Keston Combi 35kw User Manual download pdf (Page 61)

Fault Finding

Fault Finding Fault Finding Fault Finding Fault Finding Fault Finding

Keston Combi - Installation and Servicing

RETURN THERMISTOR FAULT - CONTACT INSTALLER

Remove the Return Thermistor from the CH Return

Pipe and disconnect the wires.

Check the resistance using a suitable multimeter

connected across the thermistor’s terminal pins.

At 25

C expect 9,700 - 10,300 Ohms

At 60

C expect 2,400 - 2,600 Ohms

At 85

C expect 1,000 - 1,100 Ohms

Is the Thermistor value correct?

YES

Is there continuity between the PCB and the Thermistor?

Fit a new Thermistor

FAN FAULT - CONTACT INSTALLER

Does the wiring from the Fan to the PCB have

secure connections at both ends and has not

deteriorated? Does the wiring have continuity?

YES

Rectify Wiring &

connections

Is there 230Vac at the Blue and Brown connections

to the 3 way connection on the Fan?

Replace PCB

YES

Replace Fan

YES

Replace PCB

Check and replace wiring as necessary

OUTSIDE SENSOR FAULT - CONTACT INSTALLER

Disconnect the wires to the outside sensor.

Check the resistance using a suitable multimeter

connected across the Outside Sensor’s terminal pins.

At 0

C expect 31,000 - 35,000 Ohms

At 15

C expect 15,000 - 16,500 Ohms

At 30

C expect 7,700 - 8,500 Ohms

Is the Outside Sensor value correct?

YES

Is the wiring securely connected between the

incoming terminal block boiler connection of the

Outside Sensor and the PCB?

Replace PCB

Fit a new Outside Sensor

Securely connect the wiring at the

Terminal Block and the PCB

Is the wiring securely connected at both the boiler and

Outside Sensor?

YES

Securely connect the wiring at both the

boiler and Outside Sensor

YES

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Keston Combi 35kw User Manual Page 61

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