Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
DHW Temperature Selector to MAX
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Observation:

Does the boiler now attempt to fire or does the 60 deg light begin flashing again?
Choose from the options below:
Boiler Attempts to Fire - Continue fault finding through main model
60 deg light fault reoccurs
Different fault code appears