F6' - Outside Sensor Fault; No Ch Operation But Hw Works Ok - Zanussi ULTRA+ COMBI 30 Installation And Servicing

4.10 'F6' - OUTSIDE SENSOR FAULT

Is the wiring securely connected at both the boiler and
Outside Sensor?
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
o
At 15 C expect
o
At 30 C expect
o
Is the Outside Sensor value correct?
Is the wiring securely connected between the
incoming terminal block boiler connection of the
Outside Sensor and the PCB?

4.11 NO CH OPERATION BUT HW WORKS OK

Is the mode knob in the Winter position?
Are the Timer and the Room Thermostat switched on?
Are the Radiator Valves Open?
Is there 230Vac at (A)?
Replace the Diverter Valve Motor
Installation and Servicing
SECTION 4 - FAULT FINDING
YES
31,000 - 35,000 Ohms
15,000 - 16,500 Ohms
7,700 - 8,500 Ohms
YES
YES
YES
YES
YES
NO
Securely connect the wiring at both the
boiler and Outside Sensor
NO
Fit a new Outside Sensor
Securely connect the wiring at the
NO
Terminal Block and the PCB
Replace PCB
YES
NO
Move the mode knob to the Winter position
NO
Switch the Timer and Room Thermostat On
NO
Open the Radiator Valves
There is no Voltage from the Timer/Room Stat. This
NO
is not boiler fault. Ensure Voltage is supplied to
boiler by rectifying external wiring.
A
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