Honeywell VISIONPRO TH8320 User Manual download pdf (Page 38)

VisionPRO

8000 Touchscreen Programmable Thermostat

68-0280—01 38

TROUBLESHOOTING (TABLE 14)

Table 14. Troubleshooting.

Symptom Possible Cause Action

Display does not come on. Thermostat is not being powered. Check for 24 Vac between C and Rc.

Check that AAA batteries are installed

correctly and are good.

Temperature settings do not

change.

The upper or lower temperature limits

were reached.

Check temperature setpoints.

Check Installer Setup Numbers 0600 and

0610; modify as needed.

The keypad is fully locked. Check Installer Setup Number 0670 to

change keypad locked options.

Heating or cooling does not

come on.

Thermostat minimum off-time is

activated.

Wait up to five minutes for the system to

respond.

System selection is not set to Heat or

Cool.

Set system Selection to correct position.

System type Selection is incorrect. Check Installer Setup Number 0170 and

make sure correct System type is chosen.

Thermostat is calling for Heat

(Heat on) or Cool (Cool on) but

no heating or cooling is

running.

Heating or cooling equipment is not

operating.

Check wiring.

Check Installer Setup Number 0170 and

make sure correct system type is chosen.

Verify operation of equipment in System Test

mode.

Heat does not turn on (Heat

On is solid in the display).

Heating equipment failure. 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.

Loose or broken wire connection

between thermostat and heating

equipment.

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.

Cooling does not turn on (Cool

On is solid in the display).

Cooling equipment failure. 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.

Loose or broken wire connection

between thermostat and cooling

equipment.

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.

Fan does not turn on in a call

for heat (electric furnace).

Fan Control in Heating is set to Gas or

Oil Furnace (Setting 0180).

Set Fan Control in Heating to Electric Furnace

(Setting 0180).

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Honeywell VISIONPRO TH8320 User Manual Page 38

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