Baxi Combi 130 HE Installation & Servicing Instructions Manual page 48

240 V at A ?
YES
240 V at B ?
YES
Main PCB Fuse OK ?
YES
240 V at C ?
YES
24Vac at D ?
YES
5Vdc at E ?
YES
Replace Display PCB.
48
No Display
Ensure that mains is
securely connected to
NO
incoming plug and that
wiring from electrical filter
to boiler 8-way terminal
block is OK.
Check wiring from boiler
NO
8-way terminal block to
PCB is OK.
Check for shorts on
NO
Pump, Diverter Valve,
Fan and Gas Valve,
then replace fuse.
NO
Replace Main PCB.
NO
Replace Transformer.
NO
Replace Main PCB.
15.0 Fault Finding
Prog Prog R/S R/S
N L 1 2 1
A
B
Mains Input
Burner On
&
Fault Neons
Pump
Diverter Valve
Gas Valve
Modem PCB
Room Thermostat
Extra
2
Pump
C
D
Transformer
Flow &
Return
Thermistors
Overheat
Thermostats
&
Flow Switches
&
Condensate Trap
Fan
Display PCB
Room Control
E