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5-3. Symptoms and Parts to Inspect
Remote
Alarm
controller
contents
alarm display
P03
Abnormal discharge
temperature error
• Discharge temp.
detected at or
above the specifi ed
value
P05
CT disconnected
or AC power supply
error
P15
Insuffi cient gas level
detected.
P19
4-way valve locked
trouble.
• Judged after
5 minutes had
elapsed since the
compressor was
switched on.
P20
High-pressure
protection error
caused by cooling
high-load max (C1,
C2) temperature
P22
Outdoor unit fan
motor trouble
• Inverter protection
circuit was
activated, or lock
was detected at
outdoor unit fan
motor.
P26
Inverter protector
circuit was activated.
G-Tr short-circuit
within the HIC circuit.
(Short time / 0.8
seconds or less)
HIC temperature
protection
Judgement conditions
Stops when temp. exceeds
111
.
Alarm output on 4 pre-trips
The current value transmitted
from the microcomputer on the
outdoor unit control substrate is
low.
When no AC power input for
more than 3 minutes: Pre-trip 5
times
• Discharge temperature is 95
or higher.
• Electronic expansion valve is at
Step 480.
• The current value from the
MDC is 2.0A or less.
When the above has continued
for 1 minute.
The indoor unit heat exchanger
temperature drops even though
the compressor is switched
on during the heating mode.
[min(E1,E2)] is 10
or lower.
The indoor unit heat exchanger
temperature rises even though
the compressor is switched on
during the cooling mode.
E2 is 50
or higher Pre-trip 2
times
Halted if the temperature
exceeds "a"
.
"a"=64 : Model 256, 366
"a"=61 : Model 486
Error output on 10 consecutive
pre-trips.
Inverter stops after alarm is
detected. Pre-trip 4 times
Inverter stops after alarm
is detected. Alarm is output
when inverter stops (pre-trip)
consecutively 4 times.
5-5
Eliminating
Judgement and correction
condition of alarm
Recovery at restart
1. Check refrigerant cycle (gas
leak).
2.Trouble with electronic
expansion valve
3.Check discharge
temperature sensor (TD).
Recovery at restart
Check outdoor unit control
PCB.
Recovery at restart
1.Check refrigerant cycle (gas
leak).
2.Trouble with electronic
expansion valve.
3.Check outdoor unit valve
opening.
Recovery at restart
1. Check 4-way valve.
2. Check 4-way valve wiring.
3. Check outdoor unit control
PCB.
Recovery at restart
1.Overload operation of
refrigerant cycle.
2.Check outdoor unit heat
exchanger temperature
sensor C1 and C2.
Recovery at restart
1.Position detection trouble.
2.Outdoor unit fan motor over-
current Protection circuit is
activated.
• Check outdoor unit control
PCB.
• Refer to outdoor unit fan
judgement methods.
Recovery at restart
1.Stops immediately even
when operations restarted.
• Layer short on the
compressor
2.Check HIC circuit.
• Wiring trouble
Temperature dropped
3.Heat sink and PCB (HIC)
• Contact trouble
5
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