Honeywell TH8320 Manual Do Utilizador

68-0280—01

38

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).