Manual Honeywell Chronotherm III - 69-0690 (page 26 of 30) (English)

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TROUBLESHOOTING GUIDE

IF… THEN…

Display will not come on. ■ Check that heat or cool system power is on. You need 24V from R to C

terminals.

■ Make sure thermostat is correctly mounted on subbase.

Display flashes during programming. ■ You have reached the temperature setting limit. The setting range is

45° F to 88° F.

Display flashes during operation. ■ Programming has been lost because of a power outage. You must

reprogram.

Program is lost due to power ■ Check that backup batteries are installed correctly. Replace if necessary.

outage. Reprogram the thermostat.

Colon in display does not flash. ■ Check for 24V from R to C terminals on the subbase.

■ Make sure thermostat is mounted correctly on the subbase.

Temperature change occurs ■ Check for ▲ ▲ on display screen. If ▲▲ is present, check your external

at the wrong times. system for the command that is bypassing the thermostat program.

■ Check the program times for the period in question. Be sure that AM and

PM indications are correct. Make sure the current day and time are

correct. Reprogram if necessary.

■ Remember that with Adaptive Intelligent Recovery the heating or

cooling system comes on

before

the WAKE and RETURN start times

so the house will be at the desired temperature when the period starts.

■ Check if T8631A is set for Conventional Recovery ( ■ ■ visible on display)

or Adaptive Intelligent Recovery.

Heating will not come on. ■ Check the fuse or circuit breaker and replace or reset if necessary.

■ Check that switch on thermostat is set to HEAT.

■ T8631R has a built-in time delay which can add to time delays in the

heating equipment. Allow up to 10 minutes after changing the setting

before the compressor starts.

■ If temperature setting is higher than current temperature, and display

says HEAT ON or SYSTEM light is on, contact your heating and air

conditioning contractor.

Cooling will not come on. ■ Check the fuse or circuit breaker and replace or reset if necessary.

■ Check that switch on thermostat is set to COOL.

■ The thermostat has a built-in time delay, which can add to time delays in

the cooling equipment. Allow up to 10 minutes after changing the setting

before the compressor starts.

■ If temperature setting is lower than current temperature, and display says

COOL ON or SYSTEM light is on, contact your heating and air

conditioning contractor.

The building is too warm or too cool. ■ Press PRESENT SETTING to check the current temperature setting.

■ If desired, change the time or temperature setting. See page 21.

■ Check for ▲▲ on display screen. If ▲▲ is present, check your external

system for the command that is bypassing the thermostat program.

Display says HEAT ON or system ■ Allow time for the heating equipment to heat up before

light is on, but no heat is coming checking for heat at the register.

from the registers.

Display flashes REPL BAT or ■ Install fresh AAA alkaline batteries. See page 23.

goes blank when power is turned off.

the Thermastat iss completely dark and furnace not working
Submitted on 8-2-2020 at 15:43
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Honeywell Chronotherm III - 69-0690 Manual

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