[Richard L]

If you see 8 bars across, you would have tripped the WH failsafe. I thought you would know that already over seven months of use.

When you do the test, you must put a nozzle or two and calibrate the SC to suit.

I still do not know why the transistor failed. Let me have an update. I suggest putting a new transistor in. Before careful. Mos transistors are very sensitive to static electricity. Make sure the soldering iron is grounded.