I have a Laars propane fired baseboard hot water system with 4 zones baseboard and 2 radiant zones. The 4 baseboard zones have Taco flow check valves. Heat is sent to all zones when any thermostat activated. Plumber and I thought the flow check valves were at fault and plumber replaced all 4 yesterday. New day, same problem. Any ideas?
Heat to all zones
- Thread starter boulderz
- Start date
