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249 VAN Launch Kit 249 VAN Consumer Brochure Smart Thermostat Sell Sheet 249 VAN Launch Kit

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View Quick Start Guide

This installation was on a 4-story home, and the tech had not yet gone to the basement to troubleshoot the “infinity” water source heat pump, as he was told he by the homeowner. He was in the attic at the infinity furnace above the 4th floor. He was getting his dcv in the proper range on his A and B green plug on the air handler, 3 to 4 vdc. His indoor board ohm reading was in range, 28k to 32 k. The tech ohmed out the A and B thermostat wires on the water source heat pump from the upstairs. His ohm reading was not in range of a normal infinity board. His reading was around 64.4k. The tech then made the long walk to the basement where the “geothermal heat pump” was located. Bingo. 

Disclaimer: The technical statements, information and recommendations contained herein are believed to be accurate as of the date hereof, but Mingledorff’s does not make representations or warranties, express or implied, as to its accuracy, its completeness, or the results to be obtained. The information is being provided for informational purposes only and is intended for use by persons having adequate skill and expertise regarding the proper selection, use and application of the products and recommendations and at their own risk and discretion. 

Portrait of a smiling man in a blue polo shirt against a white background

Kevin Thigpen

Technical Services Manager North Alabama District

May 1, 2020

How to Reset Fault Codes in Controller

Mingledorff’s Technical Service Group would like to share these steps on how to clear faults from the Carrier Infinity® System Control ) and/or Bryant Evolution® Connex™ Control, and reset HVAC fault codes.


Our Technical Services Group gets calls where a Service Tech doesn’t know how to clear HVAC fault codes stored in these controllers. This information will be helpful in showing the steps needed to clear faults stored in either controller.

Thermostat touchscreen showing 74°, with red arrow pointing to the menu button and a “Press Menu” label.

Step 1



From the main screen push the arrow on bottom right side of screen.


Handheld device menu screen with app icons, highlighted by a red arrow and “Press and hold 10 sec” callout

Step 2


You will see a baseball cap. Press and hold for 10 seconds
(note the screen will change).


Menu screen with a red arrow pointing to the down-arrow navigation button.

Step 3


You are now in the installation and service screen. Press the arrow on bottom right.


Press Setup button, arrow to installation service menu on a black screen.

Step 4


Select "setup".


Press Setup button, arrow to installation service menu on a black screen.

Step 5


Select "thermostat".


Step 6


Select "reset factory defaults".


Settings screen with a green “yes” toggle selected; arrow says “Change to Yes and save.”

Step 7


Under "last 10 faults", select "yes".


By following these steps, you will be able to reset the HVAC fault codes in the controller.

249 VAN Launch Kit 249 VAN Consumer Brochure Smart Thermostat Sell Sheet 249 VAN Launch Kit

Unlock the Full Potential

View Quick Start Guide

This installation was on a 4-story home, and the tech had not yet gone to the basement to troubleshoot the “infinity” water source heat pump, as he was told he by the homeowner. He was in the attic at the infinity furnace above the 4th floor. He was getting his dcv in the proper range on his A and B green plug on the air handler, 3 to 4 vdc. His indoor board ohm reading was in range, 28k to 32 k. The tech ohmed out the A and B thermostat wires on the water source heat pump from the upstairs. His ohm reading was not in range of a normal infinity board. His reading was around 64.4k. The tech then made the long walk to the basement where the “geothermal heat pump” was located. Bingo. 


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