6
7
Resetting Thermostat
Non-Volatile Memory
The Reset feature allows the user to completely reset the thermostat and to register new
manual
˚F / ˚C
temperature scale switch settings.
1.
To erase all entered program settings, gently press
RESET
button using a paper clip or a
small pencil tip.
2.
This will return all thermostat settings to their default values and register all new manual
˚F / ˚C
temperature scale switch settings.
In the event of a power failure, the Non-Volatile Memory feature of this unit allows all settings to
be recovered, eliminating the need to reset temperature and differential settings. When AC
power is restored after an outage, all settings are retrieved from memory and reinstated.
Thermostat does not
turn on heating or
cooling system.
Check to see if
OFF
is shown in display. This indicates that the
system is turned off at the thermostat. Move the system selector
switch to the
HEAT
or
COOL
position. After the compressor short
cycle protection 5-minute period expires the system should start
within a minutes time.
Compressor protection features may be in effect due to
compressor short cycle conditions. See
Compressor Protection
section for full explanation of this feature.
Check thermostat wiring to make sure that the heating and
cooling stages are connected to the correct terminals on the
wiring terminal block. See
Installation
and
Wiring Diagram
sections of this manual.
Thermostat display
is blank.
It is possible that AC power is not present at the thermostat.
Check fuse, circuit breaker and thermostat wiring as appropriate
to verify AC power is available.
If AC Power is present, call a professional service technician
immediately to verify thermostat and system performance.
SYMPTOM
POTENTIAL SOLUTION
Thermostat will not
allow me to program
a setpoint
temperature higher
than 90˚ F (32˚ C).
This is above the normal thermostat temperature setting range
of 45˚ to 90˚ F (7˚ to 32˚ C).
Thermostat will not
allow me to program
a setpoint
temperature lower
than 45˚ F (7˚ C).
This is below the normal thermostat temperature setting range
of 45˚ to 90˚ F (7˚ to 32˚ C).
Fan continues to run
all the time whether
the system is on
or off.
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
is turned on and running.
Check thermostat wiring to make sure that the fan control
wiring is connected to the correct terminals on the wiring
terminal block. See
Installation
and
Wiring Diagram
sections of
this manual.
LO
is shown in the
thermostat display
where the room
temperature is
normally displayed.
HI
is shown in the
thermostat display
where the room
temperature is
normally displayed.
The temperature sensed by the thermostat is higher than the
90˚ F (32˚ C) upper limit of the thermostats display range. The
display will return to normal after the sensed temperature
lowers within the 45˚ to 90˚ F (7˚ to 32˚ C) display range. Turn on
the cooling system or use other methods to lower the
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) in the heat mode.
TROUBLESHOOTING
6
cont.
SYMPTOM
POTENTIAL SOLUTION
TROUBLESHOOTING
6
Thermostat turns
heating or cooling
system on too often
or not often enough.
Increase or decrease first stage temperature differential setting
as appropriate to provide the desired performance level. See
Setting Temperature Differential
section of this manual.
Thermostat turns on
second (auxiliary)
stage of heating or
cooling too quickly or
not quickly enough.
Increase or decrease second (auxiliary) stage temperature
differential setting as appropriate to provide the desired
performance level. See
Setting Temperature Differential
section
of this manual.
ADDITIONAL
OPERATION FEATURES
5
5.4
cont.
5.5
Thermostat turns on
heating instead of
cooling, or cooling
instead of heating.
The temperature sensed by the thermostat is lower than the
45˚ F (7˚ C) lower limit of the thermostats display range.
The display will return to normal after the sensed temperature
rises within the 45˚ to 90˚ F (7˚ to 32˚ C) display range. If the
temperature in the controlled space seems to be normal, wait 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.
