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Installation and Servicing
SECTION 4 - FAULT FINDING
4.10 OUTSIDE SENSOR FAULT
Disconnect the wires to the outside sensor.
Check the resistance using a suitable multimeter
connected across the Outside Sensor’s terminal pins.
At 0
o
C
expect
31,000 - 35,000
Ohms
At 15
o
C expect
15,000 - 16,500
Ohms
At 30
o
C expect
7,700 - 8,500
Ohms
Is the Outside Sensor value correct?
YES
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
NO
Securely connect the wiring at the
Terminal Block and the PCB
Is the wiring securely connected at both the boiler and
Outside Sensor?
YES
NO
Securely connect the wiring at both the
boiler and Outside Sensor
NO
