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Stacy CooperJul 29, 2025
What to do if an Interlock is tripped in my HydroTherm KN?
- GgibsonjessicaJul 29, 2025
If an Interlock is tripped in your HydroTherm Boiler, use a multimeter and check for 24 VAC on J11A, J11B to identify which interlock has tripped. Then, reset the Interlock or check for disconnected wiring or shorts. Alternatively, use a multimeter on J5 to check for 120 VAC on these interlocks (except the HIGH LIMIT). Note that the High Limit Interlock is displayed when there is no 120 VAC, since the HIGH LIMIT breaks the 120VAC to the Ignition Control. Also, check sensor voltages at J10A and J10B; the Temperature sensor inputs should be between 0 VDC and 5 VDC measured across the sensor. Finally, ensure the combustion air damper prove switch is wired across SPARE 1 and is a 'DRY' contact.
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