Status of
indoor/
outdoor units
Indication
by LED on
outdoor
unit
Indication by operation lamp on indoor unit
Content of diagnosis
Main category
Sub-category
Inspection location/method
Remedy
Lighting pattern at the time of timer lamp lighting
Off for 5 seconds
Main
category
Sub
category
Malfunction No.
: Flashes in 2-sec intervals (normal) : On : Off : Flashes 3 times in 0.2-sec intervals
(1) Check the wires between units.
(2) Check voltage between Nos. 1 and 2 on
the indoor/outdoor unit terminal boards.
(1) Check the wires between units.
(2) Check the outdoor unit fuse.
(3) Check 15-V, 13-V and 5-V voltages on
the PWB.
Check resistance between IPM terminals.
(4)
Check pins No. 5 and 7 of connector CN3 of
the outdoor unit fan motor for short-circuit.
(5) Outdoor unit control PWB
(1) Check the wires between units.
(1) Connect stable power supply.
(2) Replace the outdoor unit control
PWB assembly.
(1) Correct the wiring.
(2) Replace the fuse or outdoor unit
control PWB assembly.
(3) Replace the outdoor unit control
PWB assembly.
(4) Replace the outdoor unit fan motor.
(5) Replace the outdoor unit control
PWB assembly.
(1) Correct the wiring.
(1) Check the wires between units.
(1) Correct the wiring.
Serial open circuit
Outdoor unit does
not turn on due to
erroneous wiring
Serial short circuit
Erroneous serial
wiring
Operation lamp
Cluster lamp
Operation lamp
Cluster lamp
Operation lamp
Cluster lamp
Operation lamp
Cluster lamp
Wires between
units
Wires between
units
Indoor unit in
operation
Outdoor unit
in temporary
stop
Indoor unit in
operation
Outdoor unit
in temporary
stop
(1) Check the AC power supply voltage
for fluctuation.
(2)
No abnormality found in above inspection
(1) Connect the connector.
(2) Replace the active filter.
PAM over voltage
Operation lamp
Cluster lamp
14 time
Indoor/
outdoor units
in complete
shutdown
14
17
18
*3: The content of diagnosis is transferred to the indoor unit via serial communication, but it does not trigger a complete shutdown operation. Number of repetition °: No complete shutdown
(1)
Check the indoor unit fan motor for proper
rotating operation. (Check for fan lock.)
(2) Check the lead wire of the indoor unit fan
motor for open-circuit.
(3) Check CN1 and CN5 of the indoor unit
fan motor for secure installation.
(4) No abnormality found in above inspec-
tions (1) through (3).
(1) Replace the indoor unit fan motor.
(2) Replace the indoor unit fan motor.
(3) Correct the installation of CN1 and
CN5 of the indoor unit fan motor.
(4) Replace the indoor unit control
PWB.
(1) Error in data read from the indoor unit
EEPROM
(1) Replace the indoor unit control
PCB.
Indoor unit fan er-
ror
EEPROM data
error
Operation lamp
Cluster lamp
Operation lamp
Cluster lamp
Indoor unit fan
Indoor unit
control PWB
Indoor/
outdoor units
in complete
shutdown
19
20
Indoor/
outdoor units
in complete
shutdown
error
Compressor
rotation error.
-0
-1
Outdoor unit
PAM
PAM clock
error
(1) Check the PAM clock for proper input.
(1) Replace thoutdoor unit control PWB
assembly.
-1
-0
Operation lamp
Cluster lamp
-0
-1
-0
-0
-2
Operation lamp
Cluster lamp
PAM voltage
error
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