E22
Atlantic
Communication Fault with External Module
Boiler shows E22, often when using advanced Atlantic controls or remote connectivity.
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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
Faulty communication bus wiring, Incorrect polarity on bus, Failed external module (e.g., internet gateway, zone controller), Firmware incompatibility
How to Fix / Troubleshooting
Safety: Isolate power before altering low-voltage bus wiring.
- Check bus connections: Ensure the two-wire communication bus is correctly connected, with proper polarity, and not shorted.
- Disconnect external modules: Temporarily disconnect add-on modules (internet gateway, zone controllers). If E22 clears, reconnect them one by one to identify the faulty device.
- Update firmware: If available, have a technician update firmware on the boiler and controls to the latest Atlantic versions.
- Replace faulty module: The defective external module should be replaced with a compatible Atlantic unit.
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Repair Difficulty
Medium
3/5
Required Part
External Communication Module
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