SERVICE MODE MAX AND MIN GUIDE

To enter service mode press and hold the central heating + / - keys for 6 seconds.
The display will flash showing "1" and "00" to signify 100% or maximum output, the tap and radiator symbols will also flash once the burner has ignited (the flame symbol will also appear in the display)

Press the central heating - key until "35" is displayed
The appliance is now in minimum output mode.

To return the appliance to normal operation press and hold the central heating + / - keys again for 5 seconds.

Note: The appliance will not enter service mode until the fan and pump purge completes