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weil/mclain 3 399 goes off on high temp

Fatrat12 Member Posts: 1
has been going off on high temp often


  • lchmb
    lchmb Member Posts: 2,997
    edited January 2017
    Do you mean the ultra 399? series 3? If so, has the unit been serviced, how long has it been in service. Lp or natural gas? Has anyone looked at it? How often? once a day, every cycle? How about a picture of the system... This generally indicates a flow issue...