E10
Vokera
Hot water control channel fault / DHW relay or output error
Thermostat displays E10 and cannot control hot water function
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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
Incorrect wiring of DHW relay output at receiver, Stuck or failed DHW relay on receiver PCB, Misconfigured thermostat mode (CH-only vs CH+DHW), Faulty DHW demand signal to boiler
How to Fix / Troubleshooting
Safety first: The receiver at the boiler contains live mains. Isolate power at the fused spur before opening the receiver or touching any wiring.
- Check system type: Confirm whether your system actually uses the thermostat to control domestic hot water (e.g., with a cylinder and motorised valve). Many combi boilers control DHW internally and do not use a separate DHW channel.
- Verify settings: In the thermostat menu, ensure the system type is correctly set (e.g., combi vs system boiler with cylinder). Disable DHW control if not used.
- Inspect receiver wiring: With power off, open the receiver and check that the DHW relay contacts are wired correctly to the cylinder valve or boiler DHW terminals, if applicable.
- Test relay operation: Restore power and request hot water via the thermostat. Listen for a click from the receiver. If no click and E10 is shown, the relay may be faulty.
- Replace receiver: If wiring and configuration are correct but E10 persists, replace the Vokera receiver unit.
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Repair Difficulty
Hard
4/5
Required Part
Vokera smart thermostat receiver DHW relay
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