Failure Symptoms Guide - Eubank EAA1020A Installation & Operation Manual

5.2

Failure Symptoms Guide

PROBLEM/SYMPTOM
A. Unit does not run.
NOTE: An internal anti-short-cycle
timer will prevent the unit
from starting for .2 to 8
minutes following start-up.
B. Unit runs for long periods or continu-
ously; cooling is insufficient.
C. Unit cycles on high/low pressure
limit.
D. Unit blows fuses or trips circuit
breaker.
E. Water on floor near unit.
F. No space heating or reduced heating
(units equipped with resistance ele-
ments)
Eubank EAA/EGA Wall Mount AC Installation & Operation Manual
03/2021 Rev.5
LIKELY CAUSE(S)
1. Power supply problem.
2. Tripped internal disconnect.
3. Shut off by external thermostat or
thermostat is defective.
4. Unit off on high or low pressure limit. 4. Reset pressure switch.
5. Internal component or connection
failure.
1. Dirty filter or reduced airflow
2. Low refrigerant.
3. Component failure.
4. Unit undersized for job.
1. Loss or restriction of airflow.
2. Restriction in refrigerant circuit.
3. Refrigerant overcharge (following
field service)
4. Defective pressure control.
1. Inadequate circuit ampacity.
2. Short, loose, or improper connection
in field wiring.
3. Internal short circuit. Loose or
improper connection(s) in unit.
4. Excessively high or low supply volt-
age or phase loss (3ø only)
1. Obstruction in condensate line.
2. Obstruction or leak in condensate
pan.
3. Unit is not level.
1. Defective heating element(s).
2. Thermal limit open.
3. Defective heater contactor.
44
CORRECTION
1. Check power supply for adequate phase and voltage.
Check wiring to unit and external breakers or fuses.
2. Check internal circuit protection devices for continuity.
3. Check operation of wall-mounted thermostat.
5. Check for loose wiring. Check components for failure.
1. Check air filter(s). Check blower operation. Remove
airflow restriction.
2. Check for proper charge and possible refrigerant leak.
3. Check internal components, especially compressor for
proper operation.
4. Add additional units for greater capacity.
1. Check blower assembly for proper operation. Look
for airflow restrictions, e.g.. the air filter. Check blower
motor and condenser fan.
2. Check for blockage or restriction, especially filter drier
and capillary tube assembly.
3. Evacuate and recharge to factory specifications.
4. Check limit cutout pressures. Control is set to actuate at
approximately 60 PSIG (low pressure) and 650 PSIG (high
pressure)
1. Note electrical requirements in Chapter 2 and correct
as necessary.
2. Check field wiring for errors.
3. Check wiring in unit. See wiring and schematic dia-
grams. Test components (especially the compressor)
for shorts.
4. Note voltage range limitations specific to the compres-
sor troubleshooting section.
1. Check for clog or restriction.
2. Check pan for leak or blockage.
3. Level unit.
1. Check resistance element(s) for continuity.
2. Check continuity across thermal limit switch.
3. Check relay for proper operation. Replace if defective.