Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Ensure No demands are present
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Fault code E44 occurs when the boiler has attempted to fire repeatedly for the maximum time limit.
1. Check for rapid on/off tap requests, this could be customer related or issues with the installation i.e. a faulty DHW tap or leak on the pipework etc.
2. Check external control requests, again this could be customer related or issues with the external controls installation i.e. faulty room state or programmer etc.