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Replacing a bulb
• Remove the lid from the bulb box, remove the faulty bulb and replace with a new bulb. Do not touch the
bulb with bare fingers, as this will reduce the life of the bulb. Use clean tissue paper or similar to hold
the bulb.
• Check that the bulb is seated correctly on the contacts.
• Replace the top of the bulb box, locating it onto the pins provided.
Replacing a bulb temperature limit thermostat
• The bulb temperature limit thermostat can only be replaced as a complete lamp holder unit as follows.
• Disconnect the power supply from the lamp holder at one side of the holder and the limit thermostat and
withdraw the lamp holder from the lamp box.
• Replace with a new lamp holder assembly, locating it onto the pins provided.
• Ensure the wires are connected correctly.
Replacing the control thermostat
• Pull off the electrical connections from the thermostat body, noting the termination positions on the
body.
• Pull off the control knob from the spindle.
• Remove the two fixing screws and lower the thermostat.
• Withdraw the thermostat phial from the pocket located on the side of the boiler flow pipe.
• Withdraw the thermostat and capillary from the boiler.
• Replace in reverse order taking care to route the capillary away from any electrical connections and that
the electrical connections to the thermostat body are arranged as the original.
Replacing the overheat thermostat
• Pull off the electrical connectors from the thermostat body.
• Remove the locknut securing the thermostat body to the lower casing panel and lift the thermostat from
its mounting position.
• Remove the phial from the pocket on the side of the boiler flow pipe and withdraw the thermostat and
capillary from the boiler.
• Replace in reverse order taking care to route the capillary away from any electrical connections.
Replacing the circulating pump
• Isolate the pump using the valves at each side of the pump or the appliance isolation valves on the flow
and return connections to the boiler.
• Disconnect the plug and socket connection in the pump electrical supply.
• Remove the pump from the pipe work.
• Refit a replacement pump in reverse order ensuring it is pumping in the correct direction and the
electrical wiring is correct.
• Open the isolation valves, ensure the system cold fill pressure is correct, there are no water leaks and the
system is correctly vented of all air.