Removal And Replacement Of The Lcd Display - Heatrae Sadia Multipoint ECO 100L V 3kW Installation, Operation And Maintenance Manual

9.3 Removal and Replacement of the LCD
Display
DANGER
The LCD Printed Circuit Board (PCB) has
240V ~ applied during operation. When
handling the PCB, extreme care should be
taken. During the removal or replacement
of the LCD display ensure that the electical
power is isolated to the water heater.
CAUTION

During the following procedures, ensure that the
water heater is wired to the electrical power source for
earth continuity.
Removal
Isolate the electrical power to the water heater at
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the fused spur.
Open the cover to the immersion heater housing.
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Remove the securing screw then release the cover
by carefully inserting a flat bladed screwdriver into
the slots around the cover and gently levering
outwards until the catches release (see Figure 10,
page 25).
To remove the LCD display, using a flat bladed
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screwdriver into the slots around the cover and
gently levering outwards until each of the four
catches release (see Figure 11, page 26).
Using an appropriate 'tested' ESD wrist strap with
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a crocodile clip at the opposite end of the lead to
the wrist strap, connect the crocodile clip onto the
earth point on the immersion heater (see Figure
12, page 26).
Gently pull the LCD and moulding assembly away
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from the water heater. Turn the assembly over.
Gently remove the ribbon cable attached to the
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back of the LCD Printed Circuit Board, by pulling
the ribbon cable plug out of the PCB socket.
Replacement
The replacement of the LCD Display is the reversal
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of the removal, as follows;
Using an appropriate 'tested' ESD wrist strap with
`
a crocodile clip at the opposite end of the lead to
the wrist strap, connect the crocodile clip onto the
earth point on the immersion heater (see Figure
12, page 26).
26
Figure 11: Cover removal
Remove the LCD and moulding assembly from the
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ElectroStatic Discharge (ESD) protective bag.
Align the ribbon cable plug and PCB socket,
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observing the correct orientation, then gently press
the plug into the socket. Note, the plug will fit only
one way around.
Align the LCD and moulding assembly with the
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clips, ensure that there is no risk of the ribbon cable
being trapped. Push any excess ribbon cable into
the tube that it travels through.
Gentle push on the moulding over each clip feature
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in turn ensuring an audible 'click is heard.
Visually inspect the cover to ensure that is clipped
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onto the water heater correctly.
If all other scheduled servicing has been completed,
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switch the electrical power back on.
Visually check that the display is powered correctly
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and that the buttons operate correctly
8, Operation, page 16).
Figure 12: Earth post location
(see Section