The MK6 is a very straight forward keypad to use. The mode button is used to select between "Manual" and "Automatic" mode. This is the 2 modes of operation. There are 4 Fan settings which are displayed by the LED's, no lights means the fan is off. 1 light = level 1 etc. The heater also has 4 settings and likewise with the Fans, no light means the fan is off. 1 light means level 1 etc. The ventilation source is there to highlight where the air is being taken from, if the LED light outside the house roof is on then the air is being supplied from outside, vice versa if the light in the roof is on, warm air from the roof space is being used. This is if you have a damper integrated into your system. The button on the right is used for Heat Transfer and Ozone add on to the System. If the tear drop light is illuminated red, then this means the filter needs to be changed.
