LiuGong CLG835H, Service Manual

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Fault Diagnosis and Judgment
January 24, 2017
Overhauling method CLG835H
Maintenance method when warm air or natural air comes out when refrigeration is switched on
P18A00035
ψ 0. 196 Mpa ϊ 0.23 Mpa
Heating or natural
air blowing under
cooling mode
Solenoid water valve
is stuck in the open
position, or circuit
problems cause the
solenoid valve start
to be powered.
Check the
refrigerant from
sight glass
Lots of bubbles
in sight glass
Check follow the
item 1 in the table
The compressor
is not working.
Measure whether
the connector of
compressor clutch
has electricity
Check
whether
there is the ground
connection of
compressor
housing
Check the
control panel
Pin #18 for
electricity
The refrigeration relay
on the evaporator
or its related lines
malfunctions
Check
whether
two wires of pins
No.6 and No.8 on
control panel are
conducted.
Pressure switch
wiring fault
Check the
high pressure of
refrigerant
Check whether the
pressure switch is
breakover/connected
Few refrigerant or
none refrigerant
Control panel fault
Repair and
make it
earthed well
Check the defrost
sensor for break circuit or
short circuit
Defrost sensor or its
circuit failure
Pressure switch or its
circuit failure
No Yes
No Yes
No Yes
No
Yes
No
Yes
No
Yes
No
Yes
Turn off
the water valve
connecting the warm
water pipe on the
engine, check for
malfunctions
Compressor
runs normally
Check
compressor
running
conditions
No air bubble can be
seen from the fluid in
spection mirror or only a
small amount can be seen
Connect the manifold
meter, measure pressures
at high and low pressure
ends, and compare them
with normal pressure (see
table attached hereinafter).
Check follow
the item 2 in the table
Replace the solenoid
water valve or check
the circuit
The electromagnetic
clutch coil is tripping
off and replace the
clutch or
the compressor