T7200D,E, T7300D,E,F AND Q7300 SERIES 2000 PROGRAMMABLE COMMERCIAL THERMOSTATS AND SUBBASES
63-4355—2 24
Table 14. Troubleshooting Information
(Continued).
Symptom Possible Cause Action
Temperature settings
change from original
setting.
Trying to set heating and cooling
setpoints too close together.
There is a deadband in automatic
changeover thermostat models.
Example: cool setpoint=72,
deadband=3, heat setpoint=68,
changing heat setpoint to 70 will
automatically change the cool
setpoint to 73.
• Check that the heating setpoint is lower than the cooling
setpoint.
• Check Installer Setup number 30 to identify the deadband
between heating and cooling setpoints. Reconfigure if
desired.
Room temperature is
out of control.
Remote temperature sensing is
not working.
Checkout all remote sensors.
Heating will not come
on.
No power to the thermostat. • Check that X terminal is connected to the system
transformer.
• Check for 24 Vac between X and R or RH terminals.
— If missing 24 Vac:
— check if the circuit breaker is tripped; if so, reset the
circuit breaker.
— check if the system fuse is blown; if so, replace the
fuse.
— check if the system switch at the equipment is in the
Off position; if so, set to On position.
— check wiring between thermostat and HVAC
equipment and replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
Heating will not come
on
(Continued).
Thermostat minimum off time is
activated and wait indicator is
displayed.
• Wait up to five minutes for the system to respond.
• Enter Installer Setup number 38. Reconfigure minimum off
time (if required).
System selection is not set to
Heat.
Set system selection to Heat.
Cooling will not come
on.
No power to the thermostat. • Check that X terminal is connected to the system
transformer
• Check for 24 Vac between X and R or RC and Y terminals.
— If missing 24 Vac:
— check if the circuit breaker is tripped; if so, reset the
circuit breaker.
— check if the system fuse is blown; if so, replace the
fuse.
— check if the system switch at the equipment is in the
Off position; if so, set to the On position.
— check wiring between thermostat and HVAC
equipment and replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
Thermostat minimum off time is
activated and wait indicator is
displayed.
• Wait up to five minutes for the system to respond.
• Enter Installer Setup number 33. Reconfigure minimum off-
time (if required).
System selection is not set to
Cool.
Set system selection to Cool.
System on
indicator (flame=heat,
snowflake=cool) is
Conventional heating equipment
turns on the fan when the furnace
has warmed up to a setpoint.
Wait one minute after seeing the on indicator and then check
the registers.
displayed, but no warm
or cool air is coming
from the registers.
Heating or cooling equipment is
not operating.
Verify operation of heating or cooling equipment in self-test.
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