BoilerFaultCodesTechnical description
Circulation error or dry fire
What causes this fault?
This fault occurs when the boiler's internal sensors detect that heat isn't being carried away from the heat exchanger quickly enough, usually due to a lack of water flow. The most common reasons are a failed circulation pump that can no longer push water through the radiators, or a blockage such as a build-up of sludge or air in the pipework.
This issue is frequently seen in autumn when heating systems are turned back on after a long summer break, as pumps can often seize up during 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.
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