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3WAY SYSTEM
Trouble Diagnosis
4. 3WAY Alarm Codes
P14 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check and
Correction
Example
Notes
P14
O
2
sensor operation
(1)
1-1
System configuration
Is an O
2
sensor being used? 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 ”.
(2)
2-1
Indoor EEPROM setting
Is the EEPROM setting, item code 0B, on the indoor control board set to 0001?
(3)
3-1
EXCT wiring
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
replace board
—
—
(1) It is judged an error whenever the outdoor unit receives the signal “O
2
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.
—
P16 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
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).
*
When more than the current values shown in the table are
instantly detected in the secondary current.
Changed to output error by current regardless of the inverter
frequency.
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.
—
—
Inverter compressor
HIC PCB
U
V
W
Secondary
current
Horsepower of unit
Secondary current
Current (A)
8HP
20.6
10HP
21.8
12HP
21.0
14HP
22.5
16HP
22.5
5/A9#;'%1K5;56'/A5G
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