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After all sorts of trouble...it was working, circulating...every radiator heating....I was convinced that it had been a lack of water and pressure, it ran great for hours...then we woke up cold. The aquastat askes the pump to circulate at the call for heat...whether or not the blower and...

We have been workiing on this for 5 weeks so far. HVAC tech had no idea. I thought we had it fixed. Last night added water to system, brought pressure up. it worked great for hours. Every radiator heated, system came on and off as needed. Woke up this morning cold. Same thing, runs for...

So, after alot of reading and troubleshooting we have determined that the Taco pump only runs when the blower /burners are on. It is my impression that is is supposed to run off the inital call for heat, then the water temp determines the blower/burner coming on. So, is this a bad aquastat...

We had the same problem last year, system calls for heat..everything comes on and after 3to 5 minutes it shuts itself down. Last year the old Tech came out replaced the pressure switch and we were good. Same symptoms this year, old Tech no longer in business. I call a local reputable company...