I have a Payne furnace. It was blinking a code 31, and so we replaced the pressure switch. It worked for about eight hours, and then it started blinking that code again. The furnace starts and runs for a couple of minutes, stops, and restarts over and over. What should I do next?


If the flue, inducer fan, and pressure switch hose are all free from obstruction and the hose is in tact and inducer fan is running at full capacity without too much water in it then I am guessing it could be the circuit board but cannot be 100% sure from here.

Updated on April 5, 2018

Original Article:

How to Diagnose Furnace Problems & Why Red Light Is Blinking
By Dan Robbins

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