Johnson Controls YICM008B21S - Page 41

SM-18003
3-19
TROUBLESHOOTING
1: Refer to Section 3.1.4 (3) above for details.
Cause Check Item
Action
(Turn OFF Main Switch)
Event
Activation of
Float Switch
Failure of
Float Switch
Failure of
Drain Pump
Contact Failure
Incorrect Connection
Failure
Contact Failure
Incorrect Connection
Failure
Check drain pan.
Check drainage by
pouring water.
Check continuity
when drain level is low.
Measure resistance
with a tester.
Measure resistance
with a tester.
Measure voltage
between CN36 terminals
with a tester.
Check connection.
Check connection.
High Drain
Level
Clogging of
Drainage
Up-Slope
Drain Piping
Remove foreign particles
clogging drain pipe.
Replace float switch
if faulty.
Replace drain pump
if faulty.
Replace and tighten
connector.
Replace and tighten
connector.
Repair connection.
Repair connection.
Check PCB in
Self-Checking Mode.
1
Replace it if faulty. Failure of Indoor Unit PCB