E83
FAULT CODE
Main Heating
Communication Error
Medium Severity
Engineer Required
A communication error between the boiler PCB and external controls or room controller.
Step-by-Step Fix Guide
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Step 1
Check wiring connections to the room controller
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Step 2
Turn off at mains for 10 minutes, then restart
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Step 3 Engineer only
Call a Gas Safe engineer if fault persists
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.