7 181 465 347 (01.07)
Rectifying faults
17
4.4 Faults indicated on display
A1 flashing.
Controlled-characteristic pump has run dry
Check Action
1. System pressure below 1.2 bar? yes: B Power OFF the appliance.
B Check appliance and system for water leaks and
repair as necessary.
B Top up system.
B Turn ON the appliance.
A1? ↓2.
no: ↓2.
2. Activate venting sequence. B Activate menu option Show service parameters.
B Select 7.3 Aeration mode select setting On,
autom. deactivat. and confirm.
B Vent appliance
1)
.
B Vent radiators.
↓3.
1) See installation instructions
3. Audible bearing damage on pump? yes: B Power OFF the appliance.
B Drain appliance.
B Replace pump.
B Top up system.
B Turn ON the appliance.
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