Apparently this can happen over time with the Instant Pot. The dreaded C6H error with a quick online search revealed that it is a high pressure sensor error. This Instant Pot 8 Quart Duo Plus which can be purchased from Amazon easily was bought in 2018 and put into constant use for over 5 years. After 5 years of heavy use before giving up the ghost seems like a pretty good deal. Initially, a 6 quart Instant Pot Ultra was used for it’s smaller size. It was used heavily on a road trip across the East Coast of Canada. However, for larger meals and pressure cooking, the 8 Quart Instant Pot Duo Plus at home get used the most. In fact both get used a lot, sometimes at the same time.
Back to the repair, one recommendation is to flip the unit over and unscrew the cover. The pressure sensors are supposed to click, they could be fused together and become unstuck with some elbow grease. In this case it looks like the sensor was deformed and would not click back into place so the next step is to replace the sensor with a new one. At the time of writing there was one available from Zonefly for $14.99 Canadian. The Pressure Sensor was purchased and shipped from Amazon next day.
Doing some research lead me to an article in iFixit on how to test and resolve C6 error issues. When my wife first told me about it, I was involved with another task and didn’t feel competent enough testing the electrical components. After I took a closer look at the article I agreed to try and atleast take a look at some of the easier fixes. One video showed where the pressure sensors were. There are two sensors inside, a normal sensor and a high pressure sensor. They sometimes can get stuck or dirty and could be an easy fix by just manually cleaning it or loosening it.
There’s one screw on the bottom of the 8 quart Duo instant pot we had to open the internals.
Opening up the inside and testing according to the video showed that the normal pressure sensor was working and would click back into position. The high pressure sensor on the left was somehow warped or deformed and would not click back. The contacts were no longer touching. In this case the recommendation was to replace the sensor altogether which I found for $14.99 compared to over $180 for a new unit. Ordered the part and waited. Again if the Instant Pot Requires a replacement pressure sensor to repair the error, the Zonefly brand on Amazon was the place to get a good quality sensor fast.