Ok I had this problem and the high limit switch HLS LED on
I googled the issue and watched a few YouTube videos and bought a new HLS and a new Manifold By-pass valve.
I worked on it today and the problem is the thermostat not the HLS or Manifold by-pass valve.
The HLS is a normally closed 135 deg F switch that is easy to test with a multimeter and hot water from the microwave - it opens at 135F
The thermostat is supposed to open at 125 deg F and mine was stuck closed - I can’t believe they are $40. I tested mine in a jar of near boiling water and it did not move at all.
The thermostat is easy to get at and should be the first thing to check based on my experience
I googled the issue and watched a few YouTube videos and bought a new HLS and a new Manifold By-pass valve.
I worked on it today and the problem is the thermostat not the HLS or Manifold by-pass valve.
The HLS is a normally closed 135 deg F switch that is easy to test with a multimeter and hot water from the microwave - it opens at 135F
The thermostat is supposed to open at 125 deg F and mine was stuck closed - I can’t believe they are $40. I tested mine in a jar of near boiling water and it did not move at all.
The thermostat is easy to get at and should be the first thing to check based on my experience