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outlet connections and lift the heat exchanger clear.
Replace the heat exchanger and re-assemble in reverse
order.
14.5 Igniter Unit
Pull off the two wires from the rear of the unit, unscrew
the plastic retaining nut on the control panel and push
out the Piezo unit.
Replace and re-assemble in reverse order. (fig. 22).
14.6 Water Valve
Isolate the appliance from the incoming cold water supply
and drain down the appliance via the fitted drain cock.
Undo the inlet water connection at the base of the
combustion chamber and at the water valve inlet.
Slacken the two screws between the water valve and
gas valve and pull the water valve clear.
The diaphragm within the valve can be replaced by
removing the five fixing screws holding the valve body
together.
Pull out the water filter fitted into the incoming cold water
tapping. Clean or replace as necessary.
Re-assemble in reverse in order. (fig. 22).
14.7 Gas Valve
Remove the water valve as described in Section 14.6.
Disconnect the pilot gas pipe and thermocouple from
the gas valve.
Pull off the two cables from the rear of the igniter unit.
Release the main gas pipe union connection below the
combustion chamber and lift the valve clear complete
with the control panel.
Remove the Piezo unit as described in Section 14.5.
Remove the control facia by taking out the four fixing
screws and lifting clear complete with slider knob.
Prise out the slider bar and remove the two screws
retaining the control frame and lift clear.
Replace the gas valve and re-assemble in reverse order.
Fig. 22
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