A1 and fault indicator LED are flashing – Controlled characteristic pump has run dry

StepCheck Action
1.System pressure below 1.2 baryes▶ Power OFF the appliance
▶ Check appliance and system for water leaks and repair as necessary.
▶ Fill system, bleed and re-pressurise
(see Installation Instructions).
▶ Turn ON appliance
A1? go to step 2
no:go to step 2
2.Pump seized or sticking?yesFree/release pump
no:go to step 3
3.Audible bearing damage on pumpyes:▶ Power OFF the appliance
▶ Disconnect the boiler electrical connection.
▶ Drain appliance.
▶ Change the pump (see Installation Instructions).
▶ Fill system, bleed and repressurise
(see Installation Instructions).
▶ Reconnect the boiler electrical connection.
▶ Turn ON the appliance.
no:go to step 4
4.Activate venting sequenceyes▶ Select in the first service level, service function 2.C (Air Purge mode - see page X).
▶ Select the value 1 and store.
▶ Exit the service function.
▶ The boiler vents for eight minutes.
▶ Vent radiators manually.

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