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Do you see any other numbers on furnace like DGA077 or DGAA?
Has he determined the limit is cutting burners off and keeping fan running? Or are you saying burners jeep going but blower is cycling on and off?
I can't find a manual on this one.I am going to open question to see if one of my colleagues may
this appears backwards.
replacing the limit would be if the burners were cycling off and on and the blower continued running. (blower that blows air through registers not out chimney).
Also putting doors off and on would affect the limit not the blower...
are you sure the burners are not what keeps cycling and the main blower for registers continues to run?
thats our toe stumper.....limits do only one thing...turn the burner off.
fan switches cycle blower on/off. But limits are not related to blower at all
you see that would be a limit issue.
If the main circulating fan shuts off then the problem is fan/blower related.
To me it sounds like your burner is turning off by overheat...this would be a limit issue.
Which a plugged ac coil is very common....can take panels off to the ac coil?