16. Insert the gas valve outlet pipe and venturi clip.
17. Reinstall the components in reverse order. Upon reassembly, ensure that all O-rings and
gaskets are correctly positioned.
18. Check for leaks at the gas valve outlet and at the connection point between the fan and the
heat exchanger lid.
7.3.2 Replacing the gas valve
1. Turn off the electric power and gas supply to the boiler.
2. Ensure that the boiler cools down to the surrounding temperature.
3. Remove the front cover, and then remove the four Torx 20 head screws on the top panel of the
boiler.
A ladder or step may be required to have a clear vertical view of the work area. Do not attempt to
reach from the front without a clear view, as damage to connectors, screws or refractory may
occur.
4.
Remove the electrical connection to the fan.
5.
Move the gas valve outlet tube away from the gas valve.
6. Unscrew the top union nut of the flexible pipe attached to the gas valve/ bracket. Retain the
gasket.
7. Push the flexible pipe to the side.
8. To remove the gas valve, undo the union nut at the gas valve outlet.
9. Carefully remove the O-ring and orifice for re-installation later.
10. Install the new gas valve, tightening the union nut on the gas valve outlet with the O-ring and
orifice in place.
11. Reinstall the components in reverse order. Upon reassembly, ensure that all O-rings and
gaskets are correctly positioned.
12. Before restoring the boiler to normal operation, check for leaks at the gas valve inlet .
13. With the boiler operating, check for leaks at the gas valve outlet.
14. Tune the gas valve. For instructions, see Adjusting the gas valve on page 64.
7.3.2 Replacing the gas valve
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