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My hot tub is not heating up is their a relay that turns the heater on or could the heater be defective the controller seams to be working

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You could have a bad heating element, a bad heater fuse or a bad pressure switch.

Make sure you have water flowing (pump working and not clogged)

Check pressure switch for contenuity

Check for error codes.

Posted on Oct 28, 2010

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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.

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.

Apr 06, 2015 | Pool & Spa

1 Answer

95 hot springs soverigon hot tub

It sounds to me like the heater coil is shorting out intermittently. When it does, it draws too much current and burns the wire. Replace the coil.

Jan 26, 2014 | Dryers

1 Answer

I have a Jacuzzi J340 Hot Tub. I am having trouble with the heating. When the pump is on, the water circulates just fine. once the heater kicks on, it runs for about 10 seconds, then clicks to OH, and...

make sure the heating element isnt touching the casing inside the heating tube. if its an indoor tub, make sure the filtration cycles are not set to constant. constant filter cycles on an indoor tub will generate residual heat from the circ pump running 24/7, causing tub to heat past 104 degrees

Sep 15, 2013 | Jacuzzi Pool & Spa

3 Answers

Spa thermal overheating

Turn off all power to the hot tub as soon as you realize it is overheating. The spa should have an automatic shut off when the water temperature reaches about 112 degrees fahrenheit. Call your hot tub dealer or manufacturer for service options. There are a variety of conditions that could lead to the overheating of your hot tub, but may differ in various hot tub models and brands. Check the water level of the hot tub. Low water levels could be the culprit for the over heating, so you may just need to add more water to the hot tub.
Check the shut-off valves in the hot tub. If they are closed while the hot tub heater is on, it could cause the water to reach unsafe temperatures.
Clean the hot tub filter. A dirty filter could be blocking the flow of water, causing the water to sit in the hot tub and overheat.
Turn the power back on after finding the problem and talking to the hot tub dealer. The hot tub will probably not start back up until the water reaches a safe temperature

Jan 06, 2012 | Endless Summer Pool & Spa

1 Answer

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...


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.



Feb 22, 2011 | Jacuzzi MAGNUM FORCE POOL PUMP - TWO SPEED...

1 Answer

I have a 2000 Sovereign Hot Spring hot tub that quite heating, I checked filters they are ok, I have no air lock, The jets and light work fine. Inside the control box on the circuit board all 3 led lights...

Check for a bad heater controller board or burnt wire connection going to the heater. You can check for voltage across the white and black leads going to the heater from the heater controller board (upper left corner of the black control box

Mar 31, 2010 | Waterway 5 Hp 230 Volt 2 Speed Side...

1 Answer

QCA Opal hot tub display reading OH.

The tub experienced an overheat situation. This may be due to leaving the t stat turned all the way up and not monitoring or the hi-limit sensor is defective. The hi-limit sensor will shut down the heating cicuit if temp gets above 105 D optimally.the fact that the heater light is on is a good sign that things are working at this point.Whether or not a suitable temp(100-103 D) will be arrived at is to be seen. If spa heat kicks off before set temp is reached then replace hi-limit sensor.

Apr 10, 2009 | Qca Spas Jewel Series Topaz Plus Hot Tub

1 Answer

Jaccuzi hot tub will not heat?

sounds like it maybe the heater again. Have you pulled it out and checked the ohms? it should be at least 10.5 ohms
it could be the thermostat or the pressure switch - if either of those are not working it will not heat either.

Dec 28, 2008 | Home

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