Table 7 — Troubleshooting
PROBLEM | CAUSE | TYPICAL SOLUTION |
System Does Not Start. | Blown fuse or circuit breaker tripped at building power | Replace fuse or reset circuit breaker.* |
| entry. |
|
| 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 dis- |
|
| plays the desired unit mode. |
| Wait for 3 minutes. | |
| Temperature is above or below the selected | Select new temperature using the thermostat. |
| temperature. |
|
System Does Not Cool Properly. | Air filter(s) in indoor unit is dirty or needs to be | Clean or replace air filter(s). |
| replaced. |
|
| 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 | Clean or replace air filter(s). |
| replaced. |
|
| 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 nec- |
|
| essary. |
Ice or frost has Formed | Low | Run system in |
on Indoor Coil.† | Air filter(s) in indoor unit is dirty or needs to be | Clean or replace air filter(s). |
| ||
| replaced. |
|
Insufficient Airflow. | Air filter(s) in indoor unit is dirty or needs to be | Clean or replace air filter(s). |
| replaced. |
|
| Fan coil unit coil is blocked. | Clean air discharge louvers. |
*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 with- out appropriate accessories.
