Pool and Spa
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Hello and welcome to JustAnswer!This is James, I'm a Pool & Spa Engineer with over 20 years of experience, and I'll be assisting you today.
Sorry to hear your appliance is having issues, please stand by while I find the answer for you, this is not an immediate service however I will try and respond as soon as possible.
Typically an oh or 0h error code relates to an overheat fault detected, this occurs where the appliance detects the water is above 42 degrees, and would not be safe to empty.
Start by powering off the hot tub for 1 hours let the water cool then turn it back on and see if the fault occurs when the heater is off, if it does then this points to a sensor fault where it occurs when the heater is running this points to an issue with the heater.