E8
Eurotronic
Power Supply / Voltage Fault
Thermostat shows E8 and frequently restarts or freezes.
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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
Unstable 230V supply to thermostat, Defective internal DC power supply on PCB, Loose terminal screws on power input, Incorrect transformer wiring for Eurotronic low-voltage models
How to Fix / Troubleshooting
Safety: This involves mains voltage. Isolate power at the breaker and verify with a voltage tester before opening the thermostat or junction box.
- Check supply voltage: With a multimeter and power restored, measure voltage at the thermostat input terminals (by a qualified person). Confirm it matches the rating (e.g., 230V AC or 24V AC).
- Tighten terminals: Turn power off again. Tighten all power input terminal screws on the thermostat and any intermediate junction boxes feeding it.
- Inspect for damage: Open the thermostat and look for bulged capacitors, burnt components, or a burnt smell near the power supply section.
- Test with alternate supply: If using a plug-in transformer for a low-voltage Eurotronic thermostat, test with a known-good transformer of the correct rating.
- Replace thermostat: If E8 persists with a stable supply, the internal power supply circuit is likely defective. Replace the thermostat.
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Repair Difficulty
Hard
4/5
Required Part
Internal Power Supply Circuit
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