Ren Hoek wrote:
I had to reset abreaker box breaker for my heatpump as the outside
unit stopped and the thermostat heat indicator just kept flashing. Can
a breaker wear out and not trip but still kill the power? I guess my
question is can a breaker show it's on but be tripped slightly?

Yes. I've experienced more than one breaker that was tripped but showed
no signs of it. This is especially interesting when working in an
unfamiliar building which has no labels (or inaccurate labels) in
multiple breaker boxes leading to endless hunting for the culprit.
Flipping the breaker off then on will reset it but in the long term it
needs to be replaced. Or I guess you could just live with it now that
you know which breaker is the problem.

--
John McGaw
[Knoxville, TN, USA]
http://johnmcgaw.com