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Table 7 — Troubleshooting
*If fuse blows or circuit breaker trips again after first start attempt, DO NOT attempt to start system again.
Contact your local dealer for assistance.
†When outdoor temperature is approximately 55 F or below, indoor coil frosting may occur when system is
operated in cooling or maximum dehumidification mode. Units are not intended to operate below 55 F
without appropriate accessories.
PROBLEM CAUSE TYPICAL SOLUTION
System Does Not Start. Blown fuse or circuit breaker tripped at building
power entry.
Replace fuse or reset circuit breaker.*
Indoor and/or outdoor unit disconnect switch is off. Turn on disconnect switch(es).
Thermostat is set to night mode. Cancel mode using Day/Night button on thermostat.
Power failure. Restore power.
Unit is in off mode. Press Mode button on thermostat until thermostat
displays the desired unit mode.
Three-minute time delay is running. Wait for 3 minutes.
Temperature is above or below the selected
temperature.
Select new temperature using the thermostat.
System Does Not Cool Properly. Air filter(s) in indoor unit is dirty or needs to be
replaced.
Clean or replace air filter(s).
Temperature is set too high or too low. Reset temperature to desired comfort setting using
the thermostat.
Outdoor unit outdoor coil restricted. Remove obstruction.
Fan speed is set too low. Adjust fan speed to high or auto. using the Fan
button on the thermostat.
System Does not Heat Properly. Air filter(s) in indoor unit is dirty or needs to be
replaced.
Clean or replace air filter(s).
Temperature is set too high or too low. Reset temperature to desired comfort setting using
the thermostat.
Outdoor unit outdoor coil restricted. Remove obstruction.
Fan speed is set too low. Adjust fan speed to high or auto. using the Fan
button on the thermostat.
Outdoor unit outdoor coil is frosted up. Check manual defrost timer setting and adjust as
necessary.
Ice or frost has Formed
on Indoor Coil.†
Low outdoor-air temperature. Run system in fan-only mode until frost is gone.
Air filter(s) in indoor unit is dirty or needs to be
replaced.
Clean or replace air filter(s).
Insufficient Airflow. Air filter(s) in indoor unit is dirty or needs to be
replaced.
Clean or replace air filter(s).
Fan coil unit coil is blocked. Clean air discharge louvers.