TROUBLESHOOTING GUIDE
Symptom
Action
Display will not come on.
•
•
•
Check if the circuit breaker is tripped—reset the circuit breaker.
Check if the fuse is blown—replace the fuse.
Check if the system switch at the equipment is in the Off position—
set to the On position.
•
Check wiring between thermostat and HVAC equipment—replace
any broken wires.
•
•
If 24 Vac is present, proceed with troubleshooting.
Temperature settings will not
change (Example: cannot set
the heating higher or the
cooling lower).
Check that the temperature setpoints are:
-
-
heating: 40 to 90°F (7 to 31°C)
cooling: 45 to 99°F (9 to 37°C).
•
Keyboard is locked. Contact the installer.
Heating will not come on.
•
•
•
Check if the circuit breaker is tripped—reset the circuit breaker.
Check if the fuse is blown—replace the fuse.
Check if the system switch at the equipment is in the Off position—
set to On position.
•
•
•
If 24 Vac is present, proceed with troubleshooting.
Wait five minutes for the system to respond.
Set system selection to Heat.
(Continued)
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