To help users set up, operate and resolve problems they may have with their Carrier Infinity thermostats, here is a clear troubleshooting and how-to guide addressing some of the commonly-reported issues with these controls.
How to Set Up and Operate a Carrier Infinity Thermostat
To set day, timer and desired humidity:
To adjust Heating temperature:
Check this too: Common Honeywell Thermostat Problems and How to Fix Them
To adjust cooling temperature:
Carrier Infinity Touch Thermostat Troubleshooting
If Infinity control does not power up:
If Display says “Indoor Unit Not Found:”
If display says “Outdoor Unit Not Found” (two-stage communicating outdoor unit):
How to Program Carrier Infinity Thermostat
One Schedule for All Days
To create one comfort schedule that will repeat every day follow the instructions below:
Daily Schedule
You can program a different schedule for each day of the week by using the SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, and SATURDAY screens. Similarly, you can create weekdays and weekend schedules by repeating steps 1-3 as described in the previous procedures, then selecting WEEKDAYS or WEEKEND respectively before proceeding.
Programming Fan Speed
You can select a different fan speed for each time period of your comfort schedule. Scheduling the fan speed follows similar basic steps as programming the time and temperature settings. Follow these steps to program the fan speed:
Carrier Infinity Thermostat Battery Replacement Guide
To replace batteries in a Carrier Infinity thermostat:
Carrier Infinity Touch Thermostat Reset System Malfunction
The functions of the Carrier Infinity System thermostat include monitoring your air filter, humidifier pad, and UV lamps. When any of these parts need maintenance, an alert will appear on the thermostat. To remove the alert from the screen, you need to reset the thermostat. Follow these steps to reset a carrier Infinity system thermostat:
Carrier Infinity Indoor Unit Communication Fault
If a communication error exists, or equipment cannot be found by the user interface, this may be due to a wiring problem with any of the components or accessories of the system. An indoor unit communication fault is displayed when the user interface has lost communication with the indoor unit. To troubleshoot the problem:
Check voltages and wiring.Perform communication bus troubleshooting to isolate the problem to the appropriate piece of equipment. Following these steps:If cannot find indoor unit, disconnect outdoor unit and all other devices on ABCD bus except indoor unit and user interface. Cycle system power.Is indoor unit found? If yes, reconnect one device at a time to ABCD bus. If a device is not found, check the device wiring and correct the wiring and reinstall the system if the there is a problem with the wiring. If the device wiring is okay but the device is not found, measure the voltage on ABC terminals at the device. It is possible the device has a problem.If indoor unit is not found, connect user interface to the indoor unit at the indoor unit. Check if the indoor unit is found now. If yes, check the wiring to the user interface mounting location.If the indoor unit is still not found, try another user interface and check if the indoor unit is found. If yes, check wiring to user interface mounting location. If no, measure voltage on ABC terminals at the indoor unit. It is possible the indoor unit has a problem.
Carrier Thermostat Error Codes
Fan coil generated system malfunction events:
Furnace generated system malfunction events:
For codes 13, 14, and 21, the system will use heat pump heating exclusively if available. When the error code is cleared or disappears, furnace heating will resume if still requested.
Outdoor unit generated system malfunction events:
User Interface generated system malfunction events:
Temp sensor failed, loss of communication with the smart sensor, smart sensor fault. “NO SENSOR DATA” shownIndoor unit communication faultOutdoor unit communication faultPacked product communication faultNIM communication faultSAM communication faultPossible Frozen CoilHigh Room Temp Alert, when 100oF exists for at least 10 minutes, and removed when less than or equal to 98oF existsLow Room Temp Alert, when 38oF exists for at least 10 minutes, and removed when greater than or equal to 40oF existsHigh Humidity Alert, when 80% Rh exists for 30 minutes, and removed when less than or equal to 78% Rh exists
Carrier Infinity Fault Code 178
Code 178 indicates Indoor unit printed circuit board, or 24-volt control circuit is non-functional. The issue may be caused by a bad thermostat, printed circuit board, or an oxidized wire connection. To troubleshoot the issue: If all checks out with the wiring, the outdoor circuit board could be faulty. This needs a professional to troubleshoot and fix.
Carrier Infinity Fault Code 44
A fault code 44 is a blower calibration fault. This fault indicates that the calculated blower motor speed is below 250 or above 1300 RPM.
Carrier Infinity Fault Code 196
The fault code 196—auxiliary input (G) shutdowns could indicate a few different things, basically, it is whatever the installer wired up the auxiliary alarm for, typically it is a backed-up drain (float switch or drain pan switch).
Carrier Infinity Fault Code 41
A fault code 41 indicates a blower motor fault. 41 codes may show up in fault history, but if the system is operating properly, this can be ignored. If motor LED is lit and flashing and the motor does not run:
Carrier Infinity Fault Code 179
If a fault code 179 appears on your Carrier Infinity thermostat, it indicates an outdoor unit communication error. To clear the error:
Carrier Infinity Not Cooling
Check the thermostat settings
Check the thermostat settings:
If the thermostat is set for heating instead of cooling the air simply adjust the thermostat so it is set to cool or change the setting to auto so it will automatically change between cooling and heating as temperatures change.If the fan is set to “on”, the fan will run constantly even when the system isn’t cooling the air. This could result in warmer air blowing from the registers when the AC unit is not operating. Changing the fan setting to “auto” will resolve the issue by turning off the blower when the system is not actively cooling. If it is set to “off”, simply select “on” or “auto”.Check the temperature setting to make sure somebody else didn’t change it to a higher setting.If you have a programmable thermostat, review your “comfort schedule” for any issues, and make sure your programmed settings still match the times and temperatures you expect when you are home, away and asleep.Air filter is dirty
Lack of maintenance can lead to a clogged filter and blocked airflow. These can lead to loss of efficiency, discomfort, or even system failure. Before checking your air filter, be sure the thermostat is set for cooling and that the temperature setting is correct. If you still suspect the problem is a dirty filter, remove and clean or replace your air filter.
Refrigerant level is low
The refrigerant in your air conditioning system could be below. If your thermostat settings are correct and your air filter is clean, you may have a leak or other issue that is causing the refrigerant levels to drop. If you suspect low refrigerant levels, contact your local Carrier dealer to troubleshoot the air conditioner for refrigerant-based issues.
Evaporator coil is frozen
Excessive buildup of dust, dirt, or other pollutants on the evaporator coil, excessively dirty or clogged air filter, excessive buildup of dirt, dust, or debris on the outdoor condensing unit, and low refrigerant levels are some of the issues that can lead to a frozen evaporator coil. As the evaporator coil is typically not easily accessible and troubleshooting an AC’s refrigerant levels should be handled by a professional, you should shut down the system and contact your local Carrier dealing when you have a frozen evaporator coil.
Electrical panel issues
If there is no air coming from the registers, the house is too warm, and the system is not running at all, you might have lost power to the system. To troubleshoot, locate your home’s electrical panel (breaker box). Look for a blown fuse or a tripped circuit breaker that is not in the ON position. Check this too: How to Change Batteries in Honeywell Thermostat
Faulty or broken condensing unit
A condensing unit might have an excessively dirty coil or refrigerant leakage. Other issues with the outdoor condensing unit might include a failing condenser fan motor, a faulty compressor, or a faulty run capacitor, Most of these AC problems require a professional.
Carrier Infinity Thermostat Replacement
Before installing, modifying, or servicing the system, the main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch. Lockout and tag switch with a suitable warning label. To install a Carrier Infinity thermostat replacement:
Thermal Lockout Code 82
If your outdoor unit generates a fault code 82, it means a Hi capacity thermal lockout. Thermal cutout occurs in three consecutive high cycles in new platform outdoor units. On older platforms, 2-stage units, or a combination of 3 hi and low cycles will cause this event.
Carrier Air Conditioner Reset Button
You may find your Carrier air conditioner needs resetting if it starts to malfunction, or refuses to respond to input via the control panel or remote. Resetting the AC restarts the internal computer and often restores the unit to normal working order. The exact instructions will vary depending on your Carrier AC model. Check this too: York Furnace Troubleshooting & How to Guide
