This is a Luxaire forced air gas furnace. Everything appeared to be
working fine for the last couple of months. Nevertheless, we got a
tuneup service done because we wanted to make sure that it was
performing well (we recently bought this house). The serviceman gave
it a clean report and said everything was fine.
On the first cold day after his visit (four days after the service
visit), the furnace started acting up. This is what happens:
1. There is a click in the gas control unit
2. The flame starts, and it looks clean (ie blue with very little
yellow), at least from what I can see through the inspection hole.
3. A few seconds later the fan starts
4. A couple of seconds after the fan start, I hear another click, and
the flame goes out.
5. The fan stops after about one minute.
6. After about two or three minutes, the cycle starts all over again.
As a result, there is hardly any heat. I figured that this frequent
on-off cycle every 3 minutes is not good for the unit, so I turned the
whole thing off. It has been very cold, so this problem needs to be
I find it very strange that the problem started on the first cold day
after the service visit. I called the company that serviced it, but he
said there will be a service charge for him to look at it again unless
the problem can be traced to his work. Of course, since I don't know
much about furnaces, I can't prove that it was his fault.
From the little I know, this sounds like a problem with the flame
sensor. If it is indeed the flame sensor, can I reasonably expect that
he should have inspected that during the service? I am inclined to
think that the furnace would be working fine today if I had not had it
Any advice on how I should proceed?