Honeywell SERIES 2000 T7300D User Manual page 9

TROUBLESHOOTING GUIDE (Continued).
Symptom
Temperature Trying to set heating and
settings change cooling setpoints too close
from original together. There is a deadband
setting. in automatic changeover
thermostats. Example: cool
setpoint=72, deadband=3, heat
setpoint=68, changing heat
setpoint to 70 will automatically
change the cool setpoint to 73.
Room temperature Remote temperature sensing is
is out of control. not working.
Heating will not No power to the thermostat.
come on.
Thermostat minimum off time is
activated and wait indicator is
displayed.
System selection is not set to
Heat.
Cooling will not No power to the thermostat.
come on.
Thermostat minimum off time is
activated and wait indicator is
displayed.
System selection is not set to
Cool.
Fan operation set for 0
System on indicator
(conventional heat) when it
(flame=heat,
should be set for 1
snowflake=cool) is
(electric heat).
displayed, but no
warm or cool air is
Conventional heating
coming from the
equipment turns on the fan
registers.
when the furnace has
warmed up to a setpoint.
Heating or cooling equipment is
not operating.
T7300D SERIES 2000 COMMERCIAL MICROELECTRONIC THERMOSTAT
Possible Cause
• Check that the heating setpoint is lower than the cooling
setpoint.
Checkout all remote sensors.
• 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—reset the
circuit breaker.
— check if the system fuse is blown—replace the
fuse.
— check if the system switch at the equipment is in
the Off position—set to 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 38. Reconfigure minimum off
time (if required).
Set system selection to Heat.
• 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—reset the
circuit breaker.
— check if the system fuse is blown—replace the
fuse.
— check if the system switch at the 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.
Enter Installer Setup number 2 and reconfigure the fan
operation.
Wait a minute after seeing the on indicator and then check the
registers.
Verify operation of heating or cooling equipment in self-test.
9
Action
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