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Lennox Contactor 21J03
This part 21J03 is compatible with:
- Product Type:
- Air Conditioner, Central Air Conditioner, Furnace
- Brands:
- Lennox
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Contactor Customer Reviews
Common Problems Fixed by the Contactor
Based on customer reports and repair data, this part commonly fixes these issues:
Central air conditioner not cooling properly
Heat pump compressor won't run
Heat pump won't turn off
Air handler not cooling properly
Heat pump not cooling
Heat pump not heating
Heat pump won't turn on
Central air conditioner compressor won't run
Air handler not heating
Central air conditioner won't turn off
Central air conditioner is noisy or loud
Heat pump is noisy or loud
Central Air Conditioner Condensing unit does not run
Furnace not heating
About the Contactor
The furnace control board sends a low voltage signal to the contactor. When the contactor receives the signal from the control board, it closes the circuit, sending voltage to the condensing unit components. If the contactor is defective, it will not provide voltage to the condensing unit. To determine if the contactor is at fault, use a multimeter to test the contactor for continuity. If the contactor does not have continuity, replace it.
Repair Help by Brands and Product Type
Alternative Part Number(s)
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