Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Ensure Central Heating Turned OFF
Ensure Appliance is set to ECO mode
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset the appliance as necessary.
The appliance should now complete a self check of approx. 30 seconds.
The pump should begin to run approx. 3 seconds after the power is turned on and then run for a further 10 seconds.
The fan should also run at a constant low speed, however, if it behaves differently a fault code will be displayed C7 FAN FAULT.
Once the self check has completed, press the spanner button once.
The boiler should be in status mode 203 or 204.
If a fault code or different status is displayed click Here to go to fault code list.
Some faults will not be displayed without clicking on the spanner button.