Call Craig Caulkins @Stabilized Marine. Not much he doesn’t know about Naiads & incredibly kind & sensible advice/support. Took the time to walk me through troubleshooting, potentiometer testing and eventually replacement of my ECU (with a rebuilt model - full warranty at very reasonable price.) Even sent me parts to substitute as part of the troubleshooting with no credit card info. Totally restored my faith in customer service. Be sure to call him before you try to remove the pot. otherwise you risk damaging the plastic connector underneath it ($$$).