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2WAY SYSTEM
Trouble Diagnosis
6
3. 2WAY Alarm Codes
2WAY VRF SYSTEM
Trouble Diagnosis
3. 2WAY 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 Is an O
2
sensor being used?
System configuration
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”.
(2)
2-1 Is the EEPROM setting, item code 0B, on the indoor control board set to 0001?
Indoor EEPROM setting
(3)
3-1 Is the alarm triggered if the EXCT socket (wire) is disconnected, and the power is reset?
Indoor control board
3-2 Since there is no error, see what happens.
3-3 Indoor control board defective
replace board
—
—
(1)
(2)
It is judged an error whenever the outdoor unit receives the signal “O
2 Alarm Generated” from the
indoor unit.
With the indoor unit's EEPROM setting (item code 0B) set to 0001, the EXCT input was shorted.
—
P16, P26 Alarm
Alarm code
Alarm meaning
Alarm conditions
Probable cause
Check
Correction
Example
Notes
P16, P26
P16 : Compressor 1 overcurrent alarm
P26 : Compressor 2 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.
(1) Power supply voltage malfunction
(2) Wiring failure (connection failure, miswiring)
* Wiring between HIC PCB and compressor
(1) Check the power supply voltage.
Check whether the voltage between each of the phases is correct while the compressor is running.
(It is necessary to check the compressor while running because the voltage may decrease when the
compressor starts running.)
(2) Check the wiring.
Check whether the following wiring is missing, connection failure or miswiring (position of U, V, W is
properly placed).
・ Wiring between HIC PCB and compressor
・ HIC PCB side
・ Compressor side
(1) Correct the power supply voltage.
(2) Correct the wiring.
(3) Replace the HIC PCB.
—
—
Capacity of unit
Secondary current
Current (A)
8HP
22.8
10HP
22.8
12HP
24.3
14HP
21.0
16HP
21.0
18HP
24.3
20HP
24.3
SM830237-02_北米向け2WAY_VRF.indb 23 2015/09/08 13:06:28
Inverter compressor
HIC PCB
Secondary
current
3WAY SYSTEM
Trouble Diagnosis
4. 3WAY Alarm Codes
P04 Alarm
Alarm code
Alarm meaning
High-pressure switch activated.
(1)
High-pressure switch failure or wiring connection failure
(2)
Failure to open the service valve of the outdoor unit
(3)
Difference of characteristics of high-pressure sensor
(4)
Clogging of the outdoor heat exchanger during cooling
(5)
Air short circuit occurs during cooling.
(6)
Failure of the outdoor fan during cooling
(7)
Clogging of the air filter in the indoor unit during heating
(8)
Air short circuit occurs during heating.
(9)
Failure of the indoor fan during heating
(10)
Clogging of the refrigerant circuit
(11)
Failure of the expansion valve
(12)
Failure of the solenoid valve kit
(13)
Too much refrigerant has been charged.
(1)
High-pressure switch failure or wiring connection failure
Check under the section 6. "Inspection and Characteristics of Parts (1) High-pressure switch".
(2)
Failure to open the service valve of the outdoor unit.
Check open/closed status of the outdoor unit service valve.
(3)
Difference of characteristics of high-pressure sensor
(4)
During cooling, check whether the outdoor unit heat exchanger is clogged. Remove any foreign material that
prevents ventilation.
(5)
During cooling, check whether an air short blockage has occurred in the outdoor unit. The system is
operating normally unless the temperature around the outdoor unit is excessively high.
(6)
During cooling, check for outdoor fan failure. Check whether the screws securing the fan are loose and
whether the fan connector in the outdoor unit PCB is properly connected.
(7)
During heating, check whether the air filters in the indoor unit are clogged. If clogged, clean the filters.
(8)
During heating, check whether an air short blockage has occurred in the indoor unit. The system operates
normally unless the temperature around the indoor unit is excessively high.
(9)
During heating, check for indoor fan failure.
(10)
Check whether the refrigerant circuit is clogged. Check that all service valves are closed.
Check whether welded locations are clogged.
(11)
Check for expansion valve failure. Check whether the expansion valves make a clattering sound when the
power is reset. Since the expansion valve in the indoor unit is in a location that makes aural inspection
difficult, use an electric means to check. Check that the connector pin of the expansion valve on the PCB
outputs 4 V. In addition, check that the coil resistance of the expansion valve is several tens of Ohm ( Ω ).
(12)
Check for solenoid valve kit failure. Removing a coil that is on will result in a clicking sound.
Also, removing a coil that is off will not produce such a sound.
(13)
Check whether too much refrigerant has been charged. Too much refrigerant has been charged if the
sub-cool temperature of the condenser is 15°C or more.
(14)
Check whether the wiring from the solenoid valve kit is actually connected to the different indoor unit.
(15)
Replace damaged components and correct the amount of charged refrigerant.
The system is that the multiple indoor units are connected at only one solenoid valve kit and also multiple
remote controllers are connected. Check whether "installation of the common use solenoid valve kit" from a
PC has been made. (Confirmation from the address setting software of a PC)
Connect a gauge to the high-pressure outlet and check for changes in the value displayed by the monitoring
software, and for large deviation of the gauge pressure.
Check whether the socket of the high-pressure switch is surely inserted into the Outdoor Unit Control PCB.
(14)
The wiring from the solenoid valve kit is actually connected to the different indoor unit.
(15)
The system is that the multiple indoor units are connected at only one solenoid valve kit and also multiple
remote controllers are connected. "Installation of the common use solenoid valve kit" from a PC has not
been made.
The operation of the electronic circuit in the high-pressure switch may short-circuit the terminal depending on the
pressure. A pressure of 3.8 MPa or above will short-circuit the terminal. Once the terminal is short-circuited, it will
remain in that state until the pressure goes below 3.15 MPa.
Alarm conditions
Probable cause
Check
Correction
P05, P15 Alarm
Alarm code P05, P15
Alarm meaning
Open phase, reversed-phase of the compressor wiring
Open phase any of the L1-L2-L3-N, reversed-phase of the compressor wiring
(1) Open phase any of the L1-L2-L3-N
(2) Reversed-phase of the compressor wiring
(3) Wiring failure
(1) Check the power supply and power wiring.
(2) Check the compressor wiring.
Check whether the wiring between the HIC PCB and compressor is reversed-phase (position of U, V, W is
properly placed), missing, connection failure.
(3) Check the wiring.
Check whether each wiring is missing or connector is damaged.
(1) Correct the power supply and power wiring.
(2) Correct the compressor wiring.
(3) Correct the wiring failure.
Miswiring occurred when replacing the compressor or HIC PCB.
Alarm conditions
Probable cause
Check
Correction
Example
—
Notes
SM830253-00_欧州2way7_SM-TRSM.indb 22 16/08/02 14:02:51
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