Keeprite
Failed Pre-Purge / Safety Not Proving
Furnace inducer runs but shuts off before ignition; this repeats without 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
Pressure switch not closing, Blocked vent or intake, Faulty control board timing, Loose wiring to safety devices
How to Fix / Troubleshooting
Safety: Turn off power and gas before inspecting venting.
Steps:
- Check vent terminations: Clear snow, ice, or debris from PVC vent and intake.
- Inspect pressure switch tubing: Remove and clear any water or debris; ensure tight connections.
- Observe LED codes: Note any pressure switch or limit codes and troubleshoot accordingly.
If the inducer never proceeds to ignition despite clear venting and good tubing, the pressure switch or control board may require professional testing.
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Repair Difficulty
Medium
3/5
Required Part
Pressure Switch
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