1. Turn off the electric power and gas supply to the combi boiler.
2. Ensure the combi boiler cools down. Do not drain the combi boiler unless freezing
conditions are expected during this procedure.
3. Remove the front cover, and then remove the four Torx 20 head screws on the top panel
of the combi 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. Undo the union nut at the gas valve outlet.
5.
Ensure that the O-ring and nut retainer are secured to the pipe.
6.
Undo the union nut connecting the gas valve outlet pipe to the mixer.
7.
Carefully remove the gas valve outlet pipe and gasket , and set aside for re-
installation.
8. Note the orientation and positions of the mixer's Philips head bolts.
9. Remove the Philips head bolts attaching the mixer to the fan, and set the mixer aside for
re-installation.
10.
Carefully remove the fan O-ring and note its position for re-installation.
11. Remove the electrical connection to the fan.
12. To remove the fan, unscrew the two nuts at the base of the fan, and retain for re-
installation.
13. Carefully lift and tilt the fan backwards to safely remove the fan from the heat exchanger
lid.
14. Remove the fan gasket.
15. Position the fan gasket (supplied in kit) onto the new fan, so that the holes align.
16. Secure the new fan onto the heat exchanger lid with the two nuts.
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.
19. Reassemble in reverse order.
7.3.2 Replacing the gas valve
1. Turn off the electric power and gas supply to the combi boiler.
2. Ensure that the combi 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 combi boiler.
Section: Service and maintenance
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