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Posted by Rick on July 10, 2005, 3:23 pm
>
> > I have a 10 year old home with a Lennox HS24 central air unit.
When the
> > indoor thermostat calls for cooling (or heating) , neither the
furnace or
> > the a/c turns on. When I set the thermostat for cooling, I can
hear a
> > "click" as the unit attempts to respond but nothing happens (same
> situation
> > with the furnace for heat).
> >
> > I can control the fan (which does work) from the thermostat. I've
reset
> all
> > circuit breakers and the unit still does not run. I've checked the
outdoor
> > a/c unit for obstructions, frozen lines etc. and everything
appears (to a
> > layperson) to be OK.
> >
> > I've got a call into a local HVAC repair company but, given the
warm
> temps,
> > not going to be able to get anyone out for three days. Any simple
> > suggestions would be appreciated. We did have a power surge in the
house
> due
> > to a lightning storm that tripped a couple breakers a few weeks
ago. The
> a/c
> > did continue to function for several days afterwards. Would it be
worth my
> > time and trouble to replace the thermostat?
> >
> > Suppose to be in the high 80s next few days and I hate to have the
family
> > suffer in the heat if the solution is one I could readily tackle.
> >
> > Thanks!
>
> T-stat is not the problem since you can turn on the fan.
Not really-all it means is that he can turn the fan on manually. Says
nothing about the AC contactor or gas valve circuits..
To the OP, can you hear a clicking at the condenser (outside unit)
when the stat calls for cooling?
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