Keston Combi 35kw User Manual download pdf (Page 63)

Fault Finding

Fault Finding Fault Finding Fault Finding Fault Finding Fault Finding

Keston Combi - Installation and Servicing

NO DISPLAY

Is there 230Vac to the boiler at L and N?

YES

Supply power to the boiler

Is the wiring from the terminal block to the Main PCB

connected securely?

YES

Connect the wiring from the terminal block to the

Main PCB securely.

Is the ribbon cable from the main PCB to the User

Interface PCB connected securely?

Connect the ribbon from the main PCB to the User

Interface PCB securely

YES

Replace the

User Interface

PCB

Is ribbon cable damaged?

YES

Replace ribbon cable

NO HW BUT CH ON

Does the display show “hot water” -

“temperature XXºC” - “high efciency”?

Is the red neon

illuminated on the turbine

sensor?

YES

Are the ow rates correct as per Frame 2.

Is the wiring between the PCB and the diverter

valve motor connected?

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?

Change diverter Valve cartridge - rear section

Adjust ow rates to achieve 35º

temp rise and check lter tted 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

YES

Is hot and cold

pipework crossed?

Replace PCB

Is the wiring connected

between PCB and DHW

sensor?

Remove the turbine, and

check for debris in the

turbine & lter. Replace

turbine if necessary. Is

DHW OK?

YES

Re-connect wiring

Replace turbine sensor

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Keston Combi 35kw User Manual Page 63

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