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Hi - I have a Burnham steam boiler/gas fired with a tankless coil/Honeywell aquastat. Hot water has quit working. If I bump up the low temp control on the aquastat, normally set at 120, to 130, the furnace fires for a few minutes then shuts off. Again to 140, the same. Again to 150 the same.
Steam heat is off. Water temp problem persists, heat off or on. Unit is around 17 years old.
Bad aquastat control?
Thanks - Mark