Panasonic U-8MF2E8 Service Manual page 146

4. 3WAY Alarm Codes
P14 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check and
Correction
Example
Notes
P16 Alarm
Alarm code
Alarm meaning
Alarm conditions
5
Probable cause
Check
Correction
Example
Notes
P14
O sensor operation
2
(1) It is judged an error whenever the outdoor unit receives the signal "O
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) EXCT wiring
3-1 Is the EXCT socket (wire) shorted?
(4) Indoor control board
4-1 Is the alarm triggered if the EXCT socket (wire) is disconnected, and the power is reset?
4-2 Since there is no error, see what happens.
4-3 Indoor control board defective
—
—
P16
Compressor 1 (INV) overcurrent alarm
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
Horsepower of unit 8HP
Current (A) 20.6
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", see "3-1" after modification.
If "No", see "4-1".
If "Yes", Modify the wiring.
If "No", see "4-1".
If "Yes", see "4-3".
If "No", see "4-2 ".
replace board
10HP 12HP 14HP 16HP
21.8 21.0 22.5 22.5
5 - 24
3WAY SYSTEM
Trouble Diagnosis
Alarm Generated"
2
U
V
W
HIC PCB
Inverter compressor