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Hi Gary whats the make and model of the Balboa spa?
It sounds like you have a short, start by checking the breaker.
Where are you checking the 240V, is this on the PCU within the spa?
Are you getting power on the other side of the relay within the control panel?
Are you getting anything across the 3A, 2mA and 10A fuses, and checked non of them have blown?
The 200mA fuse protects the transformer for the control panel.
It suggests either you have a faulty transformer or a fault with the control panel.
No problem, do let me know if I can be of any further assistance, my guess would be its a new PCB.