I have a 15 yr old custom built hot tub. It uses a PCB and heat element from hydra quip [9000 series] wired 240 volt. Less then a year ago the pcb failed so i replaced it...all good until a few weeks ago...no heat.
So far, i have checked all the fuses, main breaker, no error codes.
With a voltmeter across the heat element terminals i dont get 240 volts. If I measure one terminal and ground i do get 120 volt for each of them.
Continuity test shows closed circuit for the heater.