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TROUBLESHOOTING (TABLE 6)
Symptom
Display does not come
on.
Temperature settings
do not change.
Heating or cooling
does not come on.
Thermostat is calling
for Heat (Heat on) or
Cool (Cool on) but no
heating or cooling is
running.
Heat does not turn on
(Heat On is solid in the
display).
Heat pump puts out
cool air in the heat
mode and warm air in
the cool mode.
Both the heating and
cooling equipment are
running at the same
time.
Cooling does not turn
on (Cool On is solid in
the display).
TB7100A1000 MULTIPRO™ MULTISPEED AND MULTIPURPOSE THERMOSTAT
Table 6. Troubleshooting.
Possible Cause
Thermostat is not being powered.
The upper or lower temperature
limits were reached.
The keypad is fully locked.
Thermostat minimum off-time is
activated.
System selection not set to Heat or
Cool.
System type Selection is incorrect. Check Installer Setup Number 0170 and make
Heating or cooling equipment is
not operating.
Heating equipment failure.
Loose or broken wire connection
between thermostat and heating
equipment.
Changeover Valve (Installer Setup
Number 0190) is not configured to
match the changeover required by
the installed heat pump.
The heating equipment is not a
heat pump but the System Type
(Installer Setup Number 0170) is
set to Heat Pump.
Heating and cooling wires are
shorted together.
Cooling equipment failure.
Loose or broken wire connection
between thermostat and cooling
equipment.
Check for 24 Vac between C and RC.
Check that AA batteries are installed correctly and
are good.
Check temperature setpoints.
Check Installer Setup Numbers 0600 and 0610;
modify as needed.
Check Installer Setup Number 0670 to change
keypad locked options.
Wait up to five minutes for the system to respond.
Set system Selection to correct position.
sure correct System type is chosen.
Check wiring.
Check Installer Setup Number 0170 and make
sure correct system type is chosen.
Verify operation of equipment in System Test
mode.
Check for 24 Vac at the equipment on the
secondary side of the transformer between power
and common. If voltage is not present, check the
heating equipment to find the cause of the
problem.
Check for 24 Vac between the heat terminal (W)
and transformer common. If 24 Vac is present, the
thermostat is functional. Check the heating
equipment to find the cause of the problem.
Check for 24 Vac between the heat terminal (W)
and transformer common. If voltage is not
present, check wire connection (loose or broken)
between the thermostat and the heating
equipment.
Set Changeover Valve (Installer Setup Number
0190) to match the changeover required by the
installed heat pump.
Set System Type (Installer Setup Number 0170) to
match the installed heating and/or cooling
equipment.
Separate the shorted heating and cooling wires.
Check for 24 Vac at the equipment on the
secondary side of the transformer between power
and common. If voltage is not present, check the
cooling equipment to find the cause of the
problem.
Check for 24 Vac between the cool terminal (Y)
and transformer common. If 24 Vac is present, the
thermostat is functional. Check the cooling
equipment to find the cause of the problem.
Check for 24 Vac between the cool terminal (Y)
and transformer common. If voltage is not
present, check the wire connection (loose or
broken) between the thermostat and the cooling
equipment.
15
Action
62-0273—07
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