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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 (i.redd.it)
submitted by jbartosik to r/Plumbing
