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Troubleshooting tips.
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) Holdmode.
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 There is a 3 minute time delay and a
or turn off immediately 3 minute minimum run time for the
when changing function compressor when it turns on/off.
or setting
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
program setup; configuration and
program settings are unchanged).
Problem Solution
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