Worcester Bosch
Thermostat power loss
Thermostat display completely dead; no backlight or response to buttons.
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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
Flat batteries, Loose low‑voltage power connection, Failed internal power regulator, Damaged display PCB
How to Fix / Troubleshooting
Safety first: Work only on the thermostat and its low‑voltage connections. Do not open the boiler.
- Check batteries: Replace all batteries with new alkaline cells. Ensure correct polarity.
- Check wall plate connection: Remove the thermostat and inspect the contact pins and terminals. Clean gently and re‑seat firmly.
- Low‑voltage supply: If the thermostat is mains‑powered via a transformer, verify that the transformer or 24 V supply is on (this may require an electrician).
- If still dead: The internal power circuit or display board is likely faulty. Replace the thermostat.
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Repair Difficulty
Medium
3/5
Required Part
Smart Thermostat Assembly
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