E16
Weishaupt
Modulation / Gas-Air Ratio Fault
Unit shows E16; burner output is limited and water may not reach set temperature.
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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
Faulty gas valve modulation control, Defective fan speed control, Incorrect combustion adjustment, Blocked venturi or gas mixer
How to Fix / Troubleshooting
Safety: Combustion adjustments must be performed by a certified gas technician with proper instruments.
- Visual inspection: Check the gas-air mixer and venturi on the Weishaupt burner for dirt or insect nests. Clean carefully without altering factory settings.
- Check fan and gas valve connectors: Ensure both are firmly connected to the control board.
- Professional combustion check: A technician should measure CO₂/O₂ and flue gas values and adjust the gas valve and fan parameters according to Weishaupt specifications.
- Component replacement: If modulation cannot be controlled correctly, the gas valve or fan assembly may need replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas-Air Mixer / Gas Valve
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