Some versions of the PCB incorporate an air purge cycle each time the appliance is switched on, others do not.
The air purge cycle lasts for 2 minutes each time power is restored to the appliance. The appliance will not respond to a demand during this period.
If the appliance you are working on incorporates an air purge cycle it can be cancelled by removing the main control knob and pressing the CO button at the top for 1 second during the cycle.
Please note the control knob must be in the DHW and CH mode position prior to doing this for the purposes of this model. If the CO button is pressed when in the standby position then the appliance will attempt to enter CO mode (combustion mode).
The air purge cycle lasts for 2 minutes each time power is restored to the appliance. The appliance will not respond to a demand during this period.
If the appliance you are working on incorporates an air purge cycle it can be cancelled by removing the main control knob and pressing the CO button at the top for 1 second during the cycle.
Please note the control knob must be in the DHW and CH mode position prior to doing this for the purposes of this model. If the CO button is pressed when in the standby position then the appliance will attempt to enter CO mode (combustion mode).
