ok EDIT - shit sorry, im thinking gas furnace not water heater, never mind!~
is it lighting the burner at all? as in, does it light and then go out?
or just it just continually try to cycle without the gas valve ever opening? ( if there is a pilot light, it will light the gas burner when 24Vac is put to the gas valve)
it is the control modules job, to open the gas valve for usually 4 seconds, then wait for the flame sensor
flames sensed, gas valve stays open until thermostat is satisfied.
no flame sensed, gas valve closed, and cycle starts over
usually 3 cycles ( attempts to light) , with a 30-40 seconds purge ( fan on) in between until a lockout occurs.
after lockout, you will have to remove power from the control board for 45 seconds or so to reset it.
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mouthfulloflake screwed with this post 01-06-2013 at 02:11 PM