I was thinking about it simply being the locked rotor from the A/C plus the water heater element.
I had a similar problem on my first call at IBM (1966), on a 3 phase, multi motor, machine with multiple motors ... missing a phase. I didn't notice the bigger motors running slow but the tiny one was running something with a timing disk on it that had an error so I started there, scoping timing pulses.
I didn't think I was missing a phase. I was getting something on all of them to ground. I saw still scratching my head or perhaps a more southerly region, when another guy came in and said "those motors don't sound right, you lost a phase kid".
