V6-i VRF 50/60Hz
111
P
art
6
- Di
agno
si
s and
Tr
ou
bles
ho
o
ting
2.17
P2, H5: Suction pipe low pressure protection
Digital display output
2.17.1
Description
2.17.2
Suction pipe low pressure protection. If the system has a 3-phase protector and the 3-phase protector is connected to
the low pressure switch, the system will display P2 protection when initially powered on, and P2 protection will
disappear once the system reaches a steady state.
All units stop running.
Error code is only displayed on the unit with the error.
Trigger / recover condition
2.17.3
Trigger condition:
For P2 protection: Suction pressure ≤ 0.05MPa.
For H5 protection: P2 protection appears three times in 60 minutes.
Recover condition: Suction pressure ≥ 0.15MPa.
Reset method:
For P2 protection: Resume automatically.
For H5 protection: Manually restart.
Possible causes
2.17.4
Outdoor unit stop valves are closed.
Insufficient refrigerant.
Low pressure side blockage.
Poor evaporator heat exchange.
Main PCB damaged.
