Benchmark Procombi Exclusive 24 Installation & Servicing Instructions Manual page 59

82 NO HW BUT CH ON
Does the display show "d" when a tap is on?
Are the flow rates correct as per Frame 2.
Is the wiring between the PCB and the diverter
valve actuator connected?
Check diverter head fully engaged onto
waterset body
Is diverter stuck in the CH position
Check and replace diverter valve actuator head.
Is Boiler DHW OK?
Change diverter valve assembly.
83 NO DISPLAY
Is there 230Vac to the boiler at L and N?
Is the wiring from the terminal block to the Main PCB
connected securely?
Is the ribbon cable from the main PCB to the User
Interface PCB connected securely?
YES
Is ribbon cable damaged?
YES
Replace ribbon cable
Procombi Exclusive -
FAULT FINDING
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
YES
Replace the
NO
User Interface
PCB
Installation and Servicing
Is hot and cold pipework crossed?
Adjust flow rates to achieve 35º
temp rise and check filter fitted in
turbine is not blocked with debris.
Reconnect wiring or
replace wiring harness if
no continuity.
Re-engage diverter
head.
Replace PCB
NO
Supply power to the boiler
NO
Connect the wiring from the terminal block to the
Main PCB securely.
NO
Connect the ribbon from the main PCB to the User
Interface PCB securely
NO
Is the wiring connected
between PCB and DHW
sensor?
YES
Remove the turbine, and
check for debris in the
turbine. Replace turbine
if necessary. Is DHW
OK?
NO
Replace turbine sensor
Re-connect wiring
N
L
NO
59