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Need to trouble shoot hottub 850 controller (6600-092) No power across heater terminals - new heater. temp sensor and high limit at ~ 30Kohms. flow switch good. transformer good.

I'm not just going to spend 500 for new PCB board. I would like to know if anyone has a procedure for testing the relays K1-K3?

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When everything is connected, and your heater is not heating, is the heat indicator icon active on the topside control panel? Indicating to the user, that the tub should be heating? If it is not, then you have a sensor issue, because the circuit board is not sending power to the heater relays. And hence No Heat!
if the icon is active...
if so, then you are possibly correct in thinking that you could have bad heater relays on your circuitboard. It is A good possibility that they are bad, as it is a common situation that we see in the field. Unfortunately unless you are a circuit board rebuilder, or you know how to de-solder and re-solder, new relays, you have to purchase a new circuitboard. If you are up to some experimentation, and would like to do it yourself, this link may provide you an avenue to obtain such relays?
Spa Relays Ez Hot Tubs

if I was on site, this is what I would do...

  • Turn power off to the hot tub.
  • Disconnect the wires off of the heater element.
    • Or the two wires that go to the heater element, will be disconnected off of their related relay.
    • Reason... I want to isolate both lines.
  • I will not power up the spa, and create a demand for heat, or create a heat call.
  • Once I have confirmed, that the system itself is telling the user that is heating, by illuminating the heater on Icon, I will continue with my test.
  • I will now test each heater line to the "other" hot line connection. So that I will be reading, and looking for 240 V. 1 meter lead will be on a heater relay, and the other will be placed at TB 1, the terminal block where the power is coming into the spa.
  • This test will provide me the information of which really is bad.
  • Not that often that both relays, that provide the power to both heater terminals, will be bad.
If you find that only one really is bad, comment back on this thread, and I will continue to assist you.

Posted on Apr 14, 2015

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SOURCE: PUREX TRITON MINIMAX 400 Pool Heater Control Board

DId yo find the problem? My heater is doing the same thing.

Posted on Jul 28, 2009

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