My hot tub won't heat up (SOLVED)

[kangjwsua]

I moved in a house with hot tub six months a go.
When I tried to use hot tub, it is power on but won't heat up.

The model is LA Spas S series (H82113-2006). 240V 4K watt.

these are what I have already tried:
there was a three dots error signal (flow error)
-cleaned filter
-replaced pressure switch (it was leaking and no conductivity and no power on heating element terminals)
-replaced heating element (because it's resistance was too low)
-replaced temp sensor and hi-limit sensor.
now with some adjustment of pressure switch, both heating element terminals has 240V power and enough current (17A).

i turned it on a whole day. it is still not even warm at all.
finally i called technician, he said the spa is mechanically OK, and configed the control panel.
-made sure the economy mode is disabled.
-the panel displayed the current temp is 32 F (he said the sensor shows only higher than 58F)
-the technician said it will take a day to heat up completely and I paid $99 yesterday

But today, it still cold.......
The panel shows only current temp 32 F. no flow icon. nothing operating.
No flow error sign either.
At this time no power on the terminal.

If i turn off and turn it on, the power goes to the heating element again.
What may cause to stop heating even though the temp is much colder than desired temp?
That is my final question.

Thanks for reading.

 

[Bama Rambler]

Re: My hot tub won't heat up

Welcome to TFP.

Do you have a schematic of the wiring?

My guess would be a high limit taking it out.

How long have you sat and made sure the heater had power?

 

[kangjwsua]

Re: My hot tub won't heat up

I updated my post adding a schematic.
I was looking at the hot tub maybe 30 minute and left.
so I am not sure how long the power goes to the the terminals.

 

[Bama Rambler]

Re: My hot tub won't heat up

I can't see the schematic clearly but I still suspect a high limit.

 

[kangjwsua]

Re: My hot tub won't heat up

I uploaded a better photo.

 

[Bama Rambler]

Re: My hot tub won't heat up

Much better.

There's a high limit probe but there's no information on the sheet for it. Is there any info about it in the manual?

 

[kangjwsua]

Re: My hot tub won't heat up

I found a right manual (it's size too big to post) but i can't find any detail info about high limit sensor.

 

[Bama Rambler]

Re: My hot tub won't heat up

Do you have a link to it or is it printed?

 

[kangjwsua]

Re: My hot tub won't heat up

i uploaded the manual file to a webhard.
this is the link you can view and download.
http://me2.do/GU57e2zQ
(manu button is not in English but it will work).

 

[Bama Rambler]

Re: My hot tub won't heat up

Well it didn't tell anything about the high temp probe did it.

Can you tell what it physically looks like?
Does it look like the temp probe?

 

[kangjwsua]

Re: My hot tub won't heat up

Yes. same shape and smaller size.
http://www.spadepot.com/shop/Hi-LimitTe ... 0C704.aspx

My heater seems work only the filtration period.
default setting is 60 minutes twice per day.
It may enough to maintain hot water but not enough to heat up cold water up to 104 degree.

Now i feel the water is little bit warm, so i tried to change the filtration setting; 240 minutes twice per day.
And 4 hours later i will check the water temperature and do it again.

let's see.

 

[Bama Rambler]

Re: My hot tub won't heat up

If that doesn't work, you may try swapping the temp sensor and hi limit wires and see what happens.

 

[thekidbrad]

Re: My hot tub won't heat up

Flow errors often have to do with the pump itself. Have you checked to make sure there is proper flow coming out of the jets?

 

[kangjwsua]

Re: My hot tub won't heat up

I think my hot tub is hot now.
Thank Bama Rambler for the idea about temperature issue.
The problem was temperature probe.
When I unplugged the High-limit probe, it causes a three dots and red light error signal. so i put it back.
When I unplugged the Temp probe, nothing changes on the topside panel. Still 32 degree. Ah-Hah!!!!!
The new temp probe is not working!

I tried to use my old temp probe, suddenly the temperature went 62 degree. The old temp sensor still works.
The old probe has three wires (Green, Black, Red) and new one has only two wires (red and black).

Anyway, my hot tub is finally hot enough. No more COLD TUB!

Thanks everybody.

 

[Bama Rambler]

Glad you got it figured out.