Lennox 25W90 Plate 30067439-890 Limit switches are safety-critical components

Limit switches are safety-critical components with specific temperature ratings defined by the manufacturer’s heat exchanger design

potential signal attenuation must be monitored to maintain the minimum required flame signal volts

If the relay contacts have fused closed due to an overcurrent event

Field diagnostics are simplified via the burner circuit test button

preventing air leakage and ensuring the stem returns to its fail-safe position accurately

Lennox 25W90 Plate 30067439-890 Limit switches are safety-critical componentsThe Lennox 25W90 Collector Box Plate is a critical replacement component engineered for high efficiency Lennox G40, G41, G50, G51, and G61 series gas furnaces. This secondary heat exchanger plate acts as the primary interface for managing condensate drainage and flue gas transitions within the condensing furnace collector box assembly. Manufactured with corrosion resistant materials, the 25W90 provides a precise seal to maintain required static