Zanussi ULTRA COMBI 35 Installation And Servicing page 58

80 ALTERNATING 'F' AND '6' - 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?
81 ALTERNATING 'c' AND '2' - BCC FAULT (BOILER CHIP CARD)
Is the correct BCC for the boiler securely inserted into the
slot at the front left of the PCB?
(identified by the label on the BCC)
Replace the BCC with a new BCC (that is correct for the
boiler). After switching power on and 'c0' being shown,
press restart. Is 'c2' still shown?
RESET PROCEDURE - To restart boiler, turn mode knob to restart position and immediately turn knob back to required setting.
58
FAULT FINDING
YES
31,000 - 35,000 Ohms
15,000 - 16,500 Ohms
7,700 - 8,500 Ohms
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 Securely insert the correct BCC for the boiler
into the PCB and after switching power on and
'c0' being shown, restart boiler.
Note. Ensure the correct orientation of BCC by
placing "TOP" side up.
YES
Replace PCB
Installation and Servicing