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Miller cmf 80 problems

wmechanic01 Member Posts: 26
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