may be a silly question but were is this v44? I ran a auto valve test and this is what came up Help

V44 is the post temperature thermistor on the 2008K. This would be on a machine with online clearance installation. Hope this helps.

same thing on an 2008H or something different?

V44 is the integrity of the system, Hydralic wise, id check some were in the Hansen lines, good luck.

run a positive pressure test and look for a leak...might be a bugger to find

I can't find a valve 44 on my K machines. Number 44 in the hydraulics diagram is a thermister, not a valve.

Valve 44 on the H machine refers to the air seperation assy. In my experience a leak is usually found at the valve on top of the assy or sometimes on the weld that holds the lower sensor pin. a positive pressure test should help.

GTS/RAI, hit it right on the nail. I've had this happen (more than once)after a yearly PM parts replacement. Turned out to be (my haste) the in-line filter housing, In-line with the bottom of the air-seperator and UF pump. Crazy thing, it would not leak out water. However, when attempting to calibrate the UF pump, I could not fill the burret. I ran the valve leak test, and valve 44 failure ocurred quickly. Hope this helps. If not, do the possitive & negative pressure tests, could be a broken UF pump spring, leaks at valve 43 or air seperator, and/or deaeration pump gone bad (check pressure).
Goodluck with all your endeavors.

I agree w/ Atlanta & GTS/RAI. The three most common causes I've found are:

1) As Atlanta said, the inline filter housing on the inlet tubing of the UF pump. The o-ring in the housing is NOT the same one that goes in the acid/bicarb wands. The inline filter housing o-ring (PN 671079) is slightly larger than the ones in the acid/bicarb wands (PN 579092). Using the wrong one will give you problems.

2) The Air Separator housing cover will get warped over time and not seal correctly. Sometimes you can get away with just replacing the cover, sometimes the body is warped too and will need replacement.

3) The bottom of the air separator will leak around where that little nipple is attached to the body.

You're best bet, as stated previously, is to run a positive pressure test and wait for the leak to rear it's ugly head. Be patient, however, because it can take a while to start dripping. I've waited over 5 minutes sometimes before the leak would show up. Good luck and let us know what you find.

Matt