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Mini VRF SYSTEM
Trouble Diagnosis
6
3. Mini VRF Alarm Codes
H03 Alarm
2WAY SYSTEM
Trouble Diagnosis
4. 2WAY Alarm Codes
H05 Alarm
Alarm code H05
Alarm meaning Compressor discharge temperature sensor disconnected
Alarm conditions This alarm occurs when the discharge sensor temperature detector is not inserted into the tube’s
sensor holder, or when the sensor itself has suffered some kind of malfunction other than a cut
wire.
When outdoor air temperature is -10°C or higher:
Alarm occurs if the temperature detected by the discharge sensor has changed by less than
2°C when the compressor has operated for 10 minutes immediately after start.
When outdoor air temperature is below -10°C:
Alarm occurs if the temperature detected by the discharge sensor has changed by less than
2°C when the compressor has operated for 30 minutes immediately after start.
•
•
•
Probable cause
(2) Discharge sensor itself has suffered some kind of malfunction other than a cut wire.
Check
(1) Discharge sensor temperature detector is not inserted into the tube’s sensor holder.
(1) Check that the discharge temperature sensor is inserted into the sensor holder.
(2) Check that sufficient heat-conducting putty is applied.
(3) Remove the discharge sensor from the sensor holder and expose the sensor to the outside
air for approximately 5 minutes. Check that the temperature detected by the sensor changes
to match the outside air temperature. (However the sensor cannot detect temperatures at or
below 0 °C.)
Correction (1) Install the sensor into the holder, and apply sufficient heat-conducting putty.
(2) If the sensor is malfunctioning, replace it.
Example
—
Alarm code H03
Alarm meaning Compressor current sensor is disconnected or shorted.
Alarm conditions
When the frequency of compressor (INV) is over 35Hz and the secondary current is over 9.8A,
the primary current detected lower than 0.7A.
When the frequency of compressor (INV) is limited by current protection (primary), the primary
current detected lower than 0.7A.
* No current is detected even though the compressors are operating.
Probable cause
(2) HIC PCB failure
(3) Power supply and voltage malfunction
Check
(1) CT failure
Check the power supply and 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 if the
compressor starts running.)
Correction (1) Correct the power supply voltage.
Replace the Outdoor Unit Control PCB or the HIC PCB.
Example —
Notes —
3WAY SYSTEM
Trouble Diagnosis
4. 3WAY Alarm Codes
H06 Alarm
Alarm code H06
Alarm meaning Abnormal decrease of low-pressure
Alarm conditions
Probable cause (1) Low-pressure sensor failure
(1) Low-pressure sensor failure
(1) Replacement of low-pressure sensor
(2) Correct malfunction of refrigerant cycle.
(2) Failure to open the service valve of the outdoor unit
(4) Insufficiency of refrigerant gas
(2) Failure to open the service valve of the outdoor unit
(3) Clogged refrigerant circuit
(4) Insufficiency of refrigerant gas amount
Check
•
Correction
When replacing a low-pressure sensor, carry out after refrigerant recovering of outdoor unit.
Example
Low-pressure sensor detects lower than 0.06MPa continuously for 2 minutes or lower than 0.02MPa
for just a moment.
•
The alarm had occurred because of refrigerant insufficiency due to gas leak.•
The alarm had occurred when the liquid, suction and discharge tubes were clogged together.•
Remove the socket of low-pressure sensor from the Outdoor Unit Control PCB and measure the
resistance of each wire (×3) and between the outdoor unit and earth.
If this resistance is more than 1MΩ, it indicates normal. If not, replace the sensor.
• Connect a gauge to the low-pressure outlet and check for changes in the value displayed by the
monitoring software, and for large deviation of the gauge pressure.
Check the open/closed status of the service valve.
(3) Check for clogging of the refrigerant circuit.
When clogging in the refrigerant circuit occurs, refrigerant does not return to the compressor.
As a result, low-pressure may occasionally decrease abnormally.
When insufficiency of refrigerant charge amount or of refrigerant amount in the system caused by
gas leakage occurs, low-pressure may occasionally decrease abnormally.
Solenoid valve, expansion valve, fleezing caused by contaminated water inside the circuit, etc.
Then check the following points:
Open valve of outdoor unit.
Correct clogging.
•
•
Dissolve insufficiency of refrigerant gas
(Correction of gas leakage area, additional refrigerant, etc.)
•
When charging additionally because of refrigerant insufficiency, add each 500g of refrigerant
little by little.
SM830228-00_3WAY ECO-i SYSTEM.in18 18 2013/03/16 18:25:21
H08 Alarm
Alarm code H08
Alarm meaning Compressor oil sensor (connection) trouble
Alarm conditions This alarm occurs when a connector connection (pins 1 and 3 for compressor) is open.
Probable cause Disconnected connector
Check Check that the connector is securely connected.
Correction (1) Connect the connector.
Example —
Notes
SM830289-00_Sec6.indd 13SM830289-00_Sec6.indd 13 2021/01/29 16:15:422021/01/29 16:15:42
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