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TROUBLESHOOTING
Symptom Possible Cause Correction Action
No Heat/No Cool/
No Fan
(common
problems)
1. Blown fuse or tripped
circuit breaker.
2. Power switch to OFF.
3. Furnace blower
compartment door
or panel loose or not
properly installed.
4. Loose connection to
system.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper
position to engage safety
interlock or door switch.
Check connections at the
thermostat and equipment
control. Thermostat base
should be installed on a
at surface to ensure a
good connection with the
thermostat.
No Heat
1. Pilot light not lit.
2. Furnace Lock-Out
Condition. Heat may
also be intermittent.
3. Heat pump system
requires service.
Re-light pilot.
Many furnaces have safety
devices that shut down when
a lock-out condition occurs. If
the heat works intermittently
contact the furnace
manufacturer.
Reset Operation
If a voltage spike or static discharge blanks out the display or causes erratic thermostat
operation, you can reset the system by performing a power reset.
Note: Be sure to record the user’s Main Menu settings.
When thermostat is reset, Main Menu and Programming will reset to factory settings.
(Installer’s equipment setup options will NOT be aected by the reset.)
To reset the programming, clock and conguration settings, press and and
the SYSTEM touch keys simultaneously and hold until the screen resets.
Troubleshooting