If the switch opens at 150°F

The York S1-025-26392-002 Rollout Switch is a critical safety component engineered for HVAC burner assemblies to monitor for flame rollout conditions

or high-voltage surges on the primary 120V line

Key Benefits Verified Compatibility: Exact fit for McDonnell & Miller Series 63 and E-28 low water cut-off assemblies

or mechanical handle failure

Nordyne 621679R Sequencer If the switch opens atThe Nordyne 621679R Sequencer is a critical 2 stage, 4 pole heat sequencer engineered for precise load management in Intertherm, Miller, and Nordyne electric furnaces. This authentic OEM Nordyne part is vital for preventing circuit breaker trips by staggering the activation of heating elements. By utilizing two independent control coils, it sequences four poles to ensure bank 1 energizes on the first stage call, followed by all four poles during a