Fault Finding And Diagnosis; Internal Wiring Diagram - Bosch Worcester Greenstar CDi Compact ErP Series Installation, Commissioning And Servicing Instruction

8

FAULT FINDING AND DIAGNOSIS

8.1

Internal wiring diagram

FAN
1
FLOW
N L
GAS
VALVE
SAFETY
SOLENOID
Red
G/Y
Blue SAFETY
Orange
SOLENOID
4
7
5
EMS
CH TEMPERATURE
CONTROL
LCD DISPLAY
X7
13
13
CDi Compact ErP - 6 720 813 276 (2015/07)
Fan wiring:
Live = Brown
Neutral = Blue
2
NTC
RETURN
NTC
PUMP SUPPLY
PRE WIRED LINK
DHW
NTC
230V
FR FS LR LR
OUT
N L N L N
Worcester 24V controls point
HCM (at rear of PCB)
X6 X5
1 13 1 13 1
15
14
2
3
8 11
6 9
10
12
FLUE
STAT
SPARK
ELECTRODES
FLAME SENSE
ELECTRODE
3
15
MAX SAFETY NTC
FLAME SENSE
14
GROUND
6
PUMP
PUMP CONTROL
FLOW
TURBINE
DHW INLET NTC
(PREHEAT OPTION)
12
Fuse, slow
230V
F 5A H 230 V
IN
L N L N L
EMS BUS point
X3 X11 X4
1
7
4
1
4
FAULT FINDING AND DIAGNOSIS
AIR PRESSURE
SWITCH
13
DIVERTER
VALVE
11
9
10
DHW TEMPERATURE
CONTROL
DIAGNOSTIC
INPUT
X12
5
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