I just replaced the reversing valve on an old Tempstar package unit. DAMN... the cost of the job would've half replaced the unit, but the owner sez no. So you do the work, and only warrant that part, no?
It's a pilot-operated valve.
Anyway, what I am curious is, what is the mode of failure on these valves? One assumption I could make is that one of the pilot lines - almost as small as capillary tubing - has become clogged. The armature in the pilot valve moves freely and hits both seats with authority.
If there isn't a general consensus on why these fail, I'll probably dissect it on my own time to try and figure it out.
And no, I don't want to fix it. I just want to understand why it failed. If they do fail from grod in the pilot lines, it seems to me it's just an invitation for a new valve to fail in the same way.
Ideas?
LLoyd