3-2
Service Manual
TROUBLESHOOTING
Check the following items if there is any abnormality in the activation of the system.
No.
Check Situation
Check Method
1
Is any power source breaker or
fuse blown out?
Check the voltage (secondary side) of the breaker and also
check the continuity of the fuse with a tester.
2
Is voltage at the secondary side
of the transformer correct?
Disconnect at the secondary side of the transformer and measure
voltage with a tester.
3
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correctly connected?
Check that the following wiring connection on O.U./I.U. printed circuit
boards (PCBs) is not loose.
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Check that the wiring connection on O.U./I.U. PCBs is not loose or
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If the fuse(s) on an I.U. PCB blow out, diagnose the cause of overcurrent and recover the fuse(s).
In addition, check the power source of optional parts because the fuse may blow out by the power source
failure.
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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 ...
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Page 1796: ... 2015 Johnson Controls Inc SM 15001 ...