Adjust, Service, Repair or Replace as necessary
Isolate Mains Power to appliance as per TOPs P4
Isolate Water and Gas as appropriate

Location:
The anti-frost function acts on the central heating flow temperature probe, independently from other regulations, when the electrical supply is turned on.
Upon completion of the fault diagnostics carry out final electrical safety tests and checks as per TOPs (C6).

Refer to ADAPT for further information.

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