Johnson Controls YVAHP072B31S, Service Manual

Page: 1398 / 1796

3-84
Service Manual
TROUBLESHOOTING
Alarm
Code
Activation of Protection Device for Indoor Fan Motor
( Indoor Unit with AC Motor )
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Activation
of Internal
Thermostat for
Indoor Unit
Fan Motor
Measure resistance
with a tester.
Check continuity after
fan motor temperature
decreases to room temp.
Faulty
Internal
Thermostat
Failure
Replace fan motor if
no continuity.
Correct by tightening.
Replace connectors.
Contact
Failure
Check connection. Repair connection.
Incorrect
Connection
Measure coil
resistance and
insulation resistance.
Replace motor if faulty.
Faulty Indoor Unit
Fan Motor
Yes
Yes
Yes
Yes
Replace motor.
No No No
Repair wiring and
connection.
No
Replace motor.
No
Yes
Does indoor fan
run?
Is fan motor hot?
Is there continuity
at the internal thermostat
of indoor fan motor?
Is connection bad
at connector?
Is coil resistance
of fan motor normal?
Check indoor temperature.
If it is unusual, take suitable
action to reduce it.
O
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The indoor unit number (refrigerant cycle number - address number ), the alarm code, the model
code*
1)
, the model name*
1)
and the number of connected indoor units are displayed on the LCD. The
indoor unit number and the alarm code are displayed on the 7-segment display of the outdoor unit PCB.
*1) Except for some models.
+
This alarm code is displayed when over approximately 1A is applied to the indoor unit fan motor.