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Service Manual
3-75
TROUBLESHOOTING
Alarm
Code
Abnormality of Thermistor for Outside Air Temperature
(for Econo Fresh)
O
7KH581LQGLFDWRUUHGÀDVKHV
O
The indoor unit number and the alarm code are displayed on the LCD. The alarm code is displayed on
the 7-segment display of the outdoor unit PCB.
+
7KLVDODUPFRGHLVGLVSOD\HGZKHQDVKRUWFLUFXLWNȍRUOHVVRUGLVFRQQHFWLRQNȍRUPRUHRI
the thermistor is detected during a heating or cooling operation.
Refer to "Alarm Code 11"
for thermistor resistance.
Failure of I.U. PCB
Yes
Failure of
Thermistor
No
Is resistance of THM4
(for Outside Air Temperature)
between 0.24k
Ω
and 840k
Ω
?
Cause
Check Item
Action
(Turn OFF Main Switch)
Event
Failure of
Outlet Air
Thermistor
Check resistance.
Replace thermistor
if faulty.
Failure
Check wiring to
I.U. PCB.
Correctly connect wires.
Incorrect Connection
Replace I.U. PCB
and check operation.
Replace I.U. PCB
if faulty.
Failure of I.U. PCB
Failure of
Thermistor for
Outside Air
Temperature
Summary of Contents for YVAHP072B31S
Page 2: ......
Page 10: ...viii Service Manual ...
Page 16: ......
Page 17: ...Service Manual 1 1 INSTALLATION 1 Installation ...
Page 577: ...Service Manual 1 561 INSTALLATION 9 Touch Back to return to the Service Menu screen 9 ...
Page 920: ......
Page 921: ...Service Manual 2 1 OPERATION 2 Operation ...
Page 1315: ...Service Manual 3 1 TROUBLESHOOTING 3 Troubleshooting ...
Page 1461: ...Service Manual 4 1 MAINTENANCE 4 Maintenance ...
Page 1728: ......
Page 1729: ...Service Manual 6 1 FIELD WORK INSTRUCTIONS 6 Field Work Instructions ...
Page 1738: ...6 10 Service Manual FIELD WORK INSTRUCTIONS 6 8 Mollier Chart for R410A ft 3 l b ...
Page 1739: ...SERVICE PARTS LIST Service Manual 7 1 7 Service Parts List ...
Page 1795: ......
Page 1796: ... 2015 Johnson Controls Inc SM 15001 ...