IDEAL LOGIC + Combi 24 Installation And Servicing page 63

91 NO hW BUT Ch ON
Does the display show "hot water" -
"temperature XXºC" - "high efficiency"?
Are the flow rates correct as per Frame 2.
Is the wiring between the PCB and the diverter
valve motor connected?
Check diverter head fully engaged and clip secured
onto waterset.
Is diverter stuck in the CH position
Check and replace diverter valve motor head.
Is Boiler DHW OK?
Change diverter Valve cartridge - rear section
92 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
+
Ideal Logic Combi -
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 the red neon
illuminated on the turbine
sensor?
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 and secure clip to
wateset
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
YES Is hot and cold
pipework crossed?
NO
NO
Replace PCB
Is the wiring connected
between PCB and DHW
sensor?
YES
Remove the turbine, and
check for debris in the
turbine & filter. Replace
turbine if necessary. Is
DHW OK?
NO
Replace turbine sensor
Re-connect wiring
NO
L
N
63