LG LSC27931SB Service Manual page 56

2-5. Defrosting failure
Problems Causes
No defrosting. Heater does not generate heat as
the heating wire is cut or the circuit
is shorted.
1) Heating wire is damaged when
inserting into the evaporator.
2) Lead wire of heater is cut.
3) Heating wire at lead wire contacts
is cut.
Suction tube and discharge orifice:
1. Impurities.
2. Ice.
Gap between Suction duct and
Heater plate (Ice in the gap).
Wrong heater rating (or wrong
assembly).
Checks
1. Check the resistance of heater.
0 : Short. : Cut.
Tens to thousands : OK.
2. Check the resistance between
housing terminal and heater
surface.
0 : Short. : Cut.
Tens to thousands : Short.
1. Confirm foreign materials. In case 1) Push out impurities by inserting
of ice, insert the copper line
through the hole to check.
2. Put hot water into the drain
(check drains outside).
1. Confirm in the Suction duct.
1. Check heater label.
2. Confirm the capacity after
substituting the resistance value
into the formula.
V 2
(V: Rated voltage of user country)
P=
R
(R: Resistance of tester[? ])
Compare P and lavel capacity.
Tolerance: ±7%
Measures
Heating wire is short and wire is cut.
• Parts replacement: Refer to parts
explanations.
copper wire. (Turn off more than
3 hours and pour in hot water if
frost is severe.)
2) Put in hot water to melt down frost.
3) Check the water outlet.
4) Push the heater plate to suction
duct manually and assemble the
disconnected parts.
1) Turn off the power, confirm
impurities and ice in the gap, and
supply hot water until the ice in the
gap melts down.
2) Push the Heater plate to drain
bottom with hand and assemble
the disconnected parts.
Faults:replace.
- How to replace :
Refer to main parts.
Remarks
Seal the lead wire with
insulation tape and heat
shrink tube if the cut
lead wire is accessible to
repair.