Honeywell T7351F2010 Installation Instructions - Page 13

T7351 COMMERCIAL PROGRAMMABLE THERMOSTAT Table 7. Troubleshooting Information. (Continued) Symptom Possible Cause Action Heat will not come on. 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 • Wait up to five minutes for the system to respond. time is activated. • Configure heating response. System selection is set to Set system selection to Heat or Auto. Off or Cool. 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 • Wait up to five minutes for the system to respond. time is activated. • Configure cooling response. System selection is set to Set system selection to Cool or Auto. Off or Heat. System indicator The call for heat or cool is Check if any stage indicators (dots next to the system indicator) are (flame: heat, not yet given. displayed. With no display of stage indicators, no call for cool/heat is snowflake: cool) yet given. 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 Wait one minute after seeing the on indicator and then check the registers. Verify operation of heating or cooling equipment in self-test. equipment is not operating. 13 62-0258-05