Supplied By www.heating spares.co Tel. 0161 620 6677
Before commencing any service operation, ISOLATE the
mains electrical supply, and TURN OFF the gas supply at the
main service cock. It is the law that any service work must be
carried out by registered personnel [C.O.R.G.I.].
Following the replacement of any components the appliance
should be re-commissioned as detailed in section 4.
8.1
AIR PRESSURE SWITCH
– Remove the casing by unscrewing the retaining screws at
bottom rear of the appliance and pulling the panel
forwards, lifting it off the two pins at the top two corners.
– Disconnect the three wires from the air pressure switch,
noting their position.
– Pull off the two sensing tubes.
– Unscrew the two screws retaining the air pressure switch
and its bracket and remove the assembly.
– Remove the air pressure switch from its mounting
bracket, 2 screws.
– Replace the air pressure switch and re-assemble in rever-
se order. Ensure the sensing tubes and electrical connec-
tions are correctly fitted.
8.2
LIMIT THERMOSTAT
– Remove the casing by unscrewing the retaining screws at
bottom rear of the appliance and pulling the panel
forwards, lifting it off the two pins at the top two corners.
– Disconnect the two wires from the thermostat.
– Unscrew the thermostat from the manifold.
– Replace the thermostat and re-assemble in reverse order.
8.3
CONTROL TEMPERATURE SENSOR
– Remove the casing by unscrewing the retaining screws at
bottom rear of the appliance and pulling the panel
forwards, lifting it off the two pins at the top two corners.
– Disconnect the two wires from the control sensor.
– Unscrew the control sensor from the manifold.
– Replace the control sensor and re-assemble in reverse
order.
8.4
IGNITION CONTROL BOX
– Remove the casing by unscrewing the retaining screws at
bottom rear of the appliance and pulling the panel
forwards, lifting it off the two pins at the top two corners.
– Unscrew the screw retaining the cover of the control box,
unplug the connector and remove the control box.
– Replace it and re-assemble in reverse order.
8.5
ELECTRONIC PCB
– Remove the casing by unscrewing the retaining screws at
bottom rear of the appliance and pulling the panel
forwards, lifting it off the two pins at the top two corners.
– Remove the cover of the control panel by unscrewing the
rear screw, lift it off the two front pins and turn upside-
down to gain access to the electronic PCB.
– Unplug the connectors and remove the PCB by
unscrewing the retaining screws.
– Replace the electronic PCB and re-assemble in reverse
order.
8.6
GAS VALVE
– Remove the casing by unscrewing the retaining screws at
bottom rear of the appliance and pulling the panel
forwards, lifting it off the two pins at the top two corners.
– Remove the cover of the control panel by unscrewing the
rear screw, lift it off the two front pins to gain access to
the screws blocking the lower support of the control panel;
unscrew them to remove the control panel.
– Remove the ignition control box from the gas valve, 1
screw.
– Close the gas cock under the gas valve; disconnect it from
the valve (4 screws) and disconnect the pipe connecting
the gas valve to the sealed chamber (4 screws).
– Replace the gas valve and re-assemle in reverse order.
8.7
MAIN BURNER
– Remove the casing by unscrewing the retaining screws at
bottom rear of the appliance and pulling the panel
forwards, lifting it off the two pins at the top two corners.
– Remove the 4 fixing screws securing the sealed chamber
front panel then remove the panel.
– Unscrew the 2 screws securing the combustion chamber
front panel and remove the panel, taking care not to dama-
ge the insulation.
– Remove the red ignition control box from the gas valve, 1
screw.
– Unplug the ignition and detection leads from the ignition
20
8
REPLACEMENT OF PARTS
Fig. 20
1
2
4
3
HOW TO REMOVE THE CASING
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