E11
Baxi
Control PCB Communication Fault
Furnace displays a communication error between the user interface and the main PCB; controls are unresponsive or blank.
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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
Loose data cable between the display and main PCB, faulty user interface board, defective main control PCB, moisture ingress on low-voltage connectors.
How to Fix / Troubleshooting
Safety: Turn off the power before accessing the control panel.
- Inspect display cable: Remove the front control panel cover and check the ribbon cable or harness connecting the Baxi display module to the main PCB. Reseat both ends.
- Check for moisture: Look for signs of condensation or water damage around the electronics. Dry gently and address any leaks from above.
- Power cycle: Restore power and perform a full power cycle (off for 30 seconds, then on). Observe if the display recovers.
- Module substitution: If available, test with a known-good user interface module. If the fault persists, the main PCB may be defective.
Professional help: PCB replacement and configuration should be performed by a Baxi-trained technician.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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