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18
Rectifying faults
Error A1
4.4 Error codes on the 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 Fill system, bleed and re-pressurise (see Installa-
tion Instructions).
B Turn ON the appliance.
A1? ↓2.
no: ↓2.
2. Audible bearing damage on pump? yes: B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Drain appliance.
B Change the pump (see chapter 5.4).
B Fill system, bleed and re-pressurise (see Installa-
tion Instructions).
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
↓3.
no: ↓3.
3. Activate venting sequence. yes: B Activate menu option Show service parame-
ters.
B Select 7.3 Air purge mode select setting on,
autom. deactivat. and confirm.
B Vent appliance.
B Vent radiators.
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