136
Failure code
Outdoor
digital
display tube:
122-0, 1
Indoor wired
controller: 7A
Indoor unit LED status
LED5 Failure description:
Radiator temp. sensor of compressor mo-
dule is abnormal.
20 times
Outdoor unit LED status
LED1L ED2
Normal Normal
1. Model Failure diagnosis and troubleshooting
MRV 5-HR series
DiagnosisT roubleshooting
2. Abnormity detection method
◆
Check if the temperature
acquisition circuit of inverter
board is normal.
◆
Check if the resistance of
temperature sensor is normal.
◆
Check if they are connected
correctly
conditions
The temperature sensor is
disconnected or the resistance
is incorrect.
4. Possible causes
◆
The resistance of
temperature sensor is found
with drift.
◆
The inverter board acquires
inaccurate temperature.
Check if the sensor and
variable frequency board is
connected correctly.
Check if the sensor
resistance is normal.
Replace t he variabl e
frequency board.
Replace the sensor.
Adjust the connection
between temperature sensor
and variable frequency
board.
Y
Y
N
N
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