I bought a used tub, filled it up bled the lines and turned it on. The heater works fine but when I turn on the jets I get the PSoC message. I read online about a garden hose trick.The circulating pump was quiet until I stuck the garden hose into the filter. It started to hum then and it also got warm. I tried the jets again and still got the error code. I dont know anything about hot tubs so I unplugged it. Can I run the heater without the circulation pump?