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Problem Possible Cause Action
Snowfl ake 5-minute lockout No action needed: should
icon blinking enabled to protect stop blinking after
compressor 5 minutes
No Heat, No Cool, Blown fuse / Replace fuse or reset
or No Fan tripped circuit breaker
breaker
Furnace power Turn switch to ON
switch to OFF
Furnace blower Replace door panel
compartment door in proper position to
or panel loose or engage safety interlock
not properly or door switch
installed
Loose connection Tighten connections
to thermostat
or system
Low Batteries Replace batteries
Thermostat & The thermometer can be
Indoor adjusted +/- 4 degrees.
Thermometer See Temperature Display
Setting Disagree Adjustment in the
Confi guration Menu section
Problem Possible Cause Action
No Display or Low Batteries Replace batteries
no backlight
Thermostat AM or PM set Check the current
doesn’t follow the incorrectly in the settings including AM and
scheduled program program PM designations for
each time period
AM or PM set
incorrectly on the
thermostat’s clock
Heating or Cooling Energy No action required
starts earlier than Management
programmed Recovery function
activated. See
Table 3.3, Step 4
for details
Remember to turn off your heating / cooling
system BEFORE resetting your thermostat. You will then have to
go through a full initial setup described in Part 3 and Part 4 of the
manual before you can turn your Heating & Cooling system back on.
Failure to follow this instruction may lead to your Heating & Cooling
system damage or malfunction.
Reset Operation
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation, you can reset the thermostat
by pressing all three buttons (TIME, and
both
buttons)
simultaneously. This reset will restore your thermostat’s initial
factory setting.
Part 5 Troubleshooting Guide
5 Troubleshooting Guide (continued)