Stelrad Group Boiler CX.205

Turn off the gas supply at the inlet gas cock.

Switch off and disconnect the electricity supply.

Remove the push-on tags and earth connection on the overheat thermostat body, noting their position.

Undo the two screws retaining the thermostat/piezo igniter bracket to the gas valve.

Undo the two screws retaining the thermostat.

Remove the retaining clip from the thermostat pocket and remove the overheat thermostat phial.

Turn OFF the gas supply at the inlet gas cock

Switch OFF and DISCONNECT the electricity supply

Remove Controls Box Front Panel

Undo the two screws securing the controls box front panel

Lower the front panel to clear the location pegs

Pull the front panel away from the controls box

Unplug the potentiometer lead a-pin socket and the two leads from printed circuit board No. 5 off circuit board No. 1 and the L.E.D lights plug off board No. 3

Place the front panel on a suitable work surface

Turn off the gas supply at the inlet gas cock

Switch off and disconnect the electricity supply

Remove Main Boiler Thermostat Sensor

Remove the retaining clip from the thermostat pocket

Disconnect the two push-on leads connecting the controls box to the overheat thermostat

Remove the two screws securing the controls box to the side panels

Check that the system has been filled and properly vented

Ensure all drain cocks are closed and stop valves are open

Is the electricity supply switched OFF?

Remove the jacket lower front panel

Is the gas supply turned ON at the meter?

Ensure the system is cold and on full load with all temperature controls set at maximum.

Remove the screw in the manifold setting pressure test nipple and connect a suitable gas pressure gauge.

Light the boiler and allow it to operate for about fifteen minutes to stabilize the burners.

Check the manifold gas pressure.

Adjust the pressure to the figure shown in Table 1 for the appropriate boiler size.

Remove the dust cover over the adjuster.

Using a small screwdriver, turn the screw beneath clockwise to increase or anti-clockwise to decrease pressure.