Bosch T2400S 8 ND 23 Training And Service Information For After Sales page 25

Overview of ECU (electronic control unit)
1- Ionization electrode (Flame detection)
2- Ignition electrode
3- Transformer
4- Power supply
5- Fan
6- Water flow sensor
7- Water inlet temperature sensor
8- Water outlet temperature sensor
9- HMI
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LPP
10- APS (air pressure switch)
11- Segment valve B
12- Segment valve A
13- Gas valve solenoid
14- Safety solenoid valve
15- Temperature limiter (thermostat)
Pict.32 – Electric Diagram LPP circuit board
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