I have had my pool open for a few weeks now and just turned the heater on. My pool heated up to 75, then I noticed the HS error light was on. My heater is only a year old, i have a call into the pool builder but haven't heard back. Does anyone know if this is a part that commonly goes bad (so I should keep a spare on hand) or if it is a DIY fix? It looks like it should be simple enough to repair though I haven't looked into where to buy them or how much they cost.