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EUS PE 52A-102B-5 is my spa heat pump (about 15 years old but has been running perfectly .... it gets minimal use; half a dozen times per month Winter only). Because I go north in the spring and return in the Fall, I turn the unit's circuit breaker in the house distribution box to "Off". When I now power on the pump runs for about ten seconds and then shuts down. It continues to do this about every five minutes (when compressor pressure drops down). I had the same problem last year, but I took a small hammer and taped on the inner components (valves, etc.) and then it began working as it should for the entire winter season. Last week after returning from up north, when I turned it on it began doing the cycle on / cycle off again. Howerver, after doing it a half dozen times, it seem to have cured itself and ran continuously for over an hour so I shut down figuring its all set now. Yesterday when I turned it on, its doing the cycle on for ten seconds, off for about five minutes, etc. Tried tapping on the same internal components to no avail. A little help please? Bob Desrosiers

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  • rtd1576 Nov 06, 2010

    I'd like to send you the schematic in .pdf image of the circuitry/components so you can better help me. I did clean the two large contacts of the main relay (easily accessable by simply removing a cover) by sanding contacts with double sided sandpaper. That did not cure. There is a Start Relay (SR) that connects between the Line, Start Capacitor and the negative side of the Run Capacitor (also positive side of the Run Capacitor connects to the other terminal of the Start Capacitor).



    Thanks, Bob Desrosiers


  • rtd1576 Nov 07, 2010

    I would like to send you the electrical / component schematic (pdf file) so you can better assist as I think I followed your initial advise, but without success. How can I send you the pdf file?
    Bob Desrosiers

  • rtd1576 Nov 09, 2010

    Azraelsrl, a little clarification please? The water circulation system (from spa to heat pump and return is driven by a separate water pump located several feet away from the heat pump system. The water circulation pump is new and there is plenty of water pressure as the water jets in the spa have a strong force as normal. The heat pump is a separate and closed system (like a window air conditioner) existing of a compressor, condenser, evaparator and fan/motor. The heat pump system is designed to run only when the the water circulation system is running. So, there is some type of mechanical/electrical sensor between the heat pump system and the water circulation system that might be the culpret. When you say there is lime buildup in the pump, what pump do you mean? Bob Desrosiers

  • rtd1576 Nov 09, 2010

    Duane, no web link. I simply scanned the document into a pdf formatted file which I can send as an attachment in an email. Bob D. .

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This isn't an electrical problem, it's purely mechanical: in time lime deposits had build up inside the pump and they have messed up the functioning of your pump. This is what is happening: the valves are pretty much blocked by lime; when the pump starts the pressure inside it goes to dangerous levels so the safety valve is engaged and cuts the power and because there is some flow the pressure drops rapidly to normal levels; unfortunately the safety valve is also covered in lime so it gets pretty much stuck in the closed position. In the past tapping has been enough to loosen the deposits and return it to normal functioning, not anymore - now you need to wait until the pressure valve slides down on its own.
The only way to fix that is to dismantle the pump completely and manually remove all the deposits of lime. It's a long and difficult job, if you're not in the prime of your life you better just get a new system.

Posted on Nov 07, 2010

  • Azrael SRL Nov 07, 2010

    You need to find out a site that offers the locker functionality - you can upload a file and other people can download it - a site like
    http://www.mediafire.com/
    But as i said in your system there is no temporizer that could malfunction in a way to create the behaviour you describe so the electrical schematic is useless here - this is a mechanical fault

  • Azrael SRL Nov 09, 2010

    I supposed from the start that this is a water circulation problem, not a heat generation one. If it is indeed a water circulation problem then the lime has deposited most likely in the pump or the heat exchanger: it creates pressure on the lines that shut down the water pump. The first thing you should check is the water pump - make sure it's clean and, when plugged directly in the mains , is fully operational.
    If this is a heat generation problem (the compressor of the heater is the one that stops) then the first thing you should check is the water flow sensor (located at the input of the heat exchanger).

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Sounds like the circuit breaker inside needs to be changed with a new one.
Tapping may have in the past freed up the corrosion on the contacts of the circuit breaker.
But, a new one is indicated if it keeps giving you problems.

If parts are unavailable, then try to replace the circuit breaker with a new one that can be manually reset like a house circuit breaker, rather than a time delayed one that resets itself.

May have a short somewhere if it continues to do this.

Good luck on this repair.

Posted on Nov 06, 2010

  • Duane Wong
    Duane Wong Nov 07, 2010

    Do you have a web link to the .pdf file so that it can be downloaded?

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