Fantastic support from Pure Electric, as I have battled with a faulty Sanden for a year, after receiving no technical support from Sanden HQ or my retailer - a disgrace for a premium HW system that lasted only 5 years of a claimed 15 year life. Pure Electric have provided oodles of advice to keep it going; then repaired, tested and returned my faulty PCB which was fried by fluctuating supply voltage - apparently a common fault for which Sanden offers no solution other than purchase of a new unit.