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Thread: Heater does not shut off normally - runs to OH

  1. Back To Top    #1

    Join Date
    Mar 2012
    Location
    Marietta, GA
    Posts
    10

    Heater does not shut off normally - runs to OH

    Equipment: Dynasty Spa 6-person Classic series; 2-speed 240v main pump, 1-speed 240v pump 2, 120v ozone, 5.5 kW heater, duplex panel (VS402), controlled by a new (2013 replacement board) Balboa VS501. SSID: 100 63 43 All 10 dip switches OFF.

    Hi. I received a used spa as part of a house I bought. The previous owners had just replaced the control board. My only other spa experience had been an inground attached to a pool, so this style of control is all new to me. I have spent numerous hours to get through most of the learning curve to obtain the correct reference materials but I'm still stuck.

    When a heating cycle begins, the heater will start correctly but will not turn off normally. Here are the two cases so far:

    1) Standard mode. Turn breaker on to start power. Spa starts: priming, then filtration cycle. All fine. Set temp to 101. Heater starts. Close cover of spa. Come back in an hour or so, pump still running, temp shows 103. Set temp is still 101. Heater still on. Hmmm. Come back in another hour, temp shows 107. Set temp still 101. Heater still on. Come back in 30 mins, OH condition on panel, pump off. heater off. Temp 110.

    2) Economy mode. Tried this yesterday starting with water temp equal to the set temp of 101. 2 hour filtration cycle set. Filtration cycle kicks in. Close spa cover. Apparently heater starts. 2 hrs later, filtration cycle ends, spa temp 105, set temp 101. So I figure that the only thing stopping this from reaching OH is that the filtration cycle ended and since it was in EC mode, it was the EC programming shut off the heater/pump not the runaway heater (OH).

    Have gone into test mode, and both M7 sensors were matching each other and the water temp. Also have removed the cartridge filter wondering if flow had anything to do with it. No change.

    Next was going to try plugging / unplugging sensors 5-6 times (with power off, naturally) to see if it's a contact kind of issue. But doubt it.

    Doesn't the thermostat control come thru the M7 sensors?

    Any ideas?

  2. Back To Top    #2

    Join Date
    Mar 2012
    Location
    Marietta, GA
    Posts
    10

    Re: Heater does not shut off normally - runs to OH

    Problem resolved -- turns out that when the replacement board was installed, the 2-speed motor was wired backwards with hi-speed and low-speed reversed. This caused the high-speed to run whenever the low-speed was supposed to be on, and this caused the water to continue to heat even *without* the heater being on because the high-speed mode heats the water as the pump gets so hot on high-speed.

    Thanks to Tom at spadepot.com for figuring this out for me! LOL. As it turned out, the next day I found the original owners documentation. There was an insert page warning the user not to run the high-speed excessively as this would heat the water!

    As instructed, I simply switched the wire spades on the 2-speed main pump itself and everything has settled nicely.
    6-person Dynasty Spa Recreation series, 2-speed main pump (240v), 1-speed pump2(240v); ozonator
    36x15 vinyl in-ground pool (26000 gals) with diving board and water slide; Pentair Tagelus 60D sand filter, PentairIntellichlor IC40 chlorine generator, Pentair 250k btu natural gas heater

  3. Back To Top    #3
    Smykowski's Avatar
    Join Date
    Sep 2011
    Location
    Gurnee, IL (North Suburban Chi-town)
    Posts
    3,065

    Re: Heater does not shut off normally - runs to OH

    Sorry you didn't get any answers from us, but I'm glad you got it solved, and thank you for posting a follow up to help others in the future.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

  4. Back To Top    #4

    Join Date
    Mar 2012
    Location
    Marietta, GA
    Posts
    10

    Re: Heater does not shut off normally - runs to OH

    Nonsense! I have garnered way more knowledge from this excellent site than I can ever repay. Thanks again!

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