Heat Pump, Split System, Single Service, 3 phase
28 Maintenance Document 1394-1
Clear 4: Heat pump capacity signal error
Hydraulic Unit LED:
Green 4 flashes / Red 1 flash
Outdoor Unit LED: 22 flashes
Probable causes:
• Misconnection.
• Sensor failure.
• Interface PCB failure.
Check:
1. Check connection interface PCB and Heat pump regulator PCB:
- See if the connector has been disconnected.
- See if the connection is correct.
- Check for any damage on the sensor cable.
After solving the misconnection problem, switch the heat pump back on.
2. Check resistance value:
3 pin of CN22 – M < 10Ω
OK
3. Replace interface PCB:
If check point 1 and 2 do not improve the symptom, replace Interface PCB.
OK
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