Thanks to other reviews I was able to reset my hot water heater. (Temp on High, Turn off, on, twist temperature knob down-up 5 to 7 times). When the unit first went into lock-out I thought I could detect a very faint smell a little gas right at the connection so I resealed the connection. After resealing the connection a reset worked for several days. Then it started need a reset once or twice a day. For about a week I kept watching and resetting as needed, worried I that I might still have a leak I couldn't smell. After researching I ran across two important pieces of information. First, the sensor uses a film that when exposed to flammable gasses changes resistance significantly, which explains why I needed to replace the sensor. Second, you can easily test if the sensor is bad with an ohm meter. The sensor should have a resistance between 7K ohms and 95K ohms. In my case the sensor measured over 150K so it was clear I needed a replacement. Knowing the senors's functional range I put a 33K ohm resister in its place, which is working, while I wait for the replacement part.
Rating:
[5 of 5 Stars!]