INFORMATION SET BOILER TO ECO

Because it is not possible to confirm the appliance is in eco or preheat mode, it must be manually set outside the display.
If the appliance has hot water control fitted, ensure it is set to OFF.
(This may be with an internal programmer as shown or with an external programmer)
Any test which requires the preheat on will advise and offer alternative tests.
If NO hot water controls are fitted:

Isolate Mains Power to appliance as per TOP's P4

Gain access to the lower PCB
Remove the link between Lr for HW and L

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Once preheat has been turned off or the link has been removed, click continue to return to fault diagnosis.

Example of programmer that can disable the appliance preheat.

Note:
Ensure link is refitted once diagnosis is complete.