3-86
Service Manual
TROUBLESHOOTING
Alarm
&RGH
$EQRUPDOLW\RI7KHUPLVWRUIRU2XWGRRU$LU7HPSHUDWXUH
2XWGRRU8QLW$PELHQW7KHUPLVWRU
Outdoor Unit
Ambient Air Thermistor
(THM7)
O
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O
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1)
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1)
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+
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Yes
Yes
Connect them.
No
No
Is thermistor THM7
connected to THM7
(Ta, color: red) of
O.U. PCB?
Is resistance of THM7
between 0.2k
Ω
and
840k
Ω
?
Failure of
Thermistor
Failure of O.U. PCB
Cause
Check Item
Action
(Turn OFF Main Switch)
Event
Failure of
Thermistor for
Outdoor Air Temp.
Check resistance.
Replace thermistor
if faulty.
Failure
Check wiring to
O.U. PCB.
Repair wiring and
connection.
Incorrect Connection
Replace O.U. PCB
and check operation.
Replace O.U. PCB
if faulty.
Failure of O.U. PCB
283&% 2XWGRRU8QLW3&%
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 ...