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Posted by Chris on January 27, 2007 at 12:04:24:
I recently had 2 of 3 zone valves (taco 571-2) replaced in my hot water baseboard system (gas boiler - burnham series 1) and a pressure relief valve. Since that time the boiler will percolate, mostly when it first starts. All air has been purged from all 3 zones. The aquastat is old (Honeywell L8148B) and has a manual auto switch that is set to manual. The expansion tank is fairly new and only fills partially when it is hot. I have a service contract with the gas company but they don't always have the best service technicians.