E16
Weishaupt
Weak Flame Signal
Boiler shows E16, ionisation current too low, intermittent flame detection problems.
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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
Contaminated ionisation electrode, Poor grounding of burner and boiler, Incorrect gas/air ratio on Weishaupt burner, Faulty ionisation cable or control input
How to Fix / Troubleshooting
Safety first: Isolate power and gas before working on the burner.
- Clean ionisation electrode: Remove and clean the electrode with fine abrasive pad. Ensure the tip is smooth and free of heavy deposits.
- Check position: Confirm the electrode is correctly positioned in the flame envelope as per Weishaupt instructions.
- Verify earth connection: Check that the burner chassis and boiler are securely earthed. Tighten earth screws and clean contact surfaces if corroded.
- Inspect ionisation cable: Look for cracks or burn marks. Replace the cable if insulation is damaged.
- Combustion check: Have a technician verify and adjust the gas/air ratio to ensure a stable, correctly sized flame.
When to call a professional: Persistent low ionisation current may indicate a control board issue or require detailed combustion tuning.
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Repair Difficulty
Hard
4/5
Required Part
Ionisation Electrode Assembly
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