Panasonic U-72MF2U9 Service Manual page 186

4. 2WAY Alarm Codes
3. 3WAY Alarm Codes
P05, P15 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
P14 Alarm
Alarm code
Alarm meaning
Alarm conditions
1
Probable cause
Check and
Correction
2
3
Example
4
Notes
P16, P26 Alarm
Alarm code
Alarm meaning
5
Alarm conditions
6
7
Probable cause
Check
8
Correction
Example
Notes
9
P05, P15
P05 : Open phase in power input is detected at HIC for 1st compressor.
P15 : Open phase in power input is detected at HIC for 2nd compressor.
This alarm occurs when open phase detected in the L1-L2-L3 phases.
Open phase in the L1-L2-L3 phases
Check the wiring at the power terminal board.
Switch the phases and reinsert. Check if the result is OK.
P14
Input detected at EXCT terminal on indoor PCB for refrigerant detector.
(1) It is judged an error whenever the outdoor unit receives the signal "O2 Alarm Generated"
from the indoor unit.
(2) With the indoor unit's EEPROM setting (item code 0B) set to 0001, the EXCT input was
shorted.
—
(1) System configuration
1-1 Is an O sensor being used?
2
(2) Indoor EEPROM setting
2-1 Is the EEPROM setting, item code 0B, on the indoor control board set to 0001?
(3) Indoor Unit Control board
3-1 Is the alarm triggered if the EXCT socket (wire) is disconnected, and the power is reset?
3-2 Since there is no error, see what happens.
3-3 Indoor Control board defective
—
—
P16, P26
P16 : Overcurrent of 1st compressor on the secondary side of inverter circuit, or inverter failed to
syncronize with rotation.
P26 : Overcurrent of 2nd compressor on the secondary side of inverter circuit, or inverter failed to
syncronize with rotation.
This alarm occurs when current trouble or current detection
trouble occur (when trouble judgement current is detected
in the secondary current).
* Changed to output error by current regardless of the inverter
frequency.
When more than the current values shown in the table are
instantly detected in the secondary current.
Secondary current
Type of outdoor unit 72
Current (A) 30.0
There is a strong possibility of a compressor failure.
An alarm occurs for current detection trouble when it is judged that no current is flowing after
start (DCCT is damaged). In this case, the cause is a DCCT failure.
Check the power wiring and connector wiring.
It is possible to resolve this trouble by limiting the maximum frequency.
—
—
If "Yes", see "3-1".
If "No", see "2-1".
If "Yes", change the setting of item code 0B to
"0000" from "0001".
If "No", see "3-1".
If "Yes", see "3-3".
If "No", see "3-2 ".
replace board
96 120 144
44.0 30.0 30.0
5 - 24
2WAY SYSTEM
3WAY VRF SYSTEM
Trouble Diagnosis
Trouble Diagnosis
U
V
W
HIC PCB
Inverter compressor