US Stove No Response to Heat Call

Thermostat calls for heat but furnace does not start; control panel appears normal.

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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

Broken thermostat wire, Incorrect thermostat wiring at furnace, Faulty thermostat contacts, Control board not recognizing call

How to Fix / Troubleshooting

Safety first: Turn off power before working on thermostat wiring.

Steps:

  • 1. Verify thermostat operation: Raise the setpoint above room temperature and listen for a click. If none, replace the thermostat.
  • 2. Check wiring at furnace: Confirm thermostat wires are on the correct terminals and firmly attached.
  • 3. Bypass thermostat: Temporarily jumper the call-for-heat terminals at the furnace control board. If the furnace starts, the thermostat or wiring is at fault.
  • 4. Control board input: If bypassing does not start the furnace, the control board may have a failed thermostat input circuit and require replacement.
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Repair Difficulty

Medium 3/5

Required Part

Thermostat or Main Control Board
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