64
F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING
Installation and Servicing
SECTION 4 - FAULT FINDING
L
N
4.12 NO HW BUT CH ON
Does the display
show a similar
screen to the
screen shown?
NO
YES
Are the flow rates correct as per Section 1.2.
Is the wiring between the PCB and the diverter
valve motor connected?
YES
YES
Check diverter head fully engaged and clip
secured onto waterset.
YES
Is diverter stuck in the CH position
YES
Check and replace diverter valve motor head.
Is Boiler DHW OK?
NO
Change diverter Valve motor
NO
Adjust flow rates to achieve 35º
temp rise and check filter is not
blocked with debris.
NO
Reconnect wiring or
replace wiring harness if
no continuity.
NO
Re-engage diverter
head and secure clip to
wateset
NO
Replace PCB
Is the wiring connected
between PCB and DHW
sensor?
Remove the turbine, and
check for debris in the
turbine & filter. Replace
turbine if necessary. Is
DHW OK?
YES
NO
Re-connect wiring
NO
Replace turbine sensor
4.13 NO DISPLAY
Is there 230Vac to the boiler at L and N?
YES
NO
Supply power to the boiler
Is the wiring from the terminal block to the PCB
connected securely?
YES
NO
Connect the wiring from the terminal block to the
PCB securely.
Replace the PCB?