After 5 years of use, the old 3way valve didn't fully open the DHW side. I replaced the valve assembly and problem solved. BEWARE, while working on the AB155C, if the union before or after the heat exchanged leaks on you, the o-ring size you need is 35x3.5. Weil McLain does not have this PN in their diagrams, and is not included in the gasket kit.
MikeV
New Jeresey
6 months ago
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