As far as I remember....
The left one regulates the thermostat and is also a push down to ignite. It may be piezo or may be battery.
The right one is bottom switch is manual/off/auto for fan speed, with the dial above regulating manual fan speed.
Can't tell which model it is, try here.
If it is not a current model, you may need to go to this Truma archive website for the manual.
Almost the same as mine except mine has an ignitor button on the left.
The left one is thermostat for gas and right one is fan.
A is auto
The sort of moon thing is manual and the middle one is fan off.
Electric heating works from a round knob on the wall somewhere.
Not sure if this helps