Troubleshooting - Honeywell VisionPRO 8000 Owner's Manual

VisionPRO TM 8000 Touchscreen Programmable Thermostat
TROUBLESHOOTING (TABLE14)
Table 14. Troubleshooting.
Symptom Possible Cause
Display does not come on. Thermostat is not being powered.
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).
The upper or lower temperature limits
were reached.
The keypad is fully locked.
Thermostat minimum off-time is
activated.
System selection is not set to Heat or
Cool.
System type Selection is incorrect.
Heating or cooling equipment is not
operating.
Heating equipment failure.
Loose or broken wire connection
between thermostat and heating
equipment.
Cooling equipment failure.
Loose or broken wire connection
between thermostat and cooling
equipment.
Cooling does not turn on (Cool
On is solid in the display).
Fan does not turn on in a call Fan Control in Heating is set to Gas or
for heat (electric furnace). Oil Furnace (Setting 0180).
Action
Check for 24 Vac between C and Rc.
Check that AAA 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.
Check Installer Setup Number 0170 and
make 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
)ower 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
)resent, the thermostat is functional. Check
the heating equipment to find the cause of the
)roblem.
Check for 24 Vac between the heat terminal
(W) and transformer common. If voltage is not
)resent, check wire connection (loose or
broken) between the thermostat and the
heating equipment.
Check for 24 Vac at the equipment on the
secondary side of the transformer between
)ower 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
)resent, the thermostat is functional. Check
the cooling equipment to find the cause of the
)roblem.
Check for 24 Vac between the cool terminal
(Y) and transformer common. If voltage is not
)resent, check the wire connection (loose or
broken) between the thermostat and the
cooling equipment.
Set Fan Control in Heating to Electric Furnace
(Setting 0180).
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