The zones do get up to heat. Back in early november I tested the zone valves opening and closing with the thermostats calling for heat and all was good.coaledsweat wrote:Something is calling for heat in your zone circuits. Check the wiring on the TACO valves and the thermostats for proper function (on/off).Hollyfeld wrote:i disconnected the 2 wires from the TT Terminals and the pump stopped running
Are all your zones getting up to heat? A bad TACO power head will decrease the flow to the zone quite often, it never gets enough flow through the zone to get enough heat to shut down the thermostat. I just replaced the second power head in 15 years a few weeks ago. ALWAYS power off a TACO before servicing (or using the manual overide, but you need to pull the #1 wire if you have power) for at least 2 minutes before playing with it, damage will result if you do not. The head comes off with an anticlockwise 1/4 turn. About $75-80 for the operating power head if that is what is doing it.
I doubt you need a zone relay with that aquastat, I have the same setup with 3 zones and it works fine.
If something was calling for heat, wouldn't the stoker be activated at the same time?
Would a bad power head be calling for heat, but at the same time remain closed? I have two new power heads just laying around...somewhere.
IRT Steevesj - I've noticed that I need to have the boiler at 180/200 in order to maintain the heat in my house during these cold/windy days. I never knew what the oil boiler was set at when using that to heat the house, but I do know I never had a problem heating the house to whatever temp I wanted. I think during the install of the coal boiler, the controls on the oil were changed when we were playing around with them.