The spa is a 2002/03 Sumatran - IQ2020 system (running 220v). The heater relay board blew up, like they do, so it was replaced along with the heater. Everything else worked, and still works, just no heat. The big oooops was not pulling the jumpers off the heater relay board; it thought it was 110v while getting 220v. Yeah, so, it tripped the house breaker... the main house breaker(!) - The jumpers were pulled out so no more house breaker trip - and the board looks absolutely fine - there were no cracks, bangs or puffs of smoke. When I check with my voltage meter it shows 220v where the two wires go in to the board from the breaker - I get power on the black and red wire connections that go from the heater relay board to the main board (both boards show 220v) There is nothing (no power) to the connections for the heater on the heater relay board. No blinking lights on the top side, so I'm assuming this means the high limit and thermostat are good. I reset the breakers, ran just the 20amp breaker with the 30amp off for a while to see if it would reset... still nothing. Is it possible the main board needs to be replaced? Did I toast the heater relay board? Could it be something else? Thanks! Lori " title="Confused" />

You need to be 100% sure that you didn't fry the 30 amp circuit breaker, and it is indeed supplying power. Based on your description, I can't tell if you've checked exactly that.

This is a common problem with IQ2020 heater relay boards that I've relayed to the mfgr but to no avail, they still ship them in the base configuration so that if separate power sources are used, you'll get a direct short that'll fry everything in line that powers it. When this happens, you get anywhere from 1000 to 10,000 amps sudden short circuit current thru the circuit breakers depending upon line capacity - and thats why it tripped the main house breaker.

Check the output of the 30 amp breaker, with the 20 amp breaker turned off first. Be sure you're getting ~230v from it.

Thank you for the quick reply. Yeah, I was pretty irked with the jumper thing. The instructions said to "check jumpers". In my limited knowledge, a "jumper" is a little black thing for the tiny 2 pin settings, like on the main board. A picture would have been nice! Live n' learn. " title="Smile" /> I metered where the two hots go into the heater relay board from the 30 amp breaker - that part was fine. I didn't check it with the 20 amp breaker off - does that make a difference? Lori

Do it again.
20 amp breaker off.
Be sure you have 230v.

If the Sumatran has been converted from 110v to 220v then you still need to use one of the jumpers.

The board comes with both jumpers already in it, a two-pronged jumper between numbers 1 and 2...and a three-pronged jumper between 3, 4 and 5.

You need to take both out and re-install the 2-pronged jumper between terminals 4 and 5 on the board.

You should be all set after that.

Okay...

Pageup: with the 20 amp breaker off, the 30 amp breaker shows 230v.

Dan.the.spa.man: The lid on the control box says to have no jumpers in place for the Model L 220 v.

Is there anything else I can do/check? Thanks! Lori