E20
Weishaupt
Safety Chain Interruption (Limit Switch / Safety Loop Open)
Unit shows E20; burner stops and will not restart until reset.
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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
Open safety thermostat, Tripped flue safety device, Loose safety loop wiring, Faulty safety relay on control board
How to Fix / Troubleshooting
Safety: Do not bypass any safety devices. Identify and correct the cause.
- Check manual reset devices: Locate any manual reset safety thermostats or flue safety switches on the Weishaupt heater. After cooling, press the reset buttons if present.
- Inspect wiring loop: Follow the safety loop wiring between thermostats, pressure switches, and the control board. Look for loose or broken connections.
- Identify root cause: If a safety device has tripped, determine why (overheat, blocked flue, pump failure) and correct that issue before resetting.
- Professional diagnosis: If E20 persists with all safeties closed, the control board safety relay may be defective.
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Repair Difficulty
Hard
4/5
Required Part
Safety Thermostats / Safety Loop Wiring
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