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and 3B electrode fittings
Regular maintenance involves inspecting the strainer screen at least once per year or when pressure drops indicate scaling or fouling
safety switch trips
Dual Power Flexibility: Reliable operation via C-wire hardwiring or dual-battery backup for installations where a common wire is unavailable
the KT10542 supports the precise air-to-gas ratio monitoring required for negative pressure valves designated with a "-2" suffix
Lennox 25W71 Gasket 320788-703 and 3B electrode fittingsThe Lennox 25W71 Gasket is a critical OEM replacement part designed specifically for sealing the collector box cover in high efficiency Lennox furnaces. As a veteran tech knows, a compromised seal at the secondary heat exchanger leads to pressure switch trips and dangerous flue gas leakage. This precision engineered furnace collector box gasket (also indexed under 100742 01) ensures an airtight, negative pressure environment required for the draft
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