EHC
No Power to Control Panel / Dead PCB
Boiler display is blank but fused spur has power.
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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
Blown internal fuse on PCB, Faulty main PCB, Loose mains connector inside boiler, Faulty on/off switch (if fitted)
How to Fix / Troubleshooting
Safety: Isolate power before removing the boiler cover. Internal components carry mains voltage.
User checks:
- Confirm the fused spur is switched on and the fuse is intact.
- Check any external isolation switches are on.
Engineer checks:
- Verify mains voltage at the boiler’s internal terminal block.
- Check and replace any internal fuses on the EHC PCB with the correct rating.
- Inspect the PCB for visible damage; replace if no low-voltage outputs are present.
If the PCB is replaced, follow EHC commissioning procedures to set parameters correctly.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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