Bosch T5700S 15 D 23 - ECU Overview (LPP)

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