BoilerFaultCodesWhat the manual says
Manufacturer manualSafety temperature limiter has tripped due to excessive temperature; requires manual reset.
What causes this fault?
This fault occurs when the water inside the boiler exceeds a safe temperature limit, causing a safety switch to cut the power. The most common reasons are a pump failure that stops water from moving or a buildup of debris that blocks flow through the heat exchanger.
This issue is more frequent when heating is first turned on after summer, as pump components can seize up during 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.
Avoid the next call-out bill
A cover plan would handle faults like Overheat light on: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.