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TROUBLESHOOTING CHART
NOTE: SPECIFICATIONS AND PERFORMANCE DATA LISTED HEREIN ARE SUBJECT TO CHANGE WITHOUT NOTICE
Quality Makes the Difference!
All of our systems are designed and manufactured with the same high quality standards regardless of size or efficiency.
We have designed these units to significantly reduce the most frequent causes of product failure. They are simple to
service and forgiving to operate. We use quality materials and components. Finally, every unit is run tested before it
leaves the factory. That’s why we know. . .
There’s No Better Quality.
SYMPTOM
High head - low suction
a. Restriction in liquid line or flowrator
a. Remove or replace with proper size flowrator.
High head - high or normal suction
a. Dirty condenser coil
a. Clean coil
b. Overcharged
b. Correct System charge
c. Condenser fan not running
c. Repair or Replace
a. Incorrect flowrator
a. Replace with correct flowrator
b. Defective compressor valves
b. Replace compressor
c. Flowrator not seating properly
c. Check for debris under flowrator or deformed
flowrator. Remove debris or replace flowrator.
a. Power off or loose electrical connection
a. Check for unit voltage at contactor in unit
b. Thermostat out of calibration set too high b. Reset
c. Defective contactor
c. Check for 24 volts at contactor coil replace if
contacts are open
d. Blown fuses or tripped breaker
d. Replace fuse or reset breaker Check wiring -
replace transformer
e. Transformer defective
f. High or low pressure control open
(Optional)
f. Reset high pressure control or check unit charge
High pressure control opens at 425 psig
Low pressure control opens at 25 psig
g. Compressor overload contacts open
g. Replace compressor
NOTE: Wait at least 2 hours for overload to reset
Condenser fan runs,
compressor doesn't
a. Loose connection
a. Check for unit voltage at compressor check &
tighten all connections
b. Compressor stuck, grounded or open
winding
open internal overload
b. Wait at least 2 hours for overload to reset If still
open, replace the compressor.
c. Low voltage connection
c. At compressor terminals, voltage must be within
10 % of nameplate volts when unit is operating
d. Capacitor weak, open, or shorted
d. Check capacitor. If defective, replace.
Low suction - cool compressor
a.
a.
Iced evaporator coil
a. Defective overload protector
a. Replace - check for correct voltage
b. Unit cycling on low pressure control
b. Check refrigerant charge and / or airflow
a.
a. Increase speed of blower or reduce restriction
replace air filters
a. Excessive load
a. Recheck load calculation
b. Defective compressor
b. Replace
c. Reversing valve not seating properly.
c. Replace
a. Improperly sized unit
a. Recalculate load
b. Improper airflow
b. Check - should be approximately 400 CFM per
ton
c. Incorrect refrigerant charge.
c. Charge per procedure attached to unit service
panel
d. Incorrect voltage
d. At compressor terminals, voltage must be within
10% of nameplate volts when unit is operating
Evaporator coil freezing or frosting
a. Low airflow
a. Check - should be approximately 400 CFM per
ton, dirty air filters, all duct outlets open
b. Low refrigerant charge
b. Properly charge unit
c. Operating unit in cooling mode below
65°F outdoor temperature
c. Install or check low ambient control, should be
open below 65°F outdoor temperature
Low indoor airflow
Increase speed of blower or reduce restriction -
replace air filters
Insufficient cooling
High suction pressure
REMEDY
POSSIBLE CAUSE
Compressor short cycles
Registers sweat
Low airflow
Low head - high suction
Unit will not run
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DISCONNECT ALL POWER TO UNIT BEFORE SERVICING. FAILURE TO FOLLOW THIS WARNING
MAY RESULT IN PERSONAL INJURY OR DEATH DUE TO ELECTRICAL SHOCK.
WARNING
