My Comfort Link Board is Not Working

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

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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.

The problem happens with this board from burnt wires shorting the input side, to a simple hardware glitch that can kill the board. A common misconception when you order the board from the counter is it’s programmed to your exact machine. That is not the case. RCD puts out a base file for the serial provided. A very good practice before changing the bad board is going through the old board configurations. It will take about 30 to 45 minutes on the scrolling marquee. When you hit a setting and you don’t know what it is hold Enter and Escape for about 5 seconds and the display will read it out to you. This also works for the navigator which is highly recommended if you work on a lot of these (Navigator Part Number 30GT-911—062). Once you have the settings, swap the Enable/OFF/Remote switch to off and let the machine shut down. Lockout the power and swap the MBB. Once the MBB is swapped return power to the unit. With the enable switch off, go through your configurations and verify there are the same as what you wrote down. Once that is complete set the enable switch to where it was before, and you are ready to go.

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.

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