There usually is a relay and that is likely the problem. Replacing it
is generally easy, but if you are not sure where to start, then maybe
calling the service man may be a good idea.
I will make one very easy suggestion. Un-plug the unit and wait for a
few minutes. Then turn the power back on and see if it is working.
Sometimes it will get them going again. They have a type of computer and
that will reset it.
My suggestion is to replace the bulb again. I know I'm not the only one
who has replaced a burned out bulb with a defective one and then spent
hours chasing down an elusive and non-existent electrical problem before
thinking of replacing the bulb again.
Same goes for batteries.
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