Honeywell Tradeline Chronotherm IV Installation Instructions Manual page 10

T8611G CHRONOTHERM
Symptom
Cooling will not No power to the thermostat.
come on.
Thermostat minimum off time is
activated.
System selection is not set to
Cool.
Cool setpoint is above room
temperature.
Heating or cooling Heat or cool circuit is opening
come on up or becoming high
momentarily and impedance.
shut off
System on indicator Heating or cooling equipment is
(flame=heat, not operating.
snowflake=cool) is
displayed, but no
warm or cool air is
coming from the
registers.
Outdoor Option not activated.
temperature
a
not displayed
Outdoor sensor is connected
Outdoor
incorrectly.
temperature
a
display is incorrect
Wrong sensor.
a
Select models.
69-0936—1
®
IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTATS
Troubleshooting (Continued).
Possible Cause
• Check for 24 Vac between R and C.
— If missing 24 Vac:
— check if the circuit breaker is tripped—reset the
circuit breaker.
— check if the system fuse is blown—replace the
fuse.
— check if the power switch on the HVAC equipment
is in the Off position—set to the On position.
— check wiring between thermostat and HVAC
equipment—replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
• Wait up to five minutes for the system to respond.
• Enter Installer Setup number 33. Reconfigure minimum off
time (if required).
Set system selection to Cool.
Check cooling setpoint. Set cooling setpoint to desired
temperature.
Add resistor in parallel with load or install interface relay.
Verify operation of heating or cooling equipment in self-test.
Enter Installer Setup number 24 and set to 1. Thermostat must
have OT terminals and a C7089B1000 installed.
Refer to C7089B1000 installation instructions and check wiring
between the thermostat and sensor.
Replace sensor with C7089B1000 sensor.
10
Action