E30
Vokera
Boiler feedback / status line communication fault
Thermostat shows E30 and cannot detect boiler status feedback
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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 feedback wire between boiler and thermostat (if used), Boiler not configured to send status over bus, Faulty boiler communication PCB, Incorrect wiring to Vokera smart interface module
How to Fix / Troubleshooting
Safety first: Isolate power to the boiler before working on any low-voltage communication wiring.
- Check wiring diagram: Refer to the Vokera installation manual to confirm which terminals are used for status feedback or bus communication.
- Inspect connections: At both the boiler and thermostat (or interface module), ensure the feedback/bus wires are correctly landed and secure.
- Confirm boiler settings: In the boiler installer menu, verify that external control and status reporting are enabled if required.
- Test basic control: Even if status feedback fails, check whether the thermostat can still turn the boiler on and off. If heating works, E30 mainly affects advanced features like error reporting and modulation.
- If E30 persists: The boiler's communication PCB or the thermostat interface may be faulty. Contact a heating engineer or Vokera support.
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Repair Difficulty
Hard
4/5
Required Part
Vokera boiler communication PCB
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