Lennox 59K21 Control Board Refrigerant Can this spring be used

Can this spring be used with LP gas

This is an SPST (Single Pole Single Throw) switch with a Normally Open (NO) contact function that closes on rising pressure

When diagnosing a furnace pressure switch error or a failed draft inducer motor

If you observe constant dripping or a steady discharge from the relief valve port despite the checks being clean

Lennox 59K21 Control Board Refrigerant Can this spring be usedThe Lennox 59K21 Control Board is a fundamental integrated ignition control module designed for high performance residential gas furnaces. As a high reliability "brain" for your heating system, this board manages the critical sequence of operations, including the furnace ignition control, inducer motor timing, and blower transitions. Technical data confirms that the 59K21 is identical to 59K2101, providing a direct OEM HVAC replacement part for