell if the circuit board in your AC heat pump is bad?
Wiki User
∙ 10y ago
On the board there is a R terminal which is usually the red wire and a common. Make sure you have 24v AC power to them even with the thermostat inside is turned off. This powers the board and defrost timer in the heat pump mode. After you've checked that turn the thermostat on in the cooling mode. Check voltage between Y1 and Common. You should have 24VAC. This means the thermostat inside is telling the outside unit to run. Keep in mind some thermostats and all defrost control boards have a 5 minute time delay. Once you have verified the 24VAC coming from the inside unit on Y1 and Common and the five minute delay has passed Check the Y1 out terminal on the board to common you should have 24 volts there as well if you do not then the board is bad as long as you have the 24 VAC between R and Common I mentioned earlier.
Wiki User
∙ 10y ago
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the amount of hot gas is not enough to change the form of all the liquids trap on it. By your question, I cannot tell of which component of the system you are talking about? It sounds like you are talking about (for a heat pump system) the outdoor coil? If that is what you are talking about, I would say that you have either a failed circuit board (most machines reverse the flow of refrigerant and stop the outdoor fan during defrost cycle). I would say that your reversing valve is either not energizing or is defective or your circuit board.
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