8
Troubleshooting
SYMPTOM
CORRECTIVE ACTION
Display is blank
Install 2 fresh AA Alkaline batteries
No heat
Set system switch to
HEAT
and raise set point above room temperature.
Check thermostat wiring and connections.
Check pilot light or HSI system on furnace.
No cool
Set SYSTEM switch to
COOL
and lower set point below room temperature.
If snowflake is blinking, allow the 5 minute compressor lock-out to expire.
Check thermostat wiring & connections.
Blinking snowflake/flame
Allow the 5 minute compressor lock-out to expire.
System turns on/off
Adjust the differential setting on the thermostat.
too frequently or
A high differential decreases cycle rate and a low differential increases cycle
not enough
rate.
Display is not illuminated
Touch the up or down arrow key. Display will illuminate for 10 seconds.
Change the batteries (display will not illuminate when batteries are low)
Room temperature and
Normal (depending on differential setting).
set point disagree
Check for drafts that could quickly change the room temperature before the
system is able to correct it.
70803-IM 12/18/06 2:10 PM Page 8
