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INSPECTION AND SERVICE
Setting Boiler to Maximum.
NOTE: When running in the service mode, the
boiler will operate both the Central Heating and
DHW circuits. This is to allow sufficient time for
the setting procedure.
It will be necessary to run water through the
DHW circuit to ensure that the boiler will not
cycle on low heating demands.
A - On/off button
B - On/off and fault indicator (BLUE)
C - Central heating temperature control
D - Burner indicator (GREEN)
E - Reset button
F - Service button
G - ECO button
H - System pressure gauge
I - Cover or optional programmer
1 Press and HOLD service button (F) for 10
seconds and set Central Heating temperature
to maximum.
• The service button will illuminate continually
and the blue power indicator will flash quickly.
• The boiler will stay in this mode for 15
minutes unless the service button is pressed
again.
2 Pull the cover off and connect a manometer
to the fan pressure test point.
After measurement replace test point cover.
Pressure will read negative and be greater than:
Natural gas LPG
24i junior - 3.1 mbar 24i junior - 3.6 mbar
28i junior - 3.9 mbar 28i junior - 4.6mbar
• Pressures measured below these figures
will indicate that the heat exchanger will
require cleaning.
There is a special accessory kit available
specifically designed for cleaning the
heat exchanger. If required order
7 716 192 312.
1
A
D
F
C
B
G
E
H
I
2
INSPECTION AND SERVICE
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior
8 716 107 336b (11/05)
37
SERVICING
& SPARES