BOILER ENTERS STAND-BY MODE

Mains Power Off

Selector switch set to Off/Reset
Ensure NO demands

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

Mains Power On

Does the status led flash GREEN once every 5 seconds? (see note)

Normal operation

Example fault codes

Note.
Failure to set selector switch to Off/reset as per set appliance state will result in misdiagnosis.