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6
TROUBLESHOOTING
SYMPTOM
POTENTIAL SOLUTION
Thermostat turns on
Increase or decrease second (auxiliary) stage temperature
differential setting as appropriate to provide the desired
second (auxiliary)
performance level. See Setting Temperature Differential and
stage of heating or
Residual Cooling Fan Feature section of this manual.
cooling too quickly or
not quickly enough.
OFF is shown in
This indicates that the system is turned off at the thermostat.
Move the system selector switch to the HEAT or COOL position.
thermostat display
After the compressor short cycle protection 5-minute period
and heating or
expires the system should start within several seconds.
cooling system will
not start.
Thermostat display
It is possible that AC power is not present at the thermostat.
Check fuse, circuit breaker and thermostat wiring as appropriate
is blank.
to verify AC power is available.
If AC Power is present, call a professional service technician
immediately to verify thermostat and system performance.
HI is shown in the
The temperature sensed by the thermostat is higher than the
90˚ F (32˚ C) upper limit of the thermostats display range.
thermostat display
The display will return to normal after the sensed temperature
where the room
lowers within the 45˚ to 90˚ F (7˚ to 32˚ C) display range. Turn
temperature is
on the cooling system or use other methods to lower the
normally displayed.
temperature accordingly.
This condition could occur from the system being turned off
during an exceptionally warm period or upon installation when
the thermostat has been stored for a long period of time in a
warm vehicle or location prior to being installed. The thermostat
is equipped with a mechanical high temperature safety switch
that will turn off the thermostat should the temperature exceed
99˚ F (37˚ C).
LO is shown in the
The temperature sensed by the thermostat is lower than the
45˚ F (7˚ C) lower limit of the thermostats display range. The
thermostat display
display will return to normal after the sensed temperature rises
where the room
within the 45˚ to 90˚ F (7˚ to 32˚ C) display range. If the
temperature is
temperature in the controlled space seems to be normal, wait
normally displayed.
for the thermostat to acclimate to the correct room temperature.
If the room seems to be colder than usual, turn on the heating
system to raise the temperature as needed for comfort within
the room.
This condition could occur from the system being turned off
during a cold weather period or upon installation when the
thermostat has been stored for a long period of time in a cold
vehicle or location prior to being installed. The thermostat should
be allowed to warm up prior to installation to allow proper
heating control once installed.
cont.
8
6
TROUBLESHOOTING
SYMPTOM
POTENTIAL SOLUTION
Thermostat will not
This is above the normal thermostat temperature setting range
of 45˚ to 90˚ F (7˚ to 32˚ C).
allow me to program
a set point
temperature higher
than 90˚ F (32˚ C).
Thermostat will not
This is below the normal thermostat temperature setting range
of 45˚ to 90˚ F (7˚ to 32˚ C).
allow me to program
a set point
temperature lower
than 45˚ F (7˚ C).
Fan continues to run
Check that the fan control switch is in the AUTO position. This
will allow the fan to run only when the heating or cooling system
all the time whether
is turned on and running.
the system is on
Check thermostat wiring to make sure that the fan control
or off.
wiring is connected to the correct terminals on the wiring
terminal block. See Installation and Wiring Diagram sections of
this manual.
Fan continues to run
The Residual Cooling Fan Control Feature can allow up to a 90
second fan delay after cooling system shutdown for energy
in cooling mode when
efficiency gains. The default setting is 60 seconds. This can be
the system has
changed to disable this feature or shorten the time period if
turned off.
desired. See Setting Residual Cooling Fan Feature section of
this manual.
The room is too
See Review Set Temperature section of this manual to verify the
current set point and make any modifications that are necessary.
warm or too cold.
Thermostat will not
Keypad is locked. press either the
backlight key to unlock.
allow me to change
the set point.
Fan runs
Fan switch is in the Recirculate Mode
intermittently or
when system is off.
cont.
or
key along with the
.
®
9
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