Customer has a on going issue where some times heat works and sometimes it doesn’t, found that aquastat is dropping voltages, barely have to touch aquastat relay and it kicks on, we replaced aquastat back in April of this year, I replaced it under warranty through Folkes, tested operation, boiler got up to temperature and shut off at 180 degrees, circulator kicked on, boiler dropped to 140 degrees and fired back up made sure supply and return pipes got hot which they did, also gave customer estimate to replace first floor and indirect zone valves showing signs of corrosion.