ensure the board is correctly configured to the specific BTU and blower capacity of the unit to avoid error code 203

Ensure all gaskets are seated correctly during terminal block reconnection to maintain the integrity of the sealed combustion system

For larger motor loads

The kit contains the left and right blower housings

Common Questions & Technical Support: How do I verify if the sensor is functioning correctly

McDonnell & Miller TC-4 Valves THPU32HP7Y ensure the board is correctlyFor industrial boiler applications requiring precise low water cut off (LWCO) verification, the McDonnell & Miller TC 4 Test and Check Valves (Part Number 195000) provide a critical interface for maintenance and safety compliance. This 1" NPT dual valve set is engineered specifically for use with McDonnell & Miller controllers, allowing technicians to isolate the water column and simulate low water conditions without draining the entire system.