Hisense AVWT-192FFFH User Manual

151
Troubleshooting
Alarm
Code
21
Abnormality of High 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.
Is the connection CN7
of O.U. PCB abnormal?
Is 5 VDC applied across
#1 and #3 of the connector
CN7 of O.U. PCB?
Yes
Yes
Is voltage under 0.1 VDC
or over 4.9VDC across
#2 and #3 of the connector
CN7 of O.U. PCB?
Is the check joint
clogged?
Abnormality of
high pressure sensor
Connect it correctly.
Faulty O.U. PCB.
Yes
No
No
No
No
Faulty O.U. PCB.
Replace check joint.
Yes
Cause Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Faulty Top of
Compressor
Thermistor
Check resistance.
Replace thermistor
if faulty.
Fault
Indicated Value of
Pressure Value
is Excessively
High or Low
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
Check for clogging
of check joint.
O.U. PCB: Outdoor Unit PCB

Hisense AVWT-192FFFH Specifications

General

Brand	Hisense
Model	AVWT-192FFFH
Category	Air Conditioner
Language	English