4421 Tradition Trail ● Plano, Texas 75093 ● 972-964-2700 ● 800-836-7472
SP-ENG-211-000-17 Rev 1.3
19
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P a g e
*3
Note:
Refer to Electrical Schematics for further diagnostics.
Unit Not Cooling
Is Compressor
On?
YES
NO
Check
Setpoint. Is
Setpoint
below
ambient?
YES
NO
Is snowflake
LED lit on
controller?
Set Setpoint between
70 to 95 deg F
YES
NO
Is evaporator
Fan on?
YES
NO
Is there voltage to
compressor? Use
meter
3
Check for faulty
evaporator fan
3
Measure Temperature at Evaporator
& Verify Heat Load Requirements. Is
unit capacity adequate for internal
head load? Possible low refrigerant.
Is compressor
thermal overload
open? Use ohm
meter.
3
Check for error code
CA,LA,HA,LA2,HA2,
P1, or P2
YES
NO
Check contactor
circuit. Does it have
power?
3
NO
YES
Refer to Alarm Signals
in Digital Temperature
Controller
Programming Section
Contact Customer
Support
NO
YES
Verify contact coil is
being activated. Check
connectivity
3
, if issue
persists component
replacement may be
needed.
Contact
Customer
Support
YES
NO
YES
Contact Customer
Support
Replace Thermal
Overload.
