BoilerFaultCodesTechnical description: Flue gas thermostat or fan fault
What causes this fault?
This fault occurs when the boiler's safety sensors detect that the fan isn't moving air properly or the exhaust gases are getting too hot. The most common reasons are a blockage in the flue pipe, a failing fan motor, or a fault with the sensor that monitors the exhaust temperature.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like E03 — no call-out fees, no surprises.
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