Supplied By www.heating spares.co Tel. 0161 620 6677
18
5. SERVICING
To ensure reliable operation of your Aztec electric boiler,
it is recommended that you have your boiler serviced
once a year.
The person(s) who services or carries out any
remedial work, ie electrical fault finding, must have
suitable engineering qualifications.
Isolate mains supply before carrying out any service
work.
1. Check all electrical connections on PCB and electric
elements to ensure they are secure and clean
2. Check electrical insulation on wiring.
3. Inspect fan unit (9, 11 and 12kW boilers) and clean
away any deposits
4. Ensure all air grilles are clean and free from
obstructions.
5. Inspect seals around elements and also the heat
exchanger top and bottom flanges.
PCB ASSEMBLY REPLACEMENT
Note: The PCB is supplied with the element jumper fitted
suitable for 11kW and 12kW boilers.When fitted to a 6kW
or 9kW boiler, the element jumper must be removed. This
is not applicable to the 2kW unit.
1.
Ensure electrical supply is isolated to boiler.
2.
Remove the 4 fixing screws and washers (2 at top/2
at bottom), lift up the top-plate and carefully slide off
the front casing panel.
3.
Disconnect the Pump + Call plug, the Thermistor
plug and the fan (where fitted) and high limit stat.
plug.
4.
Disconnect all element cables apart from the rear
element. N.B. Take note of wiring arrangement
before disconnecting.
5.
Now remove the grey pipe insulation, it is now
possible to disconnect the remaining element.
6.
With all elements disconnected, again taking note of
wiring arrangement, carefully disconnect and remove
the element cables from the PCB.
Important: care MUST be taken when handling the PCB.
7.
Disconnect the remaining red + black power cables
from the PCB.
8.
For ease of access disconnect from the main terminal
block both the red + black cables and also the
power input cables, leaving the earth cable connected
9.
Free both the pump and call terminal blocks by
removing the terminal block fixing screws.
10. Now remove the fan cover from the LHS of the unit
by removing the 2 fixing screws situated just behind
the flow pipe.
11. Remove the fan from the back panel by removing the
2 fixing screws.
12. Now remove the screws which fasten the pipe
bracket/air duct to the aluminium heatsink.
13. Finally remove the 4 fixing screws holding the
heatsink in position and allow the PCB assembly to
drop down about an inch before removing from the
RHS of the unit.
14. Re-fit in reverse order _ on re-assembly always
refer to wiring diagram.
4 FIXING
SCREWS
PCB
CONTROL
UNIT
HEAT SINK
PLATE
FIXING SCREWS
TOP AND BOTTOM
PARTS REPLACEMENT
CASING REMOVAL
IMPORTANT
Isolate mains electrical supply to the boiler before carrying
out any maintenance work.
1.
Isolate electrical supply to boiler.
2.
Remove 4 fixing screws securing front casing in
position.
3.
Slide top casing upwards this will allow front casing
to slide forward.
IMPORTANT: All electrical connections should be
checked. Loose connections can cause problems.
This boiler is fitted with a manual reset high limit
thermostat. Before replacing any part, ensure that the
thermostat does not require re-setting.
FIG. 22
