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coleman furnace open limit
QUESTION:I am an hvac contractor in nj . last night I went on a call where the
customer had a coleman gas furnace in which the gas valve kept shutting
off .the draft inducer comes on then the ignitor the furnace fires for
60 seconds then shuts off , the fan will run for about a minute or two
then it will repeat the whole sequence again. the light on the board was
blinking 4 times which according to the schematic meant that there was
an open limit . I used my meter to check all the limits they checked out
ok . has anyone ever ran into this problem with coleman could it be a
bad ground or a bad board ?
ANSWER: I've never seen a Coleman furnace and haven't done residential work for a
number of years.
That sequence sounds like failure to prove the flame.
If flame rectification through a little stainless rod, remove it, clean it
with Scotch Brite or whatever you have at hand, clean the pilot hood, then
go again.
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