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Honeywell Chronotherm III - T8621 Manual

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Program is lost due
to power outage.
Temperature change occurs
at the wrong times.
Heating will not come on.
IF. . .
Display will not come on.
THEN. . .
a
Check that heat or cool system power is on. If you use batteries,
replace with fresh ones.
n Make sure thermostat is correctly mounted on base.
Display flashes
during programming.
a
YOU
have reached the temperature setting limit
The setting range is
45°F to 88°F. In models with automatic heat-cool changeover, the
COOL temperature setting must be at least 3°F above the HEAT
temperature setting.
. Programming has been lost because of a power outage. You must
reprogram.
. Check that backup batteries are installed correctly. Replace if
necessary. Reprogram the thermostat
. 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.
.
Rememberthatthe
heating equipmentorairconditionercomeson
before the
MORNINGS
and EVENING
start
times so the house will
be at the desired temperature when the period starts.
n Checkthefuseorcircuitbreakerand replaceorresetif necessary.
n Check that switch on thermostat is set to HEAT or AUTO.
s,
Cooling will
not
come on.
The building is too
warm or too cool.
Display says HEAT ON or system
light is on, but no heat is coming
from the registers.
Display flashes REPL BAT or goes
blank when power is turned off.
n
Heatpumpthermostatshaveabuilt-in timedelay which may
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
displaysaysHEATONorSYSTEM light ison, contactyourheating
and air conditioning contractor.
. Check
thefuseor
circuit breaker
and
replaceor reset if necessary.
. Check that switch on thermostat is set to COOL or AUTO.
. The thermostat has a built-in time delay, which may add to time
delays in the cooling equipment Allow up to 10 minutes after
changing the setting before the air conditioner starts.
n If temperature setting is lower than current temperature, and
displaysaysCOOLONorSYSTEM light ison, contactyourheating
and air conditioning contractor.
w
Press PRESENT
SETrING
to check the current temperature
setting.
. If desired, change the time or temperature setting. See page 21.
.
Allowtimefortheheating equipmenttoheatupand thefan to come
on before checking for heat at the register.
. Install fresh alkaline batteries.
… 20 …


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