Suburban hot water heater shuts off before hot
So I just bought my Stealth in June, and my hot water heater has been giving me problems the 3 times I have used it. It fires up once turned on but sometimes shuts off and never fires back up. Or possibly fires back up after the tank starts emptying...haven't tracked down all that happens to cause the problem. All I know is that it fires up enough to get hot at some point but other times it is just barely warm (probably residual heat). The other night after inspecting everything we couldn't get it to fire back up. The heating tube was full of what looked like metal debris from the tube coating (I assume?). I got out as much as I could and then we finally got it to fire after waiting, flipping the switch on and off, etc. But it never fully heated up because it was shut off and the water was still only warm by the time a friend showered about an hour later. After that I pulled apart as much as I could to try and clean out everything and it re-fired for my last shower before I went to bed. It had enough heat for a hot shower but was getting cold at the end. The next morning I woke up and the water was cold again.
The manual I have is for SW4D, SW6D, etc. I did notice something that looks odd but maybe it's how it is on my model: I just have one reset button on the unit and there is no cap on the other side (just the hole). Is this normal? Open to any suggestions someone may have.