Specifications

9
4. Run the system through all modes of operation in the
thermostat instructions to ensure correct operation.
If you have additional questions, please refer to the
installation manual that was sent with the thermostat.
XI. TROUBLESHOOTING GUIDE FOR UNIT OPERATION
PROBLEM
POSSIBLE CAUSE
CHECKS AND CORRECTIONS
Blown Fuse or Tripped
Replace fuse or reset circuit breaker. (Check for correct size fuse and
circuit breaker.)
Circuit Breaker
Broken or Loose Wires
Replace or tighten the wires
Voltage Supply Low
If voltage is below minimum voltage on data plate, contact local power
company.
Entire unit does
Low Voltage Circuit
Check 24 volt transformer for burnout or voltage less than 18 volts.
not run
Thermostat
Set thermostat on "Cool" and lowest temperature setting, unit should run.
Set thermostat on "Heat" and highest temperature setting, unit should run.
If unit does not run in both cases, the thermostat could be wired incorrectly or be
faulty. To prove faulty or miswired thermostat, disconnect thermostat wires at the
unit and jumper between “R” and “G” terminals, and the blower should run.
Replace a defective thermostat with correct thermostat only.
Interrupted Power
Check incoming supply voltage.
Thermostat
The differential is set too close at the thermostat. Readjust heat anticipator to 1.0 or
1.2.
Cycles
Thermostat
Improperly located thermostat (e.g. near kitchen), inaccurately sensing the comfort
level in the living area.
Wiring and Controls
Loose wiring connections, or control contactor defective.
Unit Undersized
Recalculate heat gains or losses for space to be conditioned. If excessive,
rectify by adding insulation, shading, etc.
Insufficient cooling
or heating.
Loss of Conditioned Air by
Leaks
Check for leaks in ductwork or introduction of ambient air through doors and
windows.
Thermostat
Improperly located thermostat (e.g. near kitchen), inaccurately sensing the comfort
level in the living area. Check anticipator setting.
Airflow
Lack of adequate airflow or improper distribution of air. Check the motor speed or
duct sizing. Check the filter, it should be inspected every month and changed if dirty.
Remove or add resistance accordingly.
Thermostat Improperly Set
Check if thermostat is set at correct temperature.
Unit will not
Defective Thermostat
Check thermostat operation. Replace if found defective.
operate on
Incorrect Wiring
Check for broken, loose, or incorrect wires.
"heating"
Blower Motor Defective
Check blower motor in one of the other switch positions. If it does not operate, check
for open overload. If overload is open and motor is not overheated, replace it.
Noisy
Operation
Blower and Blower Motor
Blower wheel hitting the casing. Adjust for clearance and alignment. Bent blower,
check and replace if damaged. Loose blower wheel on shaft, check and tighten.
Defective bearings, check and replace.
Rattles and Vibrations
Check for loose screws, panels, or internal components. Tighten and
secure. Copper piping could be hitting the metal surfaces. Carefully
readjust by bending slightly. Ensure refrigerant line set between the Air Handler Unit
and the Compressor Unit is isolated from ductwork and building structures.
Airborne Noises
Undersized ductwork will cause high airflow velocities and noisy operation.
Water drips from
unit
Unit Not Level
Level unit.
Condensate Drain Line
Kinked or Plugged
Clean condensate drain. Make sure external condensate drain is installed with
adequate vent, drop, and pitch