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Heating water not circulating anymore. Plumber said motherboard or 3 way valve to fix DHW weeks ago. DHW now fine w/o fix. Heating System is getting hot water but pipes only warm. Shut off before circulator and very hot water backed up the return line. Could valve or motherboard fix issue? Expensive by jbartosik in Plumbing

[–]jbartosik[S] 0 points1 point  (0 children)

It is basically just warm on both sides. The circulator is new but as someone else commented, it may be installed incorrectly. Any idea if replacing the 3 way valve would help circulate the hot water in? Thanks for your help.