BoilerFaultCodesTechnical description
Safety relay does not close
What causes this fault?
This fault occurs when the boiler's internal computer tries to engage a safety switch but detects that it has failed to close. The most common reason is a mechanical or electrical failure within the main circuit board, which prevents the system from confirming it is safe to ignite the burner. Because this involves a critical safety check, the boiler will prevent all operation to protect the household.
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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