BASIC TROUBLESHOOTING
48
SYMPTOM
POSSIBLE FAULT AND REMEDY
No LCD display
If the thermostat is battery powered only, remove the battery
compartment and check to see that the positive (+) and negative (-)
ends of each battery are oriented properly. Also make sure that the
thermostat is securely attached to the subbase with no exposed
gaps.
Thermostat can not
Installer Option 03 needs to be set to 0 to provide Heat/Auto/Cool/Off
be set for auto changeover
operation or Heat/Auto/Cool/Emergency Heat/Off for heat pumps.
03 = 1 Manual Changeover (Heat/Cool/Off)
03 = 2 Heat Only (Heat/Off)
03 = 3 Cool Only (Cool/Off)
Temperature display
Air from wall cavity may be leaking into the rear of the thermostat.
inaccurate
Seal hole where wiring enters subbase to prevent air infiltration.
External influence from appliances, lighting or drafts may be affecting
temperature accuracy. Move lamps or other sources of heat away
from thermostat.
Thermostat not displaying
Check wiring at outdoor sensor and sensor terminals on subbase.
outdoor temperature
Outdoor sensor wires to terminals S2 and SC.