F49
FAULT CODE
Heatline
eBUS Communication Fault
Medium Severity
Engineer Required
There is a communication fault on the eBUS — the communication bus between the boiler and external controls (such as a programmer or smart thermostat).
Step-by-Step Fix Guide
-
Step 1
Check the wiring between the boiler and any eBUS-compatible controls
-
Step 2
Try disconnecting the eBUS controls and resetting the boiler
-
Step 3 Engineer only
If fault persists, call a Gas Safe engineer or controls specialist
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.