Honeywell T7350 Installation Instructions Manual page 7

Symptom
Temperature Upper or lower temperature limits were
settings will not reached.
change.
(Example:
Occupied setpoint temperature range
Cannot set
stops were configured.
heating higher or
Keypad is locked. When a locked key is
cooling lower.)
pressed, LOCKED appears momentarily
on the LCD.
Room Remote temperature sensing is not
temperature is working.
out of control.
Heat will not No power to the thermostat.
come on.
Thermostat minimum off time is activated. Wait up to five minutes for the system to respond.
System selection is set to Off or Cool.
Cooling will not No power to the thermostat.
come on.
Thermostat minimum off time is activated. Wait up to five minutes for the system to respond.
System selection is set to Off or Heat.
System indicator The call for heat or cool is not yet given.
(flame: heat,
snowflake: cool)
is displayed, but
no warm or cool
air is coming from
the registers.
Conventional heating equipment turns the
fan on only after the furnace has warmed
to a setpoint.
Heating or cooling equipment is not
operating.
Table 4. Troubleshooting Information. (Continued)
Possible Cause
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
Check the temperature setpoints:
• Heating limits are 40 to 90°F (7 to 31°C)
• Cooling limits are 45 to 99°F (9 to 37°C)
Using a PDA, check setpoint stops. If necessary,
reconfigure the stop(s).
• Use PDA (Set, Display) to unlock keypad.
• Press both Run Schedule and Copy, then change
keypad lock level.
Check all remote sensors.
Check that X terminal is connected to the system
transformer.
Check for 24 Vac between X and RH terminals.
If missing 24 Vac:
• Check if circuit breaker is tripped; if so, reset circuit
breaker.
• Check if system fuse is blown; if so, replace fuse.
• Check if the HVAC equipment power switch is in the
Off position; if so, set to the On position.
• Check wiring between thermostat and HVAC
equipment. Replace broken wires and tighten loose
connections.
If 24 Vac is present, proceed with troubleshooting.
Use PDA to configure heating response.
Set system selection to Heat or Auto.
Check that X terminal is connected to the system
transformer.
Check for 24 Vac between X and RH terminals.
If missing 24 Vac:
Check if circuit breaker is tripped; if so, reset circuit
breaker.
Check if system fuse is blown; if so, replace fuse.
Check if the HVAC equipment power switch is in the Off
position; if so, set to the On position.
Check wiring between thermostat and HVAC
equipment. Replace broken wires and tighten loose
connections.
If 24 Vac is present, proceed with troubleshooting.
Use PDA to configure cooling response.
Set system selection to Cool or Auto.
Check if any stage indicators (dots next to the system
indicator) are displayed. With no display of stage
indicators, no call for cool/heat is yet given.
For T7350M models only: Check the information
screens. A MODHEAT or MODCOOL percentage of
zero indicates a signal of 4 mA from the given terminal.
Wait one minute after seeing the on indicator and then
check the registers.
Verify operation of heating or cooling equipment in self-
test.
7
Action
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