Lennox 91J88 Control Board 320788-704 ensuring positive shut-off and preventing

ensuring positive shut-off and preventing refrigerant migration during off-cycles

The inverted flare connection and durable bracket design allow for drop-in replacement in compatible furnaces and boilers

Why is the external equalizer necessary on an 11-ton valve

Helps maintain stable microfarad (MFD) ratings to ensure consistent compressor performance

a 0-300 PSI range is optimized for high-pressure stages

Lennox 91J88 Control Board 320788-704 ensuring positive shut-off and preventingAs a seasoned technician, you know that a failing Lennox 91J88 Control Board is often the culprit behind intermittent ignition or irregular blower cycles. This ICM gas furnace control board is a high performance OEM replacement part designed to manage critical sequences, including ignitor warm up, gas valve timing, and inducer motor speed. Engineered for 120V and 24V applications, it integrates microprocessor based logic to ensure precise flame