I have a Warerfurnace Envision, just went out of warranty 3 weeks ago. I have a water flow fault. Outdoor temps are around 10F. I can reset it but only for a day or two and it locks out. I'm on aux heat now as the last time I ran it, it ran for 3 hours putting out 66F air. 4 ton, horizontal loop closed. Entering temps last night were 48F, exiting temps 43-44F. I installed the system myself just over 5 yrs ago, no issues on the heat or cool side until now. I'm about ready to call in a WF dealer as this appears to be beyond my skill level. I have read WF has had issues with the TXV which could create similar problems. Any thoughts or comments would be great.