whity, do you have a re-circulation line, if not, start there. It is also possible if it has been like this all year that a check valve is stuck, in that case, remove the pump and run warm clean water thru it, then hook it back up again. If the diaphragm got damaged, change it. You want to keep a spare on hand at all times.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.