Set Appliance State:

WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Boiler On/Off switch On.
Reset lockout if necessary.
Ensure boiler is set to ECO mode, button is lit, if not lit press and hold the ECO button until it illuminates, do not disable this function unless advised to do so in SET APPLIANCE STATE as misdiagnosis will occur.