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Miller cmf 80 problems

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wmechanic01
wmechanic01 Member Posts: 26
in Oil Heating
Hi there , I'm having a issue with my furnace not wanting to kick on however if I set the temp to 75 or above it works fine no issues at all, when lower it kicks on and will shut down on lockout . The furnace was just cleaned out and replaced nozzle to .50 80 A , for some reason after cleaned the flame was roaring it had a .579 witch I ran for years but once cleaned all the sudden this size was to much for it? So now my issue is with it shutting off when temp set below 75 I'm baffled any ideas

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  • lchmb
    lchmb Member Posts: 2,997
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    bad nozzle is possible. Have you had your tech back to check?
  • wmechanic01
    wmechanic01 Member Posts: 26
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    Swapped out nozzle was fine though, I'm thinking possibly a bad transformer that decides it dosent want to work sometimes , possibly thermostat but I have no clue
  • billtwocase
    billtwocase Member Posts: 2,385
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    Probably needs some new electrodes
  • Grallert
    Grallert Member Posts: 644
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    Start with the correct nozzle (.579) and a combustion test.
    M
    Miss Hall's School service mechanic, greenhouse manager,teacher and dog walker
    Alan R. Mercurio_3
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,506
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    What's a .579 nozzle? Never heard of one
    steve
  • billtwocase
    billtwocase Member Posts: 2,385
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    My guess is .57 90 degree Steve? Years ago the old millers used a 559, which was, if I remember, Sid Harvey's .55 90 nozzle. Generally a "W" was used in the old Wayne/Miller Guns
  • BornForDying
    BornForDying Member Posts: 40
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    Delavan .579 MH nozzle. Made specifically for mobile homes.

    https://www.amazon.com/Delavan-579MH-579MH-MOBILE-HOME-NOZZLE/dp/B008HQ4BZY
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,506
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    Being around this biz since the 70's, started officially mid 80's, I can honestly say I've never heard of that nozzle/nozzle designation. Learned something new.
    steve
  • billtwocase
    billtwocase Member Posts: 2,385
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    I will have to post a pic of a 559 nozzle. It is of Hago origin
  • billtwocase
    billtwocase Member Posts: 2,385
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    Hardly a good deal on that link above

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