7 181 465 347 (01.07)
Rectifying faults
25
E2 flashing.
The heating outlet NTC sensor is damaged.
Check Action
1. B Activate menu option
Show service parameters.
B Select .1 Flow temp.sensor.
Is a temperature between 0. and 5.
displayed?
yes: The heating outlet NTC sensor is in short circuit:
B Power OFF the appliance.
B Replace CH flow NTC sensor; observe fitting
instructions for NTC sensor when doing so.
B Turn ON the appliance.
E2? ↓2.
no: ↓ 2.
2. Heating outlet NTC sensor:
Temperature between 95. and 100. is
displayed.
yes: The CH flow NTC sensor is interrupted:
B Power OFF the appliance.
B Replace CH flow NTC sensor; observe fitting
instructions for NTC sensor when doing so.
B Turn ON the appliance.
E2? ↓3.
no: ↓3.
3. Check if the 20-pin connector lead
assembly is damaged.
B Power OFF the appliance.
B Change the 20-pin connector lead assembly.
B Turn ON the appliance.
E2? ↓4.
4. The PCB control board is damaged. B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
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