York CIDH018B21S, Service Manual

Page: 42 / 186

3-20
SM-18001-rev.1
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
Condensate
Pump
Contact Failure
Incorrect Connection
Failure
Contact Failure
Incorrect Connection
Failure
Check condensate pan.
Check drainage by
pouring water.
Check continuity
when condensate
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
Condensate
Level
Clogging of
Drainage
Up-Slope
Condensate
Piping
Remove foreign
particles clogging
condensate pipe.
Replace float switch
if faulty.
Replace condensate
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