Supplied By www.heating spares.co Tel. 0161 620 6677
7 181 465 347 (05.01)
20
Rectifying faults
Error A8
A8
flashing.
No correct electrical connection
Check
Action
1.
B
Power OFF the appliance.
B
Check Wiring between Textdis-
play and TR 2:
– Terminal 3 on Textdisplay con-
nected to Terminal 3 TR 2?
– Terminal 4 ...Terminal 4
– Terminal F ...Terminal F?
yes:
↓
2.
no:
B
Rewire correctly as specified in the installation
instructions.
B
Turn ON the appliance.
After 90 sec.:
A8?
B
Power OFF the appliance.
↓
2.
2.
B
Check continuity on wiring to TR 2.
Is there continuity?
yes:
↓
3.
no:
B
Replace or repair wiring and/or connections.
B
Turn ON the appliance.
After 90 sec.:
A8?
B
Power OFF the appliance.
↓
3.
3.
B
Check resistance from connections
4 to F and 3 to 4.
Is resistance between XX and XX?
yes:
B
Replace TR 2.
no:
↓
4.
4.
The PCB control board is damaged.
B
Make a note of the altered service function set-
tings (see table 1 on page 7) in order to keep
the altered values.
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.
