Hi this my 1st post. I have a 10 year old Hydropool. Pressure switch snapped and was replaced, still no heating. Controls appeared OK. Technician returned and replaced HP2000 circuit board ($429+time) noting " no power getting to heating element". I still have no heat. Am I being reasonable to ask them to prove to me that the old board was faulty (depending on what the eventual problem is, say it's wiring??) Appreciate any advice.