Troubleshooting tips.
Problem | Solution |
No display | Check for 24 VAC at thermostat; display |
| is blank when 24 VAC is not present. |
|
|
System fan does not | Verify that wiring is correct. |
come on properly |
|
|
|
All thermostat buttons | Verify that 24 VAC is present; unit |
are inoperative | locks out when 24 VAC is not present. |
|
|
Thermostat turns on and | Adjust temperature differential (see |
off too frequently | Setting a New Temperature Differential). |
|
|
Program schedule activates | Check time (AM/PM) set on |
at the wrong time | thermostat (see Programming). |
|
|
Thermostat does not | Verify that it is in Program mode; PROG |
follow program | displays solid; check time (AM/PM); |
| check if in Hold mode (PROG flashing). |
|
|
“PROG” flashes | Press Hold button to remove from |
(in Hold mode) | Hold mode. |
|
|
Fan runs continuously | Check Fan Auto/On switch. If set to |
| ON position, fan will run continuously. |
|
|
Room temperature is | Verify that wall hole is plugged |
not correct | with putty or insulation. |
Compressor doesn’t run or turn off immediately when changing function or setting
There is a 3 minute time delay and a 3 minute minimum run time for the compressor when it turns on/off.
Fan doesn’t run or turn off | This is normal. On some models, the |
immediately when changing | fan may have a 3 minute minimum |
function or setting | run time/off time delay. |
|
|
“LO bat” displays on screen | Replace batteries with 2 fresh “AA” |
| alkaline batteries. |
|
|
Display reads “12:00 PM” | Set clock/time. |
|
|
Problem not listed above | Press the Reset button once. Reset |
| button function: time, day and mode |
| changed to last saved settings (saved |
| after power loss or when exiting |
20 | program setup; configuration and |
program settings are unchanged). |
