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16
49-5000400 Rev. 5
Troubleshooting Tips
Problem Solution
Display is blank Check for 12VDC; display is blank
when 12V is not present.
All thermostat buttons
are non-responsive
Verify that the 12VDC is present;
the unit will not operate when the
voltage is below 10.5V.
Fan and Compressor
will not turn ON
Verify that 115VAC is present.
Fan does not turn ON,
but the Compressor
does turn ON
WITH POWER REMOVED, verify
that nothing is obstructing the fan
blade, that it spins freely.
Check the 5 amp Fuse on the board
Fan runs continuously Check Fan Mode. If set to FAN ON,
the fan will run continuously.
Room Temperature does
not match Setpoint when
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Verify proper installation per
installation instructions (pg. 5 …
not on exterior wall or in direct
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a vent or duct…)
Compressor does not
turn ON immediately
when changing Modes
or Setpoint
This is normal, there is a 3
minute OFF timer preventing the
compressor from being turned OFF
and right back ON.
Fan does not turn ON
immediately when
changing Modes or
Setpoint
In Heat-Pump mode, if Auto Fan is
selected, the fan will not turn ON
until the compressor turns ON after
the 3 minute OFF timer.
F5 Flashes on the Wall
Thermostat
With a Cool Only model, check that
DIP Switch #1 on the back side of
the wall thermostat is turned OFF.
(see Wiring Diagram)
With a Heat-Pump model, check
to see if the outdoor temperature
sensor is unplugged or damaged.
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