E5
Drayton
Relay Drive or Output Fault
Thermostat shows E5 and cannot control heating; relay in receiver does not click.
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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
Failed relay on Drayton receiver, Burnt relay contacts, Faulty relay driver transistor on PCB, Overload on switched live output
How to Fix / Troubleshooting
Safety first: This involves mains voltage. Turn off power at the consumer unit and verify with a tester before opening the receiver.
- Visual inspection: Remove the cover of the Drayton receiver (e.g. Wiser Heat Hub, Digistat RF receiver, SCR). Look for signs of overheating or burning around the relay area.
- Check load wiring: Ensure the switched live output is not shorted to neutral or earth. Inspect wiring to the boiler or zone valve for damage.
- Test relay operation: With power restored briefly and covers in place, command heat from the thermostat and listen for a relay click at the receiver. If no click and E5 is shown, the relay or driver is likely faulty.
- Replace receiver: Drayton receiver PCBs and relays are not generally field-repairable. Replace the complete receiver unit, wiring it like-for-like according to the Drayton wiring diagram. Re-pair with the thermostat if required.
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Repair Difficulty
Hard
4/5
Required Part
Drayton Receiver / Heat Hub Relay Module
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