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Sacha Shaughnessy Posted on Jan 31, 2014
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Hydropool hot tub

My heater on my hot tub will not run on low speed.

1 Answer

Bill Jordan

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  • Expert 375 Answers
  • Posted on Feb 02, 2014
Bill Jordan
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Joined: Dec 19, 2012
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Check your filter. It may be clogged. This will restrict flow and prevent the pressure/flow switch from actuating. The heater will think that water is not flowing and not allow the burner to produce heat.

  • Mark Winwood
    Mark Winwood Jun 30, 2017

    Genius Bill. Thank you. It was the filter. I'd just put a new one in (from a new source) a few days before but hadn't checked to see if all was well...obviously it wasn't. On your suggestion I put one of the old ones back in and it started immediately.

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5 Related Answers

Ian  Hot Tub

hot tub plus

  • 77 Answers
  • Posted on Apr 17, 2010

SOURCE: Intermittent jet problem on Spa form hot tub

Hmm, that's an odd one. It could be either a fault with the PCB or the pump.

The first thing to check is the voltage to the twin speed pump. If that's ok the motor is probably the cause of the fault.

As always, with anything electrical you need to be very careful with what you're doing and if you're unsure seek professional help.

Regards,
Ian.
http://hottub.synthasite.com

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Anonymous

  • 990 Answers
  • Posted on Oct 31, 2009

SOURCE: Motor is hooked up correctly according to

You have 220v running into your motor, the red and the plack are in most cases the same 110v line and what your calling a white netural is a common line. In other words the second half of your 220v line. If your red and black are the two opposing 110v lines that make up your 220v and they are put on the motor and turned on they short aginst each other and blow the breaker. One of your 220v lines should come into your hi -low switch and then split to your high and low on the pump. The other half of your 220v line will go to the common or what your calling nuteral. The difference is a netural completes a 110v circut and a common completes the 220v circut it will take to run the motor. One of the splits will complete the low speed circut and the other will complete the high speed circut. You need to check your voltage comming into the spa, the way the spa is wired (110v-220v), and how the motor is wired (110v-220v). For your spa this will be in your owners manuel or on a scematic inside a panel or door and is quite often a plug you change from one spot to another. On your motor will have a scematic on the back of the motor that will tell you haw to adjust the wireing already in place on the wire board of the motor. This may sound deep but if all your voltages are set the same and your high and low are the same leg of power, this should fix your problem.

Ian  Hot Tub

hot tub plus

  • 77 Answers
  • Posted on Jul 06, 2010

SOURCE: why does the ice bucket not drain into the hot tub!

Ice buckets don't normally drain into the hot tub water. They should drain externally. The drain pipe will go through the cabinet and exit the bottom close to the floor.... or at least that's how all the ice buckets I've encountered drain.

Regards,
Ian.
http://hottub.synthasite.com

Anonymous

  • 417 Answers
  • Posted on Feb 22, 2011

SOURCE: hello,I have an old jacuzzi

hi,

ok so when the pump is on high and the heater is running it doesent trip? you didnt say if it did. undo the heater leads so the pump is isolated completely. run the pump on the control centers gfci and see if it trips. if it does then try wiring directly - with an extension cord to a plug with a gfci in your house and see if it trips the gfci in your bathroom. if no trip inside house then bypass tubs gfci and run it with heater and pump through your bathroom gfci. if no trip then try and replace the tubs gfci, it gets pretty humid in the control center and gfci's have a semiconductor which which do fail after years of rough duty like that. if it trips the gfci in your house with the heater again it has a cracked heater element. craigslist always has old hot tubs and parts. you might have to buy a whole used old hot tub but that may be cheaper than a new heater box.

later

jm

MOTORWIZJ

Jay Finke

  • 1397 Answers
  • Posted on Sep 11, 2012

SOURCE: 3 hp hot tub motor Sta-Rite tub has two speed low for filtering and high for jets low starts and then stops high speed works fine

make sure you make a wiring diagram or just unplug the plug from the mother board and search your area for your local pool pump repair guy with free testing. these are a high $$$ motor and not a good one to practice on, save it for a pro ! it might just be a dirty switch or need to be reset I don't charge any thing for that, and while your there ask him how to take better care of your $$$ pump ?
jay the pool pump repair guy longwood Florida

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Hello,I have an old jacuzzi vectra II hot tub (1988) 120 volt.the gfci on the unit trips every time the pump is on low speed with the thermostat calling for heat. there is no trip when there is no demand...

hi,

ok so when the pump is on high and the heater is running it doesent trip? you didnt say if it did. undo the heater leads so the pump is isolated completely. run the pump on the control centers gfci and see if it trips. if it does then try wiring directly - with an extension cord to a plug with a gfci in your house and see if it trips the gfci in your bathroom. if no trip inside house then bypass tubs gfci and run it with heater and pump through your bathroom gfci. if no trip then try and replace the tubs gfci, it gets pretty humid in the control center and gfci's have a semiconductor which which do fail after years of rough duty like that. if it trips the gfci in your house with the heater again it has a cracked heater element. craigslist always has old hot tubs and parts. you might have to buy a whole used old hot tub but that may be cheaper than a new heater box.

later

jm
0helpful
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I have a 2004 great lakes hot tub with a balboa controler. My hot tub heats up fine when the pump runs on high but the temp light never comes on when the pump runs in low.

check to see that the flow switch is working properly, it may not have enough flow on low speed to allow the heater to turn on. Make sure your filter/s is/are clean. If you have a pressure switch instead of a flow switch, it may need to be adjusted or replaced.
1helpful
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We bought a house with a hot tub and do not have the instructions to it. We have a Manatee Electric spa heater made by Tropic Air Products, Inc manuf. 4/1997 model E-11 11 KW AMPS. We would love some...

I just looked at the exploded drawing for the Manatee. It looks like a very simple heater. The heater will simply come on whenever the pump is running and the thermostat says that the tub is not hot enough. So, for the heater, set it and forget it.

The adjustment you can make is by setting the low-speed pump timer. There should be a timer on the control box, somewhere. Generally, you set the timer to come on for a couple of hours, twice a day. During those times, the pump will come on low-speed and the heater will come on as needed.
Keep in mind that the tub will only heat when the pump is running so you will want to set the timer so that the tub has been running for at least an hour when you will be ready to use it.

Most controls will also allow you to put the pump on thermostat control, usually with a switch (timer/ t-stat). By running on t-stat control, the low-speed pump and heater will turn on whenever the temperature drops a couple of degrees.

Timer control is usually more efficient for two reasons:
1. The tub doesn't heat water when you don't need it (like while you are sleeping or at work).
2. The pump isn't cycling on and off all day and night. Cycling is not very efficient.

Tip: If you want to soak when the tub isn't hot, just turn the pump on for 10 minutes or so before you get in. That is a pretty big heater, and unless you have very poor insulation or a worn-out cover, the temp shouldn't drop too fast.

Another tip: The best way to save money on a tub is to maintain your pH. Check it EVERY WEEK! Incorrect pH will shorten the life of your heater and seals. One service call would have paid for a lot of electricity.

Please feel free to post follow-up questions.

1helpful
1answer

Pump is running ever 5 minutes. The heat in the

Sounds as if the 'mode' for the tub is set to sense the temperature of the water. see if there is a setting on the control box to a 'timed' setting for filtering and heating instead of controlled by the temperature setting. the problem is the the control box is away from the water and when it calls for heat it is because the water is cooler there than in the hot tub. so when it calls for heat and the water starts to circulate it gets the hot water from the body of the hot tub and then shut down because it senses the 'hot water'. make sense?
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