OUT-86
DUAL, TRIPLE, POKER DC Inverter : 3. Outdoor Unitis & Troubleshooting
Multi Liberty
DC Inverter
The display shows “P1”.
Intervention of High Pressure protection.
Hypothesis 2:
Malfunction of High Pressure Sensor.
Measure high pressure value on circuit: is it OK?
Hypothesis 3:
Outdoor temperature is too high?
Hypothesis 4:
Check if Outdoor Unit is well ventilated.
Replace Outdoor Unit’s main PCB.
Hypothesis 5:
Outdoopr heat exchanger is dirty.
Restore.
Eliminate eventual obstacles.
Clean heat exchanger.
Replace H_PRO Sensor.
Hypothesis 1:
Check wirings and connection of High Pressure
Sensor (H_PRO) to Control PCB. Are they OK?
Disconnect connector from the Sensor, then check if normal
operation of system is restored.
YES
YES
YES
NO
YES
YES
NO
NO
NO
NO
NO
NO
• Check if refrigerant circuit is obstructed.
• Does 4-way valve operate properly?
• Do expansion valves (EXV) operate properly?
• Empty refrigerant (by recovering it).
Eliminate obstruction along the circuit, carry
out the vacuum procedure and weighed out
recharge of R410A.
• Replace 4-way valve or EXV valve which
present eventual operation anomalies.
Intervention of high pressure protection
(*)
[Models HCKU 816 X4, HCKU 1066 X4 only]
P 1
System stop.
Outline of protectio function
• Troubleshooting flowcharts, referred to Protection Codes displayed on Outdoor Unit:
Protection Code on Outdoor Unit
(*)
Invervention value of H_PRO: 3.3Mpa
Reactivation value of H_PRO: 2.4MPa.