Heat Pump, Split System, Single Service, 3 phase
Maintenance Document 1394-1 45
Clear 26: Low pressure abnormal
Hydraulic Unit LED:
Green 10 flashes / Red 5 flashes
Outdoor Unit LED: 20 flashes
Probable causes:
• Connector connection failure.
• Pressure Sensor failure.
• Main PCB failure.
• Gas leak, less.
Check:
2. Check output voltage of Main PCB :
Check voltage of Main PCB (Measure at Main PCB side connector)
1 pin(Red) - 3 pin(Black) DC5V +/- 5%
If the voltage is not correct, replace Main PCB.
OK
3. Check if gas leak or less gas
Measure Gas pressure, if there is a leak, correct it.
If recharging refrigerant, make sure to perform vacuuming and
recharge the specified amount.
OK
1. Check connection of the Pressure Sensor:
- Check if the terminal connection is loose.
- Check if connector is removed.
- Check if connector is erroneous connection.
- Check if cable is open.
Upon correcting the removed connector or mis-wiring, reset the power.
OK
4. Replace Pressure Sensor
If Check Point 1 ~ 3 do not improve the symptom, replace Pressure
Sensor.
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