No flow sign on jandy heat pump, pump won't start or reset

you probably have the heat maintain on turn off all will be fine

This is pretty common for LOW FLOW through the heater. Most of the time, homeowners turn the bypass the water away from the heater and this reduces the amount of water flowing through the heater. Check the bypass to ensure that you have enough water flowing through the heater.
There is nothing else that will throw this code unless the flow sensor is bad altogether.
Once you have inspected your bypass, and the code reappears, you will need to have the heater inspected and possibly change out the flow sensor.

Verify circulating pump is on and that there are no water flow restrictions to the heat pump. Make sure all necessary valves are open or in the proper positions to allow proper water flow to the heat pump. Verify filter and skimmers are clean. Check for water level in the pool. This condition may also appear if the heat pump has not been operated for an extended period. To clear the condition, cycle the heat pump, on and off, up to 3 times. If this does not correct the problem, call for service.

The heater won't fire up if there is no or inadequate water flow. Ck water pump and filters.

IF FILTER CUP IS NOT FILLING COMPLETLY THERE IS A AIR LEAK CHECK ALL HOSES AND FILTER FITTINGS

Sounds like your motor is overheating, This is a sign of windings going bad and sorry to say you will probally have to replace the motor.

It could be that there is a low pressure or low flow condition (water). Make sure the filter is clean and water level in pool is proper. Also the temp sensor may be failing.