Genuine Lennox 56M61 boards are pre-programmed with the specific blower delays and ignition timings required for Lennox heat exchangers

check for a proper ground connection and clear the pilot tube of any debris

A failed switch can cause the compressor to run in dangerous pressure ranges or result in a total system lockout to prevent mechanical damage

Strict Voltage Regulation: Maintains a consistent 26

Watts 0121504 Valve Els PW 29614 Genuine Lennox 56M61 boards areThe Watts 0121504, officially designated as the LF174A 125 1, is a heavy duty, lead free boiler pressure relief valve engineered for high capacity protection in hot water heating and domestic supply systems. This 1 inch NPT valve is ASME Section IV rated, featuring a 3,215,000 BTU hr steam discharge capacity at its fixed 125 psi setting. Constructed with a lead free copper silicon alloy body, it ensures compliance with modern potable water regulations