– 43 –
Table 9-2-3
Block level Diagnosis function
Check
code
Block
Check
code
Symptom
Air
Conditioner
status
Condition
Judgment and action
Thermo. sensor
short/break.
Continued
operation
Indicated when
detected abnormal
1.Check thermo. sensor.
2.If it is OK, check P.C. board.
Heat exchanger
sensor
short/break.
Continued
operation
Indicated when
detected abnormal
1.Check heat exchanger
sensor.
2.If it is OK, check P.C. board.
Indoor fan lock,
abnormality of
indoor fan or
thermal fuse break.
All off Indicated when
detected abnormal
1.Check heat thermal fuse is
blow or not?
(Terminal block part.)
2.
If the thermal fuse is not
blow, check indoor fan
motor.
(Refer to trouble shooting
flow charts.)
Indoor
P.C. board
Abnormality of
other indoor unit
P.C. board.
All off Indicated when
detected abnormal
Replace P.C. board.
Cable
connectio
n/Therm
al fuse
Refrigera
nt system
1) Wrong wiring or
disconnection of
connective
cable.
2) Thermal fuse cut
off.
All off Indicated when
detected abnormal
1. Check connective cable
correct if wiring is wrong.
2. Check thermal fuse and
Terminal blocks.
3.
If it is OK, check P.C. board.
1) Overload relay
or thermostat for
compressor
break.
All off Indicated when
detected abnormal
1. If overload relay and
themostat for compressor
are OK, check refrigerant
cycle.
2.
If refrigerant cycle is OK,
check P.C. board.
3.
If heat exchenger sensor is
OK, check overload relay
and thermostat for
compressor.
Compressor break
down.
All off
Indicated when
detected abnormal
1. Check compressor.
2. If it is OK, check P.C.
board.
Contents detected by the check codes “ ” to “ ” are stored in memory of the microcomputer even if the power supply
is turned off. Therefore, contents of operations in the past are all displayed.
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