If a timer is preventing the equipment from turning on, the display icons which show the equipment is operating, will be flashing to indicate a turn-on delay is present. There are several internal timers which influence the thermostat’s operation. There are icons flashing on the thermostat display There is an option in the advanced configuration setup to display set point and room temperature. My Thermostat does not show room temperature Check reversing valve option above in the configuration setup Most likely, the reversing valve is setup wrong in the advanced configuration. My Heat Pump unit is operating in cooling when it should be heating NOTE: With or without batteries, any previous changes to the settings will be saved when there is a power outage This means that even though your heating and cooling system doesn’t work, you will still be able to monitor the room temperature. This can happen manually by setting the mode to Em Heat or automatically, if the unit can not keep up with demand running in heat pump modeĭisplay the indoor temperature because it has a battery backup power source. When it is displayed, it means the unit is heating with the electric heater. It applies only to the heat pump version. “Aux heat on” is displayed (heat pump systems only)Īux heat on is auxiliary heat. If your thermostat is battery powered and you wait until the icon is just a silhouette with no black bars, you will slowly lose thermostat functions until it doesn’t work at all. Replace it when one-third of the icon is black. The battery icon appears on the display only when the battery starts to lose power. If 24 vac is not present, replace the thermostat.Ĭarrier PTACSTAT-NP-HP thermostat troubleshooting If present, thermostat is operating correctly and problem is with wiring or equipment. Increase heating set point to 10 degrees above room temperature. Check for Compressor Cycle per Hour Limit. If 24 vac is not present, replace the thermostat.
Decrease cooling set point to 10 degrees below room temperature. Reset the Service Filter feature to reset the blower operation timer to 0 hours. This reminds the owner to replace the filter. “Service Filter” Is Displayed On Thermostat.Īfter the configured number of blower operating hours, the Service Filter message will be displayed. Terminal R must be connected for proper thermostat operation. If no faults are active, the Status screen will show status of each component in the system.Ĭarrier AQUAZONE 50QE900 thermostat troubleshootingĬheck for 24 vac at the R terminal connection. This will display the current active system faults.Ģ. Press and hold the right side button for 3 seconds. Perform the Zone Airflow Limit Checkout procedure, lower airflow limit setting if pos-ġ. The zone airflow limit may be set too high. Some zones prov ide too much airflow and are noisy.ġ.
Perform the Zone Airflow Limit Checkout procedure, raise airflow limit setting, if possible. The zone airflow limit may be set too low. (A noticeable difference exists between the actual room temperatureĪnd operating setpoint, yet the equipment docs not turn on).ġ. Some zones in my zoned system do not provide enough comfort. Make sure zone module 1 - 4 has the DIP switches set to the left. Recheck wiring to the ABCD connectors.Ĭontrol says I have zones 5-8 but not 1-4.ġ. Make sure zone module 5 - 8 has the DIP switches set to the right.Ģ. Press the right-side button the screen will prompt you to press the right side again to re-install the system.ġ. Press the ADVANCED button for at least 10 seconds.Ĥ. I made a mistake on the start-up screens, and hit the right-side button to get to the run mode. Check for 24VAC between the C and D terminal connector of outdoor unit. Recheck wiring to ABCD connector on outdoor unit.ģ. Add other devices one at a time to determine where the communication issue exists.ĭisplay says “Outdoor Unit Not Found”, and I have a two-stage communicating outdoor unit.ġ. If display still reads “Indoor Unit Not Found”, disconnect accessories and all devices from ABCD and connect User Interface directly to indoor unit with a short piece of thermostat wire. Check fuse on indoor unit’s circuit board.Ĥ. Check for 24VAC between the C and D terminals at Infinity Zone Control terminal connector and Damper Control Module.ĥ. Make sure power is applied to the indoor unit, and the amber LED is lit on indoor control circuit board.Ĥ. Make sure all colors match for every terminal.ģ. Carrier infinity thermostat troubleshootingġ.
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