Heatrae Sadia ELECTROMAX Installation & Servicing Instructions Manual page 41

9.3.10 Removing the Electric Boiler Main
Control PCB
a. Remove cover from over the Electric
Boiler Control pcb (see Diagram 43,
page 39).
b. Disconnect cables from the terminal
blocks.
c. Unplug ribbon cable connector CONN
2.
d. Unplug the thermistor connector from
CONN 4. Unplug the over-temperature
cut-out connector from CONN 3.
e. Remove the pcb securing screws
(numbered 1 to 4 on Diagram).
f. Carefully remove the pcb assembly
from the Boiler pipework. This may
be stiff and gentle prising from the top
may be required.
g. Disconnect the cables from the Electric
Boiler element connections.
h. Replacement is a reversal of the
above procedure. Ensure the correct
element connections are made. The
element terminals are colour coded
to correspond with the same colour
connecting wires from the pcb, ensure
they are connected to the correct
elements. Ensure heat sink compound
is applied to the underside of the
heat sink. Refit the pcb tightening the
fixing screws in the order indicated
on Diagram 46. Ensure all electrical
connections are correctly made (refer
to wiring diagram 14, page 21) and
tightened fully. Loose terminations
can overheat and cause a fire
hazard.
9.3.11 Removing the 3 amp Panel
mouted fuses (see Diagram 47)
a. Remove fuseholder end cap from
control assembly using screwdriver.
b. Replace 3 amp fuse.
c. Replace fuseholder end cap.
Diagram 46 Electric Boiler Control PCB
Terminal Blocks
FS 1 T 2A 240V
3
CONN 2
4
Diagram 47 Replacement 3 Amp Fuse
Fuse
Fuse
Holder
Screw-
driver
Installation & Servicing Instructions
CONN 5
2
1
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