Set Appliance State:

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

Observation:

Allow boiler to complete initialisation (power on approx. 10 seconds).
Turn the CH temperature control knob.
At minimum the display on the top left should be 20°C.
At maximum the display on the top left should be 75°C (see note)
Does the display show the set temperature changing as above?
Note:
1. Maximum temperature may set differently as per system requirements.
2. Default setting is 90°C but this is known to cause overheat or noise issues, recommended value is 75°C
3. Click HERE for instructions on how to adjust maximum temperature.