BASIC TROUBLESHOOTING
SYMPTOM POSSIBLE FAULT AND REMEDY
No LCD display If thermostat is battery powered only, remove battery compartment
and check to see that the positive (+) and negative (-) ends of each
battery are oriented properly. If thermostat is hardwired, remove the
thermostat from the subbase and check for 24 Volts across terminals
‘C’ and ‘R’. If no voltage, fault could be equipment or wiring related.
Thermostat can not be set In the Installer Options menu, set 4:FN = A for auto changeover.
for auto changeover 4:FN = - is for manual heat / cool
4:FN = C is for cooling only
4:FN = H is for heating only
Temperature display is 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 the thermostat.
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