milstep Posted September 18, 2021 Report Share Posted September 18, 2021 (edited) hello i have a hot spring hot tub Vanguard rv. 2008. the whirlpool, after being disconnected from the mains, will not start after reconnection. only occasionally the blue backlight of the main control panel flashes. red and green LEDs On the main circuit board ... off. please, give me an advice. what can be the problem and how to solve it. thank you for answer Edited September 19, 2021 by milstep change language Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted September 19, 2021 Report Share Posted September 19, 2021 Check incoming voltage and test thermistors (sensors in heater, plugs at lim therm and reg therm) with an ohm meter. Post results. Quote Link to comment Share on other sites More sharing options...
milstep Posted September 19, 2021 Author Report Share Posted September 19, 2021 but I'll do it tomorrow. I also found out that a smaller board is soldered on the main board which supplies the main board. the input to this board is 220v and the outputs are 5V, 9V, 12V and 20V. when I measured the outputs with a voltmeter, I did not measure any of the required values there, not even remotely. you small plates sound ... after about three to five seconds such a click. I think the power supply of the main printed circuit board is bad Quote Link to comment Share on other sites More sharing options...
milstep Posted September 19, 2021 Author Report Share Posted September 19, 2021 Vstupní napětí 230V. A děkuji moc za vaši odpověď a pomoc při řešení mého problému. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted September 19, 2021 Report Share Posted September 19, 2021 That is a fairly common issue, but I test everything else before replacing the board. If you are sure about your test, then get a board. Quote Link to comment Share on other sites More sharing options...
milstep Posted September 19, 2021 Author Report Share Posted September 19, 2021 I assume that a faulty water heater would block the start of the whirlpool. but the LED display below the display and these basic functions would be in operation. And it would not affect the voltage and voltage output of the main circuit board. it should measure the required voltage values. and probably some LED on the Main PCB would light up. so if you agree with me if there is no required voltage at the output of the board power supply, the problem is powered in it. do you agree with me? is my reasoning correct? thank you for answer. song unfamiliar in this matter Quote Link to comment Share on other sites More sharing options...
milstep Posted September 19, 2021 Author Report Share Posted September 19, 2021 Omlouvám se za příšernou angličtinu ... Google překladač Quote Link to comment Share on other sites More sharing options...
milstep Posted September 19, 2021 Author Report Share Posted September 19, 2021 is there any way to fix the motherboard power supply? Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted September 20, 2021 Report Share Posted September 20, 2021 8 hours ago, milstep said: assume that a faulty water heater would block the start of the whirlpool. No. It could trip the breaker or simply not heat, but it will not stop the jets from working or cause lights to flash on the display. 8 hours ago, milstep said: And it would not affect the voltage and voltage output of the main circuit board. it should measure the required voltage values. Correct. 8 hours ago, milstep said: and probably some LED on the Main PCB would light up. Maybe. The "lim ok" light is sensor related, the "htr on" is only on if the spa is turning on the heater (which it won't do if the sensor is bad), and the "control unplugged" is only on if the control is unplugged. So unplug the control panel and turn it on. If the 3rd led is not on, it's a board power issue. 9 hours ago, milstep said: is my reasoning correct? Again, as long as you are sure of those results and you didn't accidentally check the wrong spot. 8 hours ago, milstep said: is there any way to fix the motherboard power supply? Not that I know of. I am no electronics repair man, but I know those boards, even the small transformer board, are proprietary, and only available through Watkins manufacturing (who makes hot springs spas, among others). Quote Link to comment Share on other sites More sharing options...
milstep Posted September 20, 2021 Author Report Share Posted September 20, 2021 Good day. Thank you very much for your support with my problem. And I really appreciate it. I will try to send you a Link to one UK page with spare parts. ( https://spacomponents.co.uk/hotspring-boards/2693-hotspring-iq2000-pcb.html ) it describes how it is known that the power board of the main system board is leaving. exactly the same {I mean the sound} I observe on my power board. the board has the described procedure 220V and outputs 5 volts 9V 12V 20v. I will measure 230v correctly at the input, but I will not measure practically anything at the outputs. with the period of that sound, the voltage at the outputs also changes. no burnout, damage, or burns are yet visible on the power board. only the required electrical voltage does not come out of it Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted September 21, 2021 Report Share Posted September 21, 2021 Sounds like the transformer board to me. Watkins makes a few that look alike but are not compatible. Check the model number to verify. Quote Link to comment Share on other sites More sharing options...
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