Hi - I'm hoping to get some help with a somewhat sticky problem. A friend (locally well-regarded HVAC professional) installed our propane-fired boiler and 4 zone system. One zone is our domestic hot water. In the past year and a half four Honeywell L4080B aquastats have failed. My friend has replaced all but the third one for free. We are currently using gator clips to complete the circuit and run our hot water as needed. There has never been a problem with any other part of the system. Since the fourth aquastat stopped working I am trying to suggest that we delve a little deeper into the problem before just replacing another. He is understandably less than excited about my problem and I thought I might do a little leg work to see if anyone else has any ideas. The set-up is: NTI Trinity boiler, Taco SR 504 switching relay, Super Store Ultra hot water tank, and Honeywell L4080B aquastat. When the aquastat fails, it seems to do so gradually or intermittently rather than catastrophically. It also (to the best of our recollection) only seems to happen when we are using our very large, very inefficient wood stove in the basement. Ambient temperature in the basement gets up to approx. 110 degrees F at times. Any advice is greatly appreciated!

I have an old Ideal Elan boiler (over 20 years old) It just stopped working a few days ago. Out of fustration I hit it firmly :wall: and it started to work for 3-4 hours. Since than it only starts with a firm hit (!) and every time it stops it does not reignite on its own. But I am fed up with this kung fu business.:rolleyes: do you have any idea what could that be....pressure switch ajustment, airfun ? Meantime I am also looking for a a replacement boiler whithout rushing things,