Is the dimming only on one lighting circuit or in various locations
throughout the house? If it is only on one circuit, I would want to check
for an improperly wired "multiwire branch circuit" which is two circuits
that share a common neutral. If you can open the panel, identify the
affected lighting circuit and the boiler circuit and see if they are
connected to a three wire cable, it would indicate this type of connection.
Aluminum single strand wire causes a lot of connection problems, however
they usually show up as a flickering situation, then go dead altogether



wrote in message
ups.com...
If the lighting circuit happens to be on the same circuit as the burner
he
should see some dimming when it starts. Not flickering though, that's an
altogether different situation. If the burner is on a dedicated circuit
and
he's getting dimming on a separate lighting circuit, he's probably got a
bad
connection on that leg of his service or possibly the neutral of the
service

The burner is on a dedicated circuit. I am seeing dimming on a
separate lighting circuit.

Does that mean the connection is bad on the lighting circuit or on the
burner circuit?

Michael