Stelrad Group Boiler CX.275

Turn OFF the gas supply at the inlet gas cock.

Switch OFF and DISCONNECT the electricity supply.

Remove Controls Box Front Panel

Remove controls box front panel as described in L.E.D. lights assembly.

Store the front panel in a suitable place.

Unplug the red and white wires from terminals 1 and 3 on the overheat thermostat.

Remove the earth wire from the bracket fixing screw.

Check that the system has been filled and properly vented

Ensure all drain cocks are closed and any stop valves in the flow and return mains are open

Is the electricity supply switched OFF?

Remove the jacket lower front panel

Is the gas supply turned ON at the meter?

Lift off the lower front panel from the boiler casing.

Remove the earth connection and the two push-on leads connecting the controls box to the overheat thermostat, if applicable.

Undo the four nuts securing the burner front plate.

Pull the front plate forwards at the top and lift it out.

Lift out the left and right hand burner after pushing them back to clear the injector.

Remove the thermocouple and pilot gas pipe connections at the gas valve to remove the centre burner.

Pull off the igniter lead at the igniter.

Turn OFF the gas supply at the inlet gas cock

Switch OFF and DISCONNECT the electricity supply

Remove the centre burner as previously described under Servicing

Unfasten the backnut retaining the electrode and remove

Undo the two screws securing the pilot burner assembly to the pilot burner bracket

Undo the thermocouple and pilot gas pipe connections at the pilot burner assembly

CAREFULLY remove the pilot burner

Turn OFF the gas supply at the inlet gas cock

Switch OFF and DISCONNECT the electricity supply

Remove the two screws and washers securing the control box to the side panels

Lift the control box off the locating hooks

Unfasten the two screws securing the plug-in electrical connectors to the rear of the control box