4.12 NO DHW BUT CH WORKS OK
Does tap symbol change from blue to
orange when a tap is turned on?
NO
YES
Are the flow rates correct?
Is the wiring between the PCB and the diverter
valve motor connected?
YES
YES
Is diverter head fully engaged and clip secured
onto water set?
YES
Is diverter valve stuck in CH position?
YES
Check and re-fit diverter valve actuator head. Is
boiler DHW OK?
NO
Change diverter valve motor
NO
Are hot & cold pipe work crossed?
NO
Remove turbine & check for
debris in turbine & filter. Replace
turbine if necessary.
NO
Adjust flow rates to achieve 35°C
temp rise and check filter fitted in
turbine is not blocked with debris
NO
Reconnect wiring or replace
wiring harness if no continuity
Correct pipe work
YES
NO
Is wiring connected between PCB
& DHW turbine?
Re-connect wiring
NO
YES
Replace DHW turbine
NO
Re-engage diverter head and
secure clip to water set
Replace PCB
COMBI
HEA
T / SYSTEM
SL1
L
IN
L
IN
SL2
OPTIONAL
FROST STAT
ROOM
STAT/
TIMER L N
MAINS IN
UIN
230010 A01
L N
MAINS IN
Refer to Section
1.2
OPEN THERM./
WEATHER COMP.
61
Installation and Servicing
Section 4 - Fault Finding
FAUL
T FINDING
