Honeywell TB7220U Installation Instructions Manual page 15

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