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3
Failures / Errors
4Y
is flashing.
Central heating flow temperature sensor failure (pump is running).
Control Step
1.
Check if CH flow temperature sensor
(NTC) is damaged or not ?
B Switch off the appliance.
B Pull cables out.
B Measure the electrical resistance
of the NTC sensor.
Are the measured values OK ?
(resistance table)
2.
Check if the cables are damaged or
not?.
B Switch off the appliance.
B ·If NTC changed :
- disassemble the NTC cable from
NTC.
- measure the sensor resistance.
- assemble the NTC to NTC cable
again.
B Pull out the 20 poled (main socket)
connector from the electronic
card.
B Measure the electrical resistance
of NTC on socket. Are the meas-
ured resistance values at at NTC
and socket connection same?
3.
Electronic card is defect.
14
Action
yes:
B Check the connection terminal on NTC.
4Y failure still exist ? -->2.
no:
B Change NTC.
B Connect the cable.
B Switch on the appliance.
4Y failure still exist ? -->2.
yes:
B Chance the cable harness.
B Switch on the appliance.
4Y failure still exist ? -->3.
no:
-->3.
B Switch off the appliance.
B Cut mains supply.
B Change the electronic card.
B Connect to main supply.
B Switch on the appliance.
GB012 - 25K
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