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Lennox XC21 Control Board
The Lennox XC21 control board is made to regulate everything including the gas valve, the ignition igniter, most sensors as well as the blower all in one unit. The HVAC system will be unable to run at all unless the control board is in connected and operational. It is imperative that you select wisely when choosing a control board because of the many variances of heating and cooling systems. The control board you choose will need to be a match with your existing board and be compatible with the brand and the model of your particular system.
Clues to watch for to know your control board will die soon
- The system board needs to be reset many times a day for the system to operate once again
- There is some sort of code showing up on the board
- Your HVAC unit cannot run well
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