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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.
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