Specifications

7 181 465 346 GB (03.02)
25
Failure identification procedure
C1 flashing.
Fan speed too low
Check Action
1. Fan lead connector properly con-
nected?
yes: ↓2.
no: B Power OFF the appliance.
B Plug in connector.
B Turn ON the appliance.
C1? ↓2.
2. Is fan lead defective?
B Is impedance reading between the
two connectors for one of the
cores infinity?
yes: B Power OFF the appliance.
B Replace fan lead.
B Turn ON the appliance.
C1? ↓3.
no: ↓3.
3. Are the differential pressure switch
contacts closed?
B Press button .
B Select service function 3.8 .
Is left digit of display showing 1?
yes: ↓4.
no: ↓4.
4. Fan defective? yes: B Power OFF the appliance.
B Plug the connection wire.
B Replace fan.
B Plug the connection wire.
B Turn ON the appliance.
C1? ↓5.
no: ↓5.
5. The PCB control board is damaged. B Make a note of the altered service settings (see
table 1, "First Service Level; Values that can be
modified" at page 8 and table 5, "Secondary
Service Level; Values that can be modified" at
page 11).
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.