Hmm, that's an odd one. It could be either a fault with the PCB or the pump.
The first thing to check is the voltage to the twin speed pump. If that's ok the motor is probably the cause of the fault.
As always, with anything electrical you need to be very careful with what you're doing and if you're unsure seek professional help.
Regards,
Ian.
http://hottub.synthasite.com
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