BoilerFaultCodesTechnical description
Fuse Type (F1A). Before using the fault finding chart ensure all wiring is correct and in good condition, the pump is not faulty and check the PCB fuse F2.
What causes this fault?
This fault occurs when an electrical surge or a component failure causes a safety fuse on the main control board to blow, cutting power to prevent further damage. The most common reason is a seizing water pump that is drawing too much current or a short-circuit within the boiler's internal wiring. As a result, the boiler shuts down completely to protect its sensitive electronic parts.
This fault is more common in the autumn when heating systems are turned on for the first time after summer, as pumps are more likely to seize after long periods of inactivity.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.