Walked into my sisters home tonight and noticed a burning smell. The CI radiators were way hotter than usual and one of them had a slight hiss at the vavle stem.
The boiler's temp was at 240F, pressure about 22 PSI - so the relief valve wasnt blowing off. Is this most likely a failed aquastat relay? The aquastat is a Honeywell L8148 model, so there is a HI setting only, and a fixed differential @15deg. The HI setting dial is set to 180F (it hasn't been messed with since it was installed 2 years ago).
The entire plumbing system is only 2 years old (except the old radiators) - new Dunkirk boiler, Honeywell Aquastat, flue damper valve,taco zone valves, and grundfos circ pump.
The boiler's temp was at 240F, pressure about 22 PSI - so the relief valve wasnt blowing off. Is this most likely a failed aquastat relay? The aquastat is a Honeywell L8148 model, so there is a HI setting only, and a fixed differential @15deg. The HI setting dial is set to 180F (it hasn't been messed with since it was installed 2 years ago).
The entire plumbing system is only 2 years old (except the old radiators) - new Dunkirk boiler, Honeywell Aquastat, flue damper valve,taco zone valves, and grundfos circ pump.