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Mixing Demand on Tekmar 361
I have a radiant floor heating system utilizing a Kitec manifold and a variable speed injection system that was built eight years ago to the Kitec specs. The controller is a Tekmar 361.
A few days ago I came home to very warm floors. I checked system and the supply water was hot; it's usually just lukewarm, even when the outside temp gets real cold. The Tekmar indicated a mixing demand, which as far as I know should not happen when the room is already up to temp. I checked all the settings and didn't see anything unusual. I shut down the variable speed injection pump and let the water circulate through the floor zones overnight. In the morning I turned on the injection pump and everything seemed to work fine . . . for about four days. I came home today and the system is trying to pump hot water through the floor again. The mixing demand indicator is on and the % indicator for the "Current output of variable speed injection pump" is maxed.
There <em>was</em> a power outage for a couple of hours the day before the floor was noticeably warmer. But in the eight years of living here we've had tons of power outages with no ill effects.
I'm not a tech (obviously), but can anyone here tell me in relatively simple terms) what might be going on? Or what I might be able to check?