9. Troubleshooting And Support

Display is blank

  • Check circuit breaker and reset if necessary.

  • Make sure power switch for heating & cooling system is on.

  • Make sure furnace door is closed securely.

  • Make sure fresh AA alkaline batteries are correctly installed.

Heating or cooling system does not respond

  • Press Mode button to set system Heat. Make sure the desired temperature is set higher than the current indoor temperature.

  • Press Mode button to set system Cool. Make sure the desired temperature is set lower than the current indoor temperature.

  • Check circuit breaker and reset if necessary.

  • Make sure power switch for heating and cooling system is on.

  • Make sure furnace door is closed securely.

  • Wait 5 minutes for the system to respond.

Temperature settings do not change

  • Make sure heating and cooling temperatures are set to acceptable ranges:

    • Heat: 40 °F to 90 °F (4.5 °C to 32.0 °C)

    • Cool: 50 °F to 99 °F (10.0 °C to 37.0 °C)

“Cool On” or “Heat On” is flashing

  • Compressor protection feature is engaged. Wait 5 minutes for the system to restart safely, protecting the compressor from possible damage.

Aux heat runs in cooling

Cool runs with a call for heat

 

For assistance with this product, please visit customer.resideo.com.

Or, call Resideo Customer Care toll-free at 1-800-468-1502.