Remove the proximity switch connector plug at X6 on the
control board.
Remove the proximity switch Heyco bush from the control box
and withdraw the electrical lead.
Close the mains water isolating valve located on the flow switch
inlet pipe and drain the residual water from the hot water
pipework.
Undo the nut connecting the flow switch to the domestic inlet
pipe assembly.
Undo the nut connecting the flow switch to the regulator
compression fitting.
NOTE: While undoing these nuts it is essential that the brass
section of the flow switch body is used for holding and not the
plastic moulding.
Pull the nuts back and extract the flow switch assembly.
Fit a new flow switch and new washers in the reverse order,
ensuring that the flow switch body is tilted up at an angle of
approximately 15 degrees with the plastic moulding towards
the boiler body.
To replace the flow restrictor (12/14 and 15/19 appliances
only), remove the flow switch body as described above.
The flow restrictor is now accessible in the end of the regulator
compression fitting.
Clean or replace the flow restrictor as required.
To gain access to the filter, undo the nut connecting the
domestic inlet pipe assembly and the isolating valve.
Remove the domestic inlet pipe assembly.
Clean or replace the filter as required.
Reassemble the components in the reverse order.
10. Automatic Air Vent
Check that the electrical supply has been turned off.
Remove the appliance front panel, top panel and withdraw the
burner to prevent water ingress.
Remove the electrical control box as described in Section 19.2 (11).
Drain the boiler and the heatslave tank..
Unscrew the automatic air vent and fit a new one in the reverse
order.
Fill the system as described in Section 16.
11. Electrical Control Box
NOTE:
It may be found easier to gain access to some
components such as the diverter valve by removing the
electrical control box as described here.
Check that the electrical supply has been turned off.
Remove the appliance front panel and top panel.
Remove the fire valve if fitted to the fire valve clip provided on
the back of the electrical control box.
Remove the control box top cover by removing the four self
tapping screws.
Unscrew the wing nut holding the electrical control box base
onto the support arm and remove the screw.
Remove the split pins and phial retaining plug from the boiler
and Heatslave tank thermostat phial pockets. Carefully
withdraw the thermostat phials ensuring that the copper
capillary tubes do not become kinked.
Slacken the two self tapping screws on the underside of the
electrical control box holding the facia panel in place.
Remove the three self tapping screws holding the facia panel
and electrical control box onto the side panels.
Unplug the burner electrical harness from the underside of the
control panel.
Carefully withdraw the control box and temporarily seat in a
suitable place such as the top of the boiler.
Reasemble the electrical control box in reverse order
12. Thermostats
Check that the electrical supply has been turned off.
Remove the appliance front, top panel.
Remove the electrical control box top cover by removing the
four self tapping screws.
CENTRAL HEATING CONTROL THERMOSTAT (See Fig. 3, 4, 5 & 6)
Remove the split pin from the thermostat phial pocket located
on the front, left hand side of the boiler.
Carefully withdraw the thermostat phial from the pocket.
Remove the heyco split bush and slide the copper capillary tube
through the slot, freeing the capillary tube from the electrical
control box.
Remove the spade connectors and note the terminal positions of
the various wires. See Fig 18.
Pull the thermostat control knob off the spindle and remove the
central clamping nut and washer.
Remove the thermostat and replace with a new one using the
reverse procedure.
With the thermostat in position, the excess capillary must be
coiled (without tight bends) and positioned so that it does not
come into contact with any hot surface.
When reassembling the split bush the slit should be positioned
opposite to the slot on the electrical control box.
The thermostat phial should be checked to ensure that it is clean
and free of any debris that would otherwise cause poor thermal
conduction when placed in the phial pocket. Ensure that the
split pin is replaced to prevent the phial springing free of the
pocket during operation.
DOMESTIC HOT WATER CONTROL THERMOSTAT (See Fig. 3, 4, 5 & 6)
The domestic hot water thermostat phial is located on the front
face of the Heatslave tank. In all other respects the removal
procedure is the same as the central heating control thermostat.
BOILER HIGH LIMIT THERMOSTAT (See Fig. 3, 4, 5 & 6)
The high limit thermostat phial is located in the same pocket as the
central heating control and manual reset overheat thermostat.
To remove the thermostat follow the same procedure as the
central heating control thermostat, but to remove the body from
the electrical control box, undo the two M4 screws located at
the rear of the panel.
NOTE: The high limit thermostat phial should be positioned in
the phial pocket between the manual reset overheat thermostat
and the central heating control thermostat phial.
MANUAL RESET OVERHEAT THERMOSTAT (See Fig. 3, 4, 5 & 6)
The manual reset overheat thermostat phial is located in the
same pocket as the central heating and boiler high limit
thermostat. To remove the thermostat follow the same
procedure as the central heating control thermostat.
Remove the heyco split bush and slide the copper capillary tube
through the slot, freeing the capillary tube from the electrical
control box.
Remove the electrical spade connectors and undo the securing
nut located on the underside of the electrical control box.
Remove the thermostat and replace with a new one using the
reverse procedure.
With the thermostat in position, the excess capillary must be
coiled (without tight bends) and positioned so that it does not
come into contact with any hot surface.
When reassembling the heyco split bush the slit should be
positioned opposite to the slot on the electrical control box.
The thermostat phial should be checked to ensure that it is clean
and free from any debris that would otherwise cause poor
thermal conduction when placed in the phial pocket.
NOTE: The manual reset overheat thermostat phial should be
positioned in the phial pocket before the high limit thermostat
phial and the central heating control thermostat phial.
13. Control Board
Check that the electrical supply has been turned off.
Remove the appliance front, top panel and the control box top
cover.
Remove the two screws holding the facia to the underside of the
electrical control box and the two screws holding the facia to the
side panels.
Remove the wires from terminals
X1 and X2 and unplug the
wiring harness connectors.
Gently prise back the support pillar locating tabs, one by one,
and pull the control board clear.
Withdraw the board from the control box.
36
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