Wolf
Intake/Exhaust Icing or Extreme Condition Shutdown
Furnace shuts down during very cold weather and may restart after some time.
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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
Ice buildup on intake or exhaust termination, Condensate freezing in vent or trap on Wolf condensing furnace, Pressure switch not proving under extreme conditions
How to Fix / Troubleshooting
Safety: Do not use open flames to melt ice near vent terminations.
- Inspect terminations: Check outdoor intake and exhaust pipes for ice or snow buildup. Carefully remove obstructions and ensure proper clearances.
- Condensate freeze: Verify that condensate lines are insulated or routed to prevent freezing. Thaw frozen sections gently and correct routing.
- Vent configuration: Ensure vent lengths and fittings comply with Wolf installation guidelines to minimize condensation and freezing.
- Monitor operation: After clearing ice, restart the furnace and observe. If shutdowns continue, a technician should evaluate venting and pressure switch operation.
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Repair Difficulty
Medium
3/5
Required Part
Wolf Pressure Switch
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