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problem with millivolt boiler controls
I'm kinda confused with the whole thermopile and gas valve operation. i'm a younger hvac tech who has very little run in with them. anyways i have a utica 76,000 btu gas boiler. still has the oem L8148G aquastat and has an old honeywell gas valve with a thermopile. Problem is the pilot stays lit but the main gas doesn't. thermostat is calling and the circulator is running so the relay is pulled in from the aquastat. the thermopile is generating about 400-450mv tied in. what now? i jumped the high limit thinking it was that but still nothing. boiler temp of 100 degrees.