To activate the appliances maximum and minimum output modes follow the instructions below:
Observation:
Service mode buttons
Step 1: Press and hold buttons A, B and C for 10 seconds and the display will display the image to the right.
Step 2: Press and hold button B and C until "LP" is shown alternating with boiler temperature. The appliance is now in minimum output mode check and adjust combustion as necessary.
Step 3: Press key B repeatedly until "dP" is shown alternating with the boiler temperature. The appliance is now in Maximum output mode, check and adjust combustion as necessary.
Notes: 1. Button C can be pressed to navigate back from maximum mode to minimum mode if required. 2. To exit the service mode press buttons A, B and C together for ten seconds and the boiler will return to normal operating mode.