SM-16007
3-77
TROUBLESHOOTING
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Alarm
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Cause
Check Item
Action
(Turn OFF Main Switch)
Event
Faulty Low
Pressure Sensor
Check output voltage
is correct.
Replace pressure
sensor if faulty.
Failure
Indicated Value of
Pressure Value
is Excessively
High or Low
Check for clogging
of check joint.
Replace check joint.
Malfunction of Pressure
Sensor due to Faulty
Check Joint
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.
Faulty O.U. PCB
Is connection CN8
of O.U. PCB abnormal?
Is 5 VDC applied between
#1 and #3 of connector
CN8 of O.U. PCB?
Is voltage under 0.1 VDC
or over 4.9 VDC between
#2 and #3 of connector
CN8 of O.U. PCB?
Yes
Yes
Is access port clogged?
Failure of
Low Pressure Sensor
Connect it correctly.
Failure of O.U. PCB
Yes
No
Failure of O.U. PCB
No
No
No
Replace access port.
Yes
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Summary of Contents for YVAHP0721CW Series
Page 2: ......
Page 10: ...viii SM 16007 ...
Page 14: ......
Page 15: ...SM 16007 1 1 INSTALLATION 1 Installation ...
Page 163: ...SM 16007 2 1 OPERATION 2 Operation ...
Page 164: ...2 2 SM 16007 OPERATION Ɣ 5HIHU WR WKH 6HUYLFH 0DQXDO IRU QGRRU 8QLW RU RQWUROOHU ...
Page 165: ...SM 16007 3 1 TROUBLESHOOTING 3 Troubleshooting ...
Page 284: ......
Page 285: ...SM 16007 4 1 MAINTENANCE 4 Maintenance ...
Page 360: ......
Page 390: ......
Page 391: ...SM 16007 6 1 FIELD WORK INSTRUCTIONS 6 Field Work Instructions ...
Page 400: ...6 10 SM 16007 FIELD WORK INSTRUCTIONS 0ROOLHU KDUW IRU 5 ft 3 l b ...
Page 401: ...SERVICE PARTS LIST SM 16007 7 1 7 Service Parts List ...
Page 416: ... 2016 Johnson Controls Inc SM 16007 Code No LIT 12012400 Issued November 2016 ...