10 11
TROUBLESHOOTING
6
cont.
TROUBLESHOOTING
6
cont.
WIRING DIAGRAMS
7
SYMPTOM POTENTIAL SOLUTION
SYMPTOM POTENTIAL SOLUTION
Low battery indicator is
shown in thermostat
display.
Replace batteries immediately to maintain proper system
operation. See Low Battery Detection and Replacement, section
5.5 of this manual.
OFF is shown in
thermostat display and
heating or cooling
system will not start.
This indicates that the system is turned off at the thermostat.
The thermostat must be in HEAT or COOL modes of operation to
control the heating or cooling system. Move the system selector
switch to the HEAT or COOL position.
Thermostat display
is blank.
It is possible that the batteries are drained and not providing
power for the thermostat to control the system. Replace
batteries immediately to maintain proper system operation. See
Low Battery Detection and Replacement, section 5.5 of this
manual. If you replace the batteries and the display does not
appear, call a professional service technician to verify
thermostat and system performance.
Thermostat will not
allow me to program
a set point 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
set point 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 Diagrams sections
of this manual.
The room is too warm
or too cold.
See Review Set Temperature, section 5.1 of this manual to verify
the current set point and make any modifications that are
necessary.
LO is shown in the
thermostat display where
the room temperature is
normally displayed.
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.
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 thermostat’s 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.
System turns on
prior to the end of a
setback period.
Thermostat is in Adaptive Recovery Mode- (see section 5.6).
Typical 2-Wire 24 Volt AC or 250mV - 750mV Millivolt Heating Systems
Rc Rh GWY
O/B
Remove
Factory Installed
Jumper
Heat
Control
24 Volt AC
Transformer
or Thermopile
120
Volt AC
Hot Side
Transformer
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