42
Installation and Servicing
Section 3 - Servicing
SER
VICING
3.16 PRIMARY PCB REPLACEMENT
1. Carefully release the four retaining clips and remove
control box cover.
2. Unplug all lead connections to the PCB.
3. Spring out the four side retaining clips and pull the PCB
upwards to clear the corner retaining posts.
4. Fit the new PCB and re-connect all plug connections.
5. Reassemble in reverse order.
6. Switch mains power on, wait for “
u
P
” to be shown.
7. Simultaneously press Mode & Restart buttons so that “
o
F
”
is shown.
8. Switch mains power off and wait for 5s.
9. Switch mains power on, wait for “
F9
” to be shown.
10. Rotate the temperature knob until “
F9 SU
” is shown.
Restart.
11. Rotate the temperature knob until “
F9
n” is shown.
Restart.
12. Rotate the temperature knob until the appropriate boiler
output is shown (15 kW, 18 kW, 24 kW or 30 kW).
13. Press Restart.
14. The boiler type (SU), gas type (n), output (15/18/24/30)
and parameter set number will be shown in rotation. If
this is OK press Restart to complete the configuration,
otherwise switch mains power off to start again.
15. Check that the boiler operates.
1
3
Refer to Section
3.2
1
COMBI
HEA
T / SYSTEM
SL1
L
IN
L
IN
SL2
OPTIONAL
FROST STAT
ROOM
STAT/
TIMER L N
MAINS IN
UIN
230010 A01
L N
MAINS IN
WARNING:
It is critical that the correct boiler size
and fuel type is entered in to the boiler.
CAUTION:
Fit the earth strap provided with the PCB
to your wrist and secure to a suitable earth on the
boiler chassis.
3.17 CONDENSATE TRAP REPLACEMENT / CLEANING
Refer to Section
3.10