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CAUTION: TURN OFF THE GAS SUPPLY AND ISOLATE THE MAINS
SUPPLIES BEFORE STARTING ANY WORK AND OBSERVE ALL
RELEVANT SAFETY PRECAUTIONS.
IMPORTANT: AFTER REPLACEMENT OF ANY COMPONENTS ALWAYS
CHECK FOR GAS SOUNDNESS WHERE RELEVANT AND CARRY OUT
FUNCTIONAL CHECKS AS DESCRIBED IN COMMISSIONING.
ANY O-RING OR GASKET THAT APPEARS DAMAGED MUST BE
REPLACED.
REPLACEMENT OF PARTS
1. Removing outer case
1.1 Undo 4 screws (A) securing boiler casing.
1.2 Pull case forward and remove.
To remove bottom tray, pull forward on the
tag on the underside of the tray.
2. Primary sensor
Remove electrical connection (B) by pulling
upwards. Squeeze retaining clip on plastic
moulding (C) and pull sensor (D) upwards
until clear of pocket in heat exchanger.
Coat new sensor with heat conductive
paste and replace.
3. Overheat thermostat
Remove two electrical connectors from
thermostat.
Slacken and remove fixing screw and
thermostat.
When replacing ensure thermostat sits
correctly on surface of the casting with the
left hand side of thermostat siting up
against the shoulder.
NOTE: It is essential that the mating surface of
the thermostat is coated with heat conductive paste.
4. Flue overheat thermostat
Remove electrical connections.
Unscrew thermostat from flue.
The following components can be
replaced with the outer case
removed:
Primary sensor
Overheat thermostat
Flue limit thermostat
A
1.1
2
1.2
A
3
4
B
D
C
REPLACEMENT OF PARTS
INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior
8 716 107 336b (11/05)
41
SERVICING
& SPARES