A16
Hoval
Weak flame signal
Furnace indicates ionization current too low, intermittent flame loss.
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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
Incorrect ionization electrode position, poor burner grounding, low gas pressure at Hoval burner, partially blocked burner head.
How to Fix / Troubleshooting
Safety: Turn off gas and power before adjusting electrodes.
- Check electrode position: Compare the ionization electrode position to the Hoval service diagram. Adjust so it is well within the stable flame zone.
- Clean electrode and burner: Remove soot and oxidation from the electrode and burner head with a soft brush and fine abrasive pad.
- Verify grounding: Ensure the burner chassis is solidly earthed to the furnace frame. Tighten earth screws.
- Check gas supply: If other gas appliances are weak or failing, contact your gas supplier to check pressure.
- Reset and observe: Restore power and gas, reset the fault, and monitor operation. Persistent low ionization current requires professional combustion analysis.
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Repair Difficulty
Hard
4/5
Required Part
Ionization Electrode
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