Symptoms And Parts To Inspect - Panasonic R410A Service Manual

Symptoms and Parts to Inspect

Remote
controller
alarm display
P03 Abnormal discharge
temperature error
• Discharge temp.
detected at or
above the specified
value
P05 CT disconnected
or AC power supply
error
P15 Insufficient gas level
detected.
5
L18 4-way valve locked
trouble.
• Judged after
operating for
5 minutes
consecutively
P04 High-pressure
protection error
P22 Outdoor unit fan
motor trouble
• Inverter protection
circuit was
activated, or lock
was detected at
outdoor unit fan
motor.
P29 Inverter protector
circuit was activated.
G-Tr short-circuit
within the HIC circuit.
(Short time / 0.8
seconds or less)
H31 HIC temperature
protection
Alarm
Judgement conditions
contents
Stops when temp. exceeds
106 .
Alarm output on 5 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 30 seconds to 5
minutes : Single alarm
• Discharge temperature is 95
or higher.
• Electronic expansion valve is at
Step 480.
When the above has continued
for 1 minute. Indoor air sucking
due to body thermostat max
(E1 or E2) - TA < 4
The indoor unit heat exchanger
temperature drops even though
the compressor is switched
on during the heating mode.
The indoor unit heat exchanger
temperature rises even though
the compressor is switched on
during cooling mode:
To +20 < E1
Pre-trip 1 time
High pressure switched
ON OFF
(Alarm is output when switch
opened.)
Inverter stops after alarm is
detected. Pre-trip 10 times
Inverter stops after alarm
is detected. Alarm is output
when inverter stops (pre-trip)
consecutively 10 times.
Pre-trip consecutively 10 times
Eliminating
condition of alarm
Recovery at restart
Recovery at restart
Recovery at restart
Recovery at restart
Recovery at restart
Recovery at restart
Recovery at restart
Temperature dropped
5-6
Judgement and correction
1. Check refrigerant cycle (gas
leak).
2.Trouble with electronic
expansion valve
3.Check discharge
temperature sensor (TD).
1. Check outdoor unit control
PCB.
2. Lack of reactor wire
1.Check refrigerant cycle (gas
leak).
2.Trouble with electronic
expansion valve
3.Check outdoor unit valve
opening.
1. Check 4-way valve.
2. Check 4-way valve wiring.
3. Check outdoor unit control
PCB.
Overload operation of
refrigerant cycle
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.
1.Stops immediately even
when operations restarted.
• Layer short on the
compressor
2.Check HIC circuit.
• Wiring trouble
Heat sink and PCB (HIC)
• Contact trouble