Set Appliance State:

Mains Power Off
CH Demand
CH temperature control knob to max
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance as necessary.
Allow boiler to complete its self check.
Press the spanner button so i1 is displayed.
Allow the boiler to fire for heating.
Observe the status when the appliance shuts down prematurely.
Is E9 with status code 210 displayed?
Note:
If E9 is displayed but a different status code is shown e.g. 219 then select "Different fault code or status displayed"