Legend
1
Ignition module
2
Ignition and control electrode
3
Heating return thermistor
4
Overheat thermostat
5
Pump
6
Main board
7
User interface
8
On/Off switch
9
Fuse
10
Water flow sensor
11
Three way valve
12
Water pressure sensor
13
Heating flow thermistor
14
Gas valve
15
Fan
16
Thermal fuse