A18
Hoval
Condensate drainage failure
Furnace indicates condensate fault, burner stops, possible water in base tray
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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
Blocked condensate trap on Hoval condensing furnace, Frozen condensate discharge pipe, Incorrectly installed condensate siphon, Faulty condensate level switch
How to Fix / Troubleshooting
Safety: Isolate power. Condensate is mildly acidic; wear gloves and eye protection.
- Inspect trap: Locate the condensate trap beneath the heat exchanger. Remove and clean it, flushing out sludge and debris with clean water.
- Check discharge pipe: Follow the pipe to its termination. Ensure it is not frozen, kinked, or blocked. Thaw gently if frozen and improve insulation or routing.
- Verify water seal: Refill the trap with clean water before reassembly to maintain the seal.
- Check level switch: If fitted, inspect the condensate level sensor or float switch for sticking. Clean and ensure free movement.
- Reset and test: Restore power and reset the alarm. Observe for proper condensate flow during operation.
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Repair Difficulty
Medium
3/5
Required Part
Condensate Trap
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