We have a Rudd gas furnace. The Thermostat will come on and the fan would
run. However, there is no spark to light the burner. The igniter is
controlled by the Ignition Control Union (ICU) and it's not getting the 24V
that it's supposed to get from the transformer\limit control. I've checked
the transformer has 120V coming in and limit control has 110V coming in.
They both have ohm measuring around 170. Does this indicated that they're in
working order? If so, where else can I check to see why the 24V is not
coming over to the (ICU).
Do you have 24VAC from the transformer? If not, then you have a problem and
probably more than one.
ICU??? You mean ICB if its a Rheem/Ruud, but since you gave no information
at all that is required to tell you what may, or may not be wrong, then the
best place you can check is your Yellow Pages.
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