Question about Jandy Laars Lt 400,000 Btu Heater

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The pool heater temp is set at 84 deg F, yet the pool water is at 78 deg F. What's wrong? Please send answer to: janapavlov @yahoo.com Thanks, Vlad

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  • jeff ross May 11, 2010

    keep in mind the heater is reading tempature of water at the heater. actual water temp in pool may be slightly different. as long as heater is functioning i would not worry about it

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What is the tem at the heater do you have a automatic control what is the temp here may need new temp sensor but dont have all info

Posted on Sep 13, 2009

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Posted on Jan 02, 2017

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2 Answers

Heater temp is 78 the water temp 68 how do I reset heater temp to match pool temp.


Sounds like a faulty temp sensor. Check it for debris, clean it good and see if that does it. If not try replacing it.

Jun 02, 2015 | Pool & Spa

1 Answer

Jandy LJ400 temp. indicator reads 97 temp set at 84 heater wont fire when i raise the temp to 100 it lights. what do i look at


Bob, sounds like it is working as designed. If the temp indicates 97, of course it won't fire if you set 84 as the temp (97) is already above that. When you set 100, it is higher than 97 and the unit attempts to raise the temp those 3 degrees. If you don't think the water is already at 97, then there is a calibration problem with the temp sensor.

Nov 26, 2014 | Jandy Pool & Spa

1 Answer

Jandy panel reads 89 degrees, sta rite heater panel reads the right temp 78.


Standard 10K ohm sensor appears to be compromised. Replace it.
You have one for water temp, one for air temp, and one for the solar if you have one.

Feb 14, 2014 | Jandy Pool & Spa

1 Answer

I have a pentair minimax nt and the heater works fine but it turns of automatically around 92 deg. Any ideas , is it the hi 115deg. or hi 150 deg sensor?


I would most likely suspect the temp sensor rather than a Hi-Limit switch. In other words the temp sensor is thinking the water is hotter than it is and sending the wrong signal. Actually it sends nothing, the resistance changes as the water gets hotter and the main control board turns the heater on and off based on this resistance reading.

Aug 31, 2011 | Pentair Minimax NT Heater

1 Answer

Our heater will not heat past 78 degrees. How do we get it to heat above that. Is there a factory set temp control problem? Thank you


Yes there is, but only a service technician is allowed to adjust it. However, the fact that you are only reaching 78 degrees makes me think something else is wrong.

Your bypass valve is probably the culprit. It is located where the Pipes enter the heater. It has a spring on it that is thermally activated to open and close. This allows the right amount of water to pass through the heater. Too much water and the water will not heat up. Too little water and the heater will vibrate and howl!

You could also have a faulty thermostat.

Also, always use a heater blanket when trying to heat a spa or pool. It will save you lots of money and time! And they are cheap!

Apr 16, 2011 | Pentair Minimax NT Heater

1 Answer

Have a brand new Master Temp 400K Propane with an Intellitouch and the heater shuts off at 84 degrees. Do I need to set a max temperature from the heater control panel?


If this heater has pool mode and spa mode as an option, and you need the water higher than 84 degrees, you must set it to spa mode even if it is a pool. As a regulation, these heaters come pre-set to max out at 84 degrees as a safety feature. However, in spa mode it can reach 104degrees.

Jan 11, 2011 | Pentair Mastertemp Heater

1 Answer

Have a 3.5 year old Jandy Aqualink RS 4 --- the air temp is reading correctly (78 F) but the pool temp is reading (201 F). What could this issue be? Pool sensor gone bad? If so, how do I repair or replace...


It is most likely not a bad reading on the on the display.

One culprit of a false temp reading could be:
If the temperature sensor is installed after the heater and the circulation pump is clogged or failing, this would allow super heated water to reach the temperature sensor and give you that reading. However, most pool/spa heaters have a high limit switch that would shut down the heater @ 150 degrees F. So this is also unlikely.

The most reasonable answer is to replace the temperature sensor.

If you refer to page 22 in this manual http://www.jandy-downloads.com/pdfs/Allbutton_manual.pdf
you will see that the temperature sensor is installed on terminals 5 and 6.
Trace these wires. They will goto a thermowell (which holds the temperature sensor) either in the pool plumbing, or to a temperature sensor in the heater itself. Temperature sensors when in the heater are located typically above the inlet/outlet header. There will be some disassembling required to access it in this case.
If it is in the heater and you need more help, e-mail me @ adamh@newconceptchem.com

Please take the time to give me a positive rating on this post if I have helped.

Thanks
adam

Nov 02, 2010 | Jandy Pool & Spa

1 Answer

Ref: Sta-Rite Max-E 400. Pool temp is about 75


Your temp sensor has gone bad and will need to be replaced. It's a small tube that slides into the water manifold and you can follow the wires back to the board. Just unplug and set a new one in place.

May 12, 2010 | Sta Rite Sta-Rite Max-E-Therm High...

1 Answer

Pool Not Heating Display Wrong


where the thermostat is located, the pump is not circulating the water

Sep 04, 2009 | Raypak Free Hydraulic Lift Gate Delivery -...

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