Bosch Appliances 28i junior Replacement Of Parts, Removing outer case, Primary sensor, Servicing

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.

1.1 1.2

A

A

REPLACEMENT OF PARTS

1.Removing outer case

1.1Undo 4 screws (A) securing boiler casing.

1.2Pull case forward and remove.

To remove bottom tray, pull forward on the

tag on the underside of the tray.

The following components can be replaced with the outer case removed:

Primary sensor Overheat thermostat Flue limit thermostat

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.

2

B

C D

3

SERVICING & SPARES

4

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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.

REPLACEMENT OF PARTS

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR 24 i junior/28 i junior 8 716 107 336b (11/05)