I have a 42amp heat pump load on on both leads of a 50 amp double breaker, 240 vac. Lug connections are tight. After a year or so of no problems, this breaker has started to trip occasionally. The breaker heats up but not so hot that to touch is painful. Wires (awg 8, I think) do not appear to be heated.
Is this normal for this load/breaker ratio?
Any help will be appreciated.