central heating error code 31

bonehead

Premium Member
Joined
Mar 1, 2007
Messages
5
Location
northern california
i can't find a name anywhere on the unit, but i can have another look. (it's in the crawl space)
problem: no heat.
the unit starts up and delivers a code 12. after a short while (60 seconds?) the indicator light goes constant ON.

i think this is normal.
after a short while (30-60 seconds?) the unit delivers an error code 31.
some of the things to check on the fault diagnosis list on the cover panel are to do w/ the vent pipe. i was replacing the vent anyway, during which time i could feel air being pushed out.
i don't think it's a blockage issue.
any help geratly appreciated.
TIA
jerry
 
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