Auxiliary Sensor Fault

 

Cause: The safety is not making on the auxiliary device. This is terminals S1 and S2 on the AUX CONTROL relay on the CPC-3.

 

Solution: Inspect the auxiliary device and determine malfunction.

 

NOTE: Upon a call for heat, C and O automatically close to switch power to load. S1 and S2 must be closed by User-Provided Switch within 90 seconds to prevent alarm.