Carrier 50YDV Installation, Operation And Maintenance Instructions page 44

R e s i d e n t i a l P a c k a g e d U n i t s - 6 0 H z P u r o n
R e v. : 4 J a n . , 2 0 1 2
CXM Process Flow Chart
WARNING! HAZARDOUS VOLTAGE! DISCONNECT
ALL ELECTRIC POWER INCLUDING REMOTE
DISCONNECTS BEFORE SERVICING.
Failure to disconnect power before servicing can cause
severe personal injury or death.
See " Unit
Yes
short
cycles"
Yes
See " Only
Fan Runs"
See " Only
Yes
Comp
Runs"
See " Does
No
not Operate
in Clg"
44
WARNING!
CXM Functional
Start
Troubleshooting Flow Chart
Did Unit
No
Attempt to
Start?
Yes
Did Unit
Yes
Lockout at
Start-up?
No
Unit Short
Cycles?
No
Only Fan
Runs?
No
Only
Compressor
Runs?
No
Did unit lockout
Yes
after a period of
operation?
No
Does unit
operate in
cooling?
Yes
Unit is OK!
'See Performance
Troubleshooting' for
further help
®
Check Main
power (see power
problems)
Check fault LED code
on control board
See
See HP
LP/LOC
Fault
Fault
See FP2 See
Fault Condensate
Fault
No fault
See FP1
Replace
Fault
See Over/
Under
Voltage
shown
CXM