FAULT FINDING
37 FAULT FINDING
During normal operation (no fault having occured) one of the
following codes with the corresponding service code, will be
indicated on the display panel of the Maximiser SE
condensing boiler.
display code
service code
unit operating condition
P
Starting up the Control panel sequence
r
Restart of the Control panel sequence after a reset
c
Control panel sequence checks the unit data when starting up
d
Control panel sequence reads the unit data
0
A
Anti fast-cycle program in operation
0
H
Unit is stand-by; no heat required
0
L
Unit is in ignition phase
0
U
15 seconds ventilation phase before or after operation of the unit
0
Y
Water temperature higher than adjusted, unit is waiting
-.
H
Unit is in operation for central heating
2
F
This code can appear if the unit adjusts itself to the small amount of
water in the installation.
=.
H
Unit is in operation for hot water
39 FAULT DIAGNOSIS
By combining the display and service codes that are shown
with the unit and/or installation behaviour, the cause of the
malfunction can be found. Normally, the operating code is
indicated on the display. By pressing the “Service” button,
the service code will appear. In the following table the most
important combinations of codes and boiler behaviour are
shown. The numbers listed in the “causes” column refer to
frame 41. This table shows you how to find the cause of the
malfunction and how to solve the malfunction.
38 FUSE SPECIFICATION
Glass fuse position
F1 fuse =
igniter, 1.25 A slow, 250 V,
F2 fuse =
burner thermostat and control panel, 1.25 A
slow, 250 V,
F3 fuse =
three-way valve and control panel, 1.25 A slow,
250 V,
Fuse 1
Fuse 2
Fuse 3
20 Pin connector
18 Pin connector
Spare fuse
1
2
3
Ignitor connection
211080 UK
Maximiser SE
- Installation
30
