BoilerFaultCodesWhat the manual says
Manufacturer manualElectronics temperature too high: Electronics too hot due to external effect, electronics defective
What causes this fault?
This fault occurs when the boiler's main control board reaches a temperature that risks melting internal components or causing a fire. The most common reasons are an internal electrical short circuit, poor ventilation around the boiler casing, or being located too close to an external heat source. If the heat is generated from within the board itself, it usually indicates that a specific electronic component has failed and is drawing too much current.
This fault is more common during heatwaves in the summer, especially if the boiler is installed in a poorly ventilated cupboard or a hot loft space.
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.
Avoid the next call-out bill
A cover plan would handle faults like F.65: no call-out fees, no surprise bills.
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