Panasonic R410A Service procedures, Alarm, Judgment condition, contents, Clear condition

Remote	Alarm
controller		Judgment condition
	contents
alarm display
P29	Current detection	Inverter stops after alarm is
	circuit trouble	detected. Alarm is output
	• AC current value is	when inverter stops (pre-trip)
	high even when	consecutively 4 times.
	compressor is
	stopped.

		4. Service procedures
Clear condition	Judgment and correction
Recovery at restart	1. Stops immediately when
	restarted.
	• Layer short in the
	compressor
	2. Check inverter control PCB.
	• Wiring trouble

F04

4

F06

F07

F08

Compressor motor output trouble, Inverter compressor trouble,

MDC trouble

Compressor does not run. (Overcurrent protection circuit activates after a certain period of time following compressor start.)

Compressor breakdown

•Starts to operate but operating frequency drops and compressor stops.

Inverter control PCB position detection circuit trouble

Disconnection, open circuit, or short circuit in discharge temp. sensor (TD)

Disconnection, open circuit, or short circuit in outdoor heat exchanger temp. sensor (C1)

Disconnection, open circuit, or short circuit in outdoor heat exchanger temp. sensor (C2)

Disconnection, open circuit, or short circuit in outdoor air temp. sensor (TO)

Inverter stops after alarm is detected.

Inverter stops after alarm is detected.

Inverter stops after alarm is detected.

Inverter stops after alarm is detected.

26, 36 MODEL:

Sensor detection trouble (194°F or higher when 15 minutes have elapsed after compressor stopped). (Open circuit)

42 MODEL:

Sensor defection trouble (194°F or higher when 60 minutes have elapsed after compressor stopped). (Open circuit)

Open circuit or short circuit

Open circuit or short circuit

Open circuit or short circuit

Recovery at restart 1. Refrigerant cycle trouble, overload operation

2.Loose screws and contact failure between HIC control PCB and radiating plate

3.Cooling failure of radiating plate

4.Check outdoor unit PCB wiring.

Recovery at restart 1. Compressor trouble (locked,

etc.)

•Replace the compressor.

2.Compressor wiring trouble (missing phase)

Recovery at restart 1. Check power voltage: AC 203 V ± 20 V or 230 V ± 23 V.

2.Refrigerant cycle overload operation

3.Check AC current detection circuit.

Recovery at restart Position detection circuit is activated even when the compressor 3P connector is disconnected and the compressor operated.

•Replace the inverter control PCB.

Automatic recovery 1. Check discharge temp. sensor (TD).

2.Check outdoor unit control PCB.

Automatic recovery 1. Check outdoor heat exchanger temp. sensor (C1).

2.Check outdoor unit control PCB.

Automatic recovery 1. Check outdoor heat exchanger temp. sensor (C2).

2.Check outdoor unit control PCB.

Automatic recovery 1. Check outdoor air temp. sensor (TO).

2.Check outdoor unit control PCB.

F12

Disconnection, open	Open circuit or short circuit
circuit, or short circuit
in intake temp. sensor
(TS)

Automatic recovery 1. Check intake temp. sensor (TS).

2.Check outdoor unit control PCB.

4-6