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19
Rectifying faults
Error A7
A7
flashing.
Water NTC sensor defective
Check
Action
1.
B
Activate menu option Show serv-
ice parameters.
B
Select service function 0.2 Hot
water temp. sensor.
Is a temperature between 0 and
5˚C displayed?
yes:
DHW temperature limiter connector corroded
1)
,
damaged or dirty?
B
Change relative parts.
A7?
↓
2.
1)
For notes, refer to Appendix
no:
↓
2.
2.
B
Unplug 20-pin connector from
PCB.
E2 is displayed.
B
Check resistance from connec-
tions 3 to 4 on the cable side.
Does the value match the ones
described in table 7, page 50?
yes:
B
Make a note of the altered service function set-
tings (see table 1 on page 7) in order to keep the
altered values.
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.
B
Restore service settings previously noted down.
no:
↓
3.
3.
B
Unplug NTC sensor from cable.
B
Check resistance of NTC sensor.
Does the value match the ones
described in table 7, page 50?
yes:
B
Power OFF the appliance.
B
Disconnect the boiler electrical connection.
B
Change the 20-pin connector lead assembly.
B
Reconnect the boiler electrical connection.
B
Turn ON the appliance.
no:
B
Change NTC sensor.
