On 8/23/2010 1:32 PM, ransley wrote:
On Aug 23, 7:33 am, wrote:
ransley wrote:
If there was a thunderstorm, a voltage spike could have blown the
run capacitor. If your air handler fan doesn't run, it's a power
problem there because the 24 volt control voltage comes from the
furnace/air handler. Without the 24 volts AC, the condensing unit
where the compressor is will not come on. If you can push in the
insulated contact carrier on the condenser contactor and the fan
and compressor run, you'll know it's not getting control voltage
from the furnace/air handler.

TDD

What does the condensor contactor look like where do I find it, I
wonder if the tech left a wire loose since it seems like it just has
no power. I do know I dont think it was installed with proper gauge
wiring , Its about a 60 ft run of 2 pieces of 10 ga and it rattles in
the pipe and at the breaker on turn on. All these years of rattling
could have loosened something.

It's the only (usually) relay-looking-gizmo in the outside unit. It supplies
power to both the fan (120) and the compressor (240). If both are not
working, the obvious culprit is the only thing they have in common - the
relay.

That said, it could be the relay itself is broken (fried, etc.) or the
voltage that activates the relay (24V) is missing.

If the relay, they're not TOO expensive and, if your hand fits a
screwdriver, you should be able to replace it. Label the wires - taking
several pictures is better - and take the old one to Graingers. Say "gimme
one like this".

Remember to wear eye and ear protection when working around electricity and,
um, er... one other saftey precaution, but I forget...- Hide quoted text -

- Show quoted text -

When I push in the relay it runs, so now I will go back out and see if
its getting 24v.

The low voltage wires going to the contactor coil are usually yellow in
color, sometimes one is blue which is the common.

TDD