Philco Stuck Relay or Pressure Switch Fault

Furnace inducer motor runs continuously even when there is no call for heat.

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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

Stuck inducer relay on control board, Shorted thermostat wiring, Pressure switch stuck closed, Faulty control board logic

How to Fix / Troubleshooting

Safety first: Turn off power before inspecting wiring or the control board.

Homeowner checks:

  • 1. Check thermostat: Ensure the thermostat is not calling for heat. Turn it to OFF and see if the inducer stops after a few minutes.
  • 2. Inspect thermostat wiring: Look for shorts between R and W at the furnace control board.
  • 3. Power cycle furnace: Turn power off for 5 minutes, then back on. If the inducer starts immediately with no call for heat, the control board relay may be stuck.

When to call a professional: A technician should test the pressure switch and replace the Philco control board if the inducer relay is welded closed.

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Repair Difficulty

Hard 4/5

Required Part

Ignition Control Board
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