Lennox 63W27 Ignition Control Board (100870-03)

Part Number: 63W27
Model Number: 100870-03
Brand: Lennox
Product Type: Ignition Control Board
Stages: 2-Stage Variable Speed
Voltage: 18–30 VAC
Frequency: 60 Hz
Dimensions: 8.125" H × 4.15" W × 1.85" D
Weight: 1 lb

Igniter Compatibility: Designed for use with the 95V igniter (100536-01) only. Not compatible with furnaces equipped with an 80V SureLight® igniter.

Common Symptoms of a Faulty Ignition Control Board

• Furnace will not start.
• Inducer motor runs but the ignition sequence never begins.
• Hot surface igniter does not glow.
• Burners ignite but shut off unexpectedly.
• Furnace repeatedly enters ignition lockout.
• Blower operates continuously without a heat call.
• No power is sent to the gas valve or igniter.
• Intermittent heating problems that become more frequent over time.
• Diagnostic LED displays ignition or control board fault codes.

In Alberta

Throughout Calgary, Edmonton, Red Deer, Lethbridge, Medicine Hat, Fort McMurray, and other Alberta communities, a failed Lennox 63W27 Ignition Control Board is commonly seen during the coldest months when furnaces operate almost continuously. Symptoms often include ignition lockouts, intermittent heat, or a furnace that refuses to complete its startup sequence.

In the Greater Toronto Area

Across Toronto, Mississauga, Brampton, Vaughan, Markham, Richmond Hill, Oakville, Burlington, Milton, Pickering, Ajax, Whitby, Oshawa, Aurora, and Newmarket, homeowners frequently experience intermittent furnace operation caused by a failing Lennox 63W27 Ignition Control Board, especially on older Lennox variable-speed furnaces that have seen years of seasonal operation.