Bosch PROTANKLESS GWH 345/450 ESR - Manual (Page 29)

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Operating instructions
29
4.8 Electrical diagram
Fig. 35 Electrical scheme
10 Flame sensor
11 Ignitor electrode
12 Gas valve
13 Junction box (wiring of tank pump)
14 Fan
15 Temperature limiter / ECO
16 Differential pressure switch
17 TT connection - under low voltage cover plastic
18 Domestic hot water temperature sensor (12kOhm only -
under low voltage cover plastic)
19 LED
20 Fuse
NOTICE: Except for the fuse, there are no serviceable
parts inside the electronics.