Originally Posted by
KenEhresman
Ok, Aqua hot running once again... Talk about dangerouse, the input shaft on the fuel pump was worn and the seal shot and it was leaking fuel into the blower housing then down into the tray..... lucky it didn't ignite... replaced fuel pump with a spare used one, adjusted to 135 cold and put back together...
FWIW, i'm becoming somewhat of an expert on these since I have torn mine down so many times.... here is a list of very common failures I have come across
1. The Bearing wear out and the motor then doesn't spin correctly, catch it early and you are fine replacing them
2. The fuel pump has more than one issue, the input shaft seal as mentioned above, check all 4 top plate torx to ensure they are tight, have seen them loose, the o-ring under that cover also fails... all pretty easy fixes..
3. The plastic motor couplers fail at the input shaft, they are simple D shaped input shaft but then spin out resulting in no fan, or very low fan.
4. Diode failure on input to controller...
I have 2 extra controllers, a bunch of motors, coils, etc... so if anyone ever needs parts let me know.. some can be found on eBay but are expensive and rarely pop up... At this point I'd probably drop a couple grand on a brand new head, but can only find refurbs....MY .02 cents, if you have to service it, do it all, the first time... bearings, Seals, Couplers, etc... and hopefully be ok for another 100-200 hours of use.. lol