156
Troubleshooting
Alarm
Code
2Q
Abnormality of Low Pressure Sensor for Outdoor Unit
● The RUN indicator (Red) is ashing
● The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on
LCD. Meanwhile, the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB.
★
This alarm code is indicated when the pressure sensor voltage decreases to 0.1V or less or increases to 4.9V or more
during running.
Cause Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Faulty Low
Pressure Sensor
Check output voltage
is correct.
Replace pressure
sensor if faulty.
Fault
Indicated Value of
Pressure Value
is Excessively
High or Low
Check for clogging
of check joint.
Replace check joint.
Malfunction of Pressure
Sensor due to Faulty
Check Joint
Check wiring to
O.U. PCB.
Repair wiring and
connections.
Incorrect Connection
Replace O.U. PCB
and check operation.
Replace O.U. PCB
if faulty.
Faulty O.U. PCB
Is the connection CN8
of O.U. PCB abnormal?
Is 5 VDC applied across
#1 and #3 of the connector
CN8 of O.U. PCB?
Is voltage under 0.1 VDC
or over 4.9 VDC across
#2 and #3 of the connector
CN8 of O.U. PCB?
Yes
Yes
Is the check joint
clogged?
Abnormality of
low pressure sensor
Connect it correctly.
Faulty O.U. PCB
Yes
No
Faulty O.U. PCB
No
No
No
Replace check joint.
Yes
O.U. PCB: Outdoor Unit PCB
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