On Saturday, July 1, 2017 at 6:09:00 AM UTC-5, Sherlock.Homes wrote:
Seems to be 120vac from red to ground and 120vac from black to ground but no
voltage between red and black, which should be 240vac. Reading was taken at
the external dissconnect. What might cause this?

Thanks,
S


One leg is dead and you're reading voltage through the crankcase heater. make sure the disconnect is off before checking the voltage. Read the voltages at the circuit breaker feeding the external disconnect. One side could be tripped or there is a bad connection. Turn the breaker off forcefully to make sure it clicks and resets if it tripped before. Sometimes, a 2 pole breaker will trip and if you don't use enough force when you turn it off, one side may not reset. I've seen it happen more than once. ヽ(ヅ)ノ

[8~{} Uncle Broken Monster