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Transformer 47K20
This part 47K20 is compatible with:
- Product Type:
- Air Conditioner, Central Air Conditioner, Furnace
- Brands:
- GE, Lennox
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Transformer Customer Reviews
Common Problems Fixed by the Transformer
Based on customer reports and repair data, this part commonly fixes these issues:
Central air conditioner won't turn on
Furnace not turning on
Heat pump not cooling
Heat pump not heating
Heat pump won't turn on
Furnace wall thermostat not working properly
Air conditioner wall thermostat not working properly
Central air conditioner wall thermostat not working properly
Heat pump wall thermostat not working properly
Furnace not heating
Central air conditioner not cooling properly
About the Transformer
The furnace control board sends a low voltage signal of 24 volts to the thermostat. When the themostat cooling contacts close, a 24 volt signal is sent to the contactor coil, closing the high voltage circuit and sending power to the condensing unit components. Some furnaces have a separate transformer for the 24 volt circuit, so if the contactor is not receiving the proper voltage when the thermostat cooling contacts are closed, it's likely this transformer has failed and the component will need to be replaced.
Repair Help by Brands and Product Type
Alternative Part Number(s)
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