Baxi Combi 130 HE Installation And Servicing Instructions page 50

Diverter Valve Fault
230Vat F ?
YES
With
DHW off & CH on,
is there 230V between
P & Q ?
YES
With
DHW off & CH on,
is there 230V between
R & T ?
YES
Replace Diverter
Valve.
Is
Flow Restrictor
Fitted ?
YES
Is
Flow Restrictor
Fitted Correct Way
Up ?
YES
With
DHW & CH off,
is there 230V between
O & P ?
YES
With
DHW & CH off,
is there 230V between
S & T ?
YES
With
DHW on,
is there 230V between
P & Q ?
NO
Replace Diverter
Valve.
50
Supplied By www.heating spares.co Tel. 0161 620 6677
No CH but DHW OK
NO
Go to External Controls
section of the fault
finding instructions.
NO
Replace Main PCB.
NO
Black wire from Main
PCB to Diverter Valve
Faulty.
No DHW but CH OK
NO
Fit Flow Restrictor.
NO
Reverse Orientation.
NO
Replace Main PCB.
NO
Blue or Brown wires
from Main PCB to
Diverter Valve Faulty.
YES
Replace Main PCB.
15.0 Fault Finding
Transformer
Mains Input
Burner On
&
Fault Neons
Pump
O
Diverter Valve
P
Q
Gas Valve
Modem PCB
A
Room Thermostat
F
Diverter Valve Plug
(when unplugged)
R
T
S
Flow &
Return
Thermistors
Overheat
Thermostats
&
Flow Switches
&
Condensate Trap
Room Control
Display PCB
Fan