I have 2 zones not sure which is which. I do have heat upstairs in my kitchen and my front room but not in the livingroom 2 bedrooms and 2 bathrooms what can it be The boiler does go on and the therostat is in the livingroom. I was told it can be slush in the pipes so I put on the wood burnning stove to see if it works but nothing. I was hoping that you can help me.