TB7220U ULTRASTAT PROGRAMMABLE THERMOSTAT
15 62-0223—1
Fan does not turn on during a
call for heat.
System does not control the fan and
Heat Fan Operation is set for it to do so
(ISU 0180 set to 0).
Set Heat Fan Operation for the thermostat to
control the fan (set ISU 0180 to 1).
Heating equipment is running
in the cool mode.
Heating equipment is not a heat pump
but System Type (ISU 0170) is set to
Heat Pump.
Set System Type (ISU 0170) to match the
installed heating and/or cooling equipment.
Heating equipment does not
turn off and heat temperature
setting is below room
temperature (Heat On is not in
the display).
Heating equipment is not a heat pump
but System Type (ISU 0170) is set to
Heat Pump.
Set System Type (ISU 0170) to match the
installed heating and/or cooling equipment.
Cannot adjust the system
setting to Heat.
System Type (ISU 0170) is set to Cool
Only.
Set System Type (ISU 0170) to match the
installed heating and/or cooling equipment.
Cannot adjust the system
setting to Cool.
System Type (ISU 0170) is set to Heat
Only or Heat Only with Fan.
Set System Type (ISU 0170) to match the
installed heating and/or cooling equipment.
Heat On is not in the display. System setting is not set to Heat and/or
temperature setting is not set above
room temperature.
Adjust the system setting to Heat and set the
temperature setting above the room
temperature.
Cool On is not in the display. System setting is not set to Cool and/or
the temperature setting is not set below
room temperature.
Adjust the system setting to Cool and set the
temperature setting below the room
temperature.
Wait is in the display. Compressor minimum off timer is
active.
Wait up to five minutes for the cooling or
heating (heat pump) equipment to activate.
Table 6. Troubleshooting. (Continued)
Symptom Possible Cause Action
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