E17
Drayton
Boiler Interface Communication Fault
Thermostat shows E17 and cannot communicate with the boiler interface module.
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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
Disconnected OpenTherm/eBus cable (if used), Incorrect wiring to boiler interface, Failed communication IC in receiver, Incompatible boiler protocol
How to Fix / Troubleshooting
Safety first: Isolate mains power to the boiler and receiver before touching any wiring.
- Verify wiring: Check the low-voltage communication terminals between the Drayton receiver/HubR and the boiler (e.g. OpenTherm pair). Ensure polarity and terminals match the boiler manual.
- Check cable integrity: Inspect the communication cable for damage or kinks. Replace if suspect.
- Confirm compatibility: Ensure the boiler supports the communication protocol used by the Drayton interface. If not, use simple on/off control instead.
- Test with on/off mode: Temporarily configure the system for basic relay control (if supported) to confirm boiler operation.
- Replace interface: If wiring and compatibility are correct but E17 persists, the communication interface in the receiver may be faulty. Replace the receiver or interface module.
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Repair Difficulty
Hard
4/5
Required Part
Boiler Interface / Communication Module
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