Bosch Condens 2000 W, Руководство по обслуживанию

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22 | Failures / Errors
E2
and operating LED is flashing.
Central heating flow temperature sensor failure (pump is running).
Control Step Action
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 ? (resist-
ance table)
yes: B Check the connection terminal on NTC.
E2 failure still exist ? -->2.
no:
B
Change NTC.
B Connect the cable.
B Switch on the appliance.
E2 failure still exist ? -->2.
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 measured
resistance values at at NTC and
socket connection same?
yes: B Chance the cable harness.
B
Switch on the appliance.
E2 failure still exist ? -->3.
no: -->3.
3. Electronic card is defect.
B
Switch off the appliance.
B Cut mains supply.
B
Change the electronic card.
B
Connect to main supply.
B Switch on the appliance.