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T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT
Automation and Control Solutions
Honeywell International Inc. Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9
customer.honeywell.com
® U.S. Registered Trademark
© 2007 Honeywell International Inc.
62-0258 J.I. 01-07
Heat 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 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.
Thermostat minimum off time is
activated.
• Wait up to five minutes for the system to respond.
• Configure heating response.
System selection is set to Off or
Cool.
Set system selection to Heat or Auto.
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 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.
Thermostat minimum off time is
activated.
• Wait up to five minutes for the system to respond.
• Configure cooling response.
System selection is set to Off or
Heat.
Set system selection to Cool or Auto.
System indicator
(flame: heat,
snowflake: cool)
is displayed, but
no warm or cool
air is coming
from the
registers.
The call for heat or cool is not yet
given.
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.
Conventional heating equipment
turns the fan on only after the
furnace has warmed to a setpoint.
Wait one minute after seeing the on indicator and then check
the registers.
Heating or cooling equipment is
not operating.
Verify operation of heating or cooling equipment in self-test.
Table 7. Troubleshooting Information. (Continued)
Symptom Possible Cause Action