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2.19.5 Procedure
the outdoor ambient temperature is too
Low pressure sensor connection on main
Low pressure sensor has short-circuited or
Insufficient refrigerant caused by
refrigerant leakage
The low pressure side is blocked, caused by
crushed or bent pipe, blocked EXV, or dirty
The evaporator heat exchange is poor
Replace outdoor main PCB
Notes:
1.
Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor has
failed.
2.
An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal, discharge and suction pressures to be lower than normal
and compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. These issues disappear once sufficient refrigerant has
been charged into the system.
3.
A low pressure side blockage causes compressor discharge temperature to be higher than normal, suction pressure to be lower than normal and compressor
current to be lower than normal, and may cause frosting to occur on the suction pipe.
4.
In cooling mode check indoor heat exchangers, fans and air outlets for dirt/blockages. In heating mode check outdoor heat exchangers, fans and air outlets
for dirt/blockages.
P2
low
No
PCB is loose
No
1
failed
No
2
No
3
filter
No
4
No
Atom B Series VRF 50/60Hz
Yes
Stop the unit
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
Add refrigerant or inspect the system for
Yes
Inspect the system and fix the error. If the
Yes
filter is blocked by ice, the piping should be
Yes
Inspect the system and fix the error
leaks
cleaned
69
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