1501
(U2)
Closed valve in cooling mode
Abnormal points and detection methods Causes and check points
Abnormal if stop valve is closed during cooling operation.
Abnormal when both of the following temperature conditions are satised
for 20 minutes or more during cooling operation.
1. TH22j − TH21j
]
-3.6°F [−2°C]
2. TH23j − TH21j
]
-3.6°F [−2°C]
Note:
For indoor unit, the abnormality is detected if an operating unit satises the
condition.
Outdoor liquid/gas valve is closed.
Mulfunction of outdoor LEV (LEV-A) (blockage)
TH21:
Indoor intake temperature thermistor (RT11 or TH1)
TH22:
Indoor liquid pipe temperature thermistor (RT13 or TH2)
TH23:
Branch box gas pipe temperature thermistor (TH-A to E
)
LEV: Electronic expansion valve
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Diagnosis Remedy
v
Is the
outdoor stop valve
(liquid/gas)
fully open?
Open the
outdoor stop valve
(liquid/gas) fully
.
No
Yes
Disconnect the outdoor LEV wiring to
check the resistance.
No
Yes
Replace the outdoor LEV.
Replace the outdoor controller board.
Is there a resistance detected?
69
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