Thermo Pride
Control Board Relay or Safety Circuit Open
Thermostat calls for heat but furnace only clicks and never starts inducer or blower.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open rollout or limit switch, Faulty Thermo Pride control board relay, Loose low-voltage wiring, Door switch not engaged
How to Fix / Troubleshooting
Safety First: Turn off power before testing continuity on safety switches.
- Check door switch: Ensure the blower door is fully closed and engaging the safety switch.
- Inspect safety circuit: Using a multimeter (advanced), check continuity through the rollout and limit switches. Replace any that are open and not resettable after correcting the cause.
- Check wiring harness: Verify all plug-in connectors on the control board are fully seated.
- Board replacement: If safeties are closed and the board still only clicks, the relay may be defective and require board replacement.
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Repair Difficulty
Hard
4/5
Required Part
Integrated Furnace Control Board
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