"Bob" wrote in message
...
Hello,

I have a problem I'm hoping someone can help me with. We have a Bryant
Plus
80 with an Air Conditioner unit. I haven't used the Air Con for a few
days
and today I turned it on and there was no fan. I checked and found the
CPU
board just making a buzzing sound. I checked to make sure the fan spinned
freely, which it does. I checked to see if there was 24VAC from the
transformer and there is. I reseated all the connectors on the board, but
there was no change. I did not remove the board though, so the top
connections were not reseated, but they seem to be for the heating area.
One note I should mention is when the Electronic air cleaner filter was
connected to the 24VAC output of the transformer the motor was going on
and
off, so I put a regular air filter in and that solved that problem for the
moment. Now I'm wondering if the transformer is not putting out enough
power for the blower relay to kick on all the way, or if the relay is bad
and needs more power than it has been getting. I don't want to replace
the
board if I can repair it. I'd appreciate any help you can offer, so I can
test further.

Thank You,

Bob

Pulling the board could be expensive. Some boards can be pulled hot, most
are not.
Repairing the board may not be an option, unless you have a lot of
electronic experence. A lot of circuit boards are propitiatory now days.
Even going back 4-5 years.

Who was the rocket scientist that connected the filter to the power supply
to the a/c? Do not let him touch your system again.

The power, VA, available for contol power transformers is pretty limited.
With out knowing specs for all of the equipment it would be impossible to
guess what exactly is the matter. Gut says your air cleaner needs its own
voltage and current source. You could always try the smoke test, put in a
bigger control transformer and see how long it takes for the magic to
leave...

Humor is applied to response.