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I just bought a used 2005 Hot Spring Vanguard (VV) spa. It's in great shape, and according to the owner, they've not had any problems with it. I got it home and hooked it up, then filled it. First mistake, I just tossed the hose into the tub, so when I went to turn it on, there were no bubbles coming from the floor return. I used a hose and back flushed the system, blew out any air, and now get bubbles, but it will not heat. Jets work great, as does the light and the circulation pump, but no heat. No breakers are tripped, and it's not in summer mode (I've even turned summer mode on, then off again, hoping to reset it). I've reset the breakers about a hundred times, no change. Power light is on, but ready light never does. Temperature is set for 104 (though i've adjusted up and down), but water stays at 64. I can feel the water flowing through the tubes on the heater. As I understand it, the potential source of the problem could be: - 1. No power, or improperly wired power to heater - 2. No water flow through the heater - 3. Bad pressure switch (for sensing water flow through the heater) - 4. Bad limit switches (for determining when to come on/off) - 5. Bad heater - 6. Bad heater control board When I remove the cover on the IQ2020, I have a green light for "LIM OK", and a red light for "Heater On". The last light, "CONTROL UNPLUGGED" is not lit. I've examined the heater PCB on the left (which the incoming power leads connect to, as well as the heater power), and find no visible signs of burning or blown components. I test the power leads coming into the block (from the breakers), I get 123v & 125v across both legs, and 248v across the two legs together. I check the terminals for the black and white leads from this board to the heater (after removing the heater leads), I get 4V on the black one, and 125v on the white. I'm not sure if this is right (as the black goes through some components first), or if this is the problem. I checked the resistance between the black and white leads of the heater and get 9.8ohms I have a PDR heater, which according to this, has no reset button. http://www.teddybearpools.com/ask_the_bear/item/how_do_i_restart_my_heater.html Excuse the length of this, it's as much about explaining the problem, as validating from the experts that I properly understand the heater sub-system. Thanks!