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.