On December 15, right before Christmas the temp started to drop on all 3 zones when set at 70 degrees. It was still warm outside at 35 degrees and system was failing. The baseboards were luke warm and I heard gurgling sound at the boiler. Went down checked pipes they were still warm. During the night temp continued to drop and in the morning the pipes downstairs were cold. The boiler sounded like a car idling but I no longer heard water leaving the boiler and running through the pipes. Temp inside the boiler was oscillating between 167 and then would kick on and go up to set temp of 200, so the boiler was on but the water wasn't being pushed out. The outside gauge on the boiler read only 135 degrees. At that point I had no heat at all as pipes were cold. By the afternoon all of a sudden I heard water rushing through the pipes and all 3 thermostats rose to 70 to what they were set at. The gauge outside the boiler at that point was 185. Everything was fine from December 15 through Christmas - The day after Christmas it started to happen again and lasted until Wednesday then again heard water rushing through pipes and the heat rose to set temperature of 70 degrees. Outside Temp was "18 degrees". The heat remained at 70 all this week with windchill factor at 0 degrees outside. This afternoon it is happening again, all 3 thermostats are down to the low 60's and dropping as I write this. Temps tonight are going down to 0. Just to note - I did call a plumber who came out the first time, but said this boiler is complicated because it is a GV90+ as opposed to a CGA and said he needed to read my manual and left. I called Weil Mclain directly and they wanted the plumber to call their tech guys while he was at the boiler so they could walk him through trouble shooting - to-date he never called me back from when he left my home. I spoke to another plumber who also said he never worked on these new type boilers. This boiler was installed 3 years ago. I also added new baseboards 2 years ago around all exposed walls. The boiler is definitely capable or it would not have maintained 70 degrees with 0 windchill. Not sure why this is happening or what I should do? Should I lower the thermostats to allow the boiler to shut off for a little? - I'm afraid it will crash and stop working altogether.
Thank you.
Thank you.