Specifications

7 181 465 346 GB (03.02)
31
Failure identification procedure
5. Is lead disconnected from CH flow
safety temp. limiter?
yes: B Power OFF the appliance.
B Reconnect lead.
B Turn ON the appliance.
B Press , restart the appliance.
↓6.
no: ↓6.
6. B Power OFF the appliance.
B Disconnect lead to CH flow safety
temperature limiter.
B Measure the CH flow safety tem-
perature limiter.
R = ∞?
yes: B Change CH flow safety temperature limiter.
B Connect CH flow safety temperature limiter lead.
B Turn ON the appliance.
B Press , restart the appliance.
E9? ↓7.
no: B Connect CH flow safety temperature limiter lead.
B Turn ON the appliance.
↓7.
7. B Power OFF the appliance.
B Remove fuse SI 3 from appliance
PCB control board and test for
continuity.
R = ∞?
yes: B Change the fuse.
B Turn ON the appliance.
B Press , restart the appliance.
E9? ↓8.
no: B Remount the fuse.
B Turn ON the appliance.
↓8.
8. 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.
E9 and flashing.
Safety temperature limiter has tripped.
Check Action