Troubleshooting a Jandy LXi heater

[Marc-Y]

Hello All,

I'm new to pools and this is my first post!

I'm an engineer so I am reasonably handy.

My new home came with a Jandy LXi gas heater model LXI400N manufactured in 2014. The display says the water temperature is 114 degrees when the water is 80 degrees.

The obvious problem is a faulty thermistor. But I tested it and it reads 9.31K Ohms, so the problem is not the thermistor. My only other thought is a faulty controller board.

That part is expensive, so I wanted to know if anyone has any suggestions before I go out and replace it.

Also, it looks like there is a second generation board out there, and my unit has a first generation board (the chip on the board says 4.3). Is there any problem putting a second generation board in my heater?

Thanks!

 

[ajw22]

Welcome to TFP.

@ps0303 @Pool Clown @swamprat69 @setsailsoon thoughts?

 

[Cdiaz11]

Hello All,

I'm new to pools and this is my first post!

I'm an engineer so I am reasonably handy.

My new home came with a Jandy LXi gas heater model LXI400N manufactured in 2014. The display says the water temperature is 114 degrees when the water is 80 degrees.

The obvious problem is a faulty thermistor. But I tested it and it reads 9.31K Ohms, so the problem is not the thermistor. My only other thought is a faulty controller board.

That part is expensive, so I wanted to know if anyone has any suggestions before I go out and replace it.

Also, it looks like there is a second generation board out there, and my unit has a first generation board (the chip on the board says 4.3). Is there any problem putting a second generation board in my heater?

Thanks!

I’m having the same issue. Let me know if you find a solution. I replaced my high and low limit sensors and reset sensor switch and some brass nuds now I got my heater blower to turn on for 15 seconds then it turns off but still stated temp sensor service light I know my problem is with either a bad connection or maybe I need a new board but yes it’s expensive and original board is discontinued. Also in your case there are other 2 temp sensor one reads the air and the other one goes into a pipe and reads the pool temp Maybe that one is telling your system the pool temp is hot when in fact it’s not. I’m also going to test my theory.

 

[Pool Clown]

Jandy PC Board Repair

 

[Cdiaz11]

Yes I tried them and they repaired my Jandy heater board. Problem solved and they also saved me some money... fast and reliant. Thank you...