Help with Jandy JXI Heater High Water Temp Fault

Teduardo02

Gold Supporter
Aug 3, 2020
4
Montgomery County PA
My Jandy JXI gas heater wont fire up because it thinks the water temperature is too high. I ordered a replacement water temp sensor online and just replaced it but it still thinks the temp is 142 F. I tested the new sensor with a multimeter checking the ohms and it reads properly. Where should I go from here? Thanks to everyone in advance.
 

Teduardo02

Gold Supporter
Aug 3, 2020
4
Montgomery County PA
Pics of the equipment? Sounds like heat is backing up in the intake side of the manifold. Does the heater have a versa flow? And the 1.5 Pentair pump is single speed?
Here are some pics. I think its a single speed pump and not sure about the versa flow. Sorry I just bought the house and still trying to getting to know how everything works. Thanks
 

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ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
37,917
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
I wonder if the 10k resistor test would work on the jxi. Let’s ask Allen @ajw22

It would but he said he tested the thermistor with a multimeter and it had the expected reading.

There is a thermal regulator and bypass valve in the header that I would check. See page 12 in Workbook JXi Pool&Spa Heater that is a training manual for pool repairmen.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
37,917
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
I actually said the same thing before I edited it above. The heater never initially fired so his reading 147. The resistor test would rule out board/thermistor.

I thought the heater ran like you did.

Connecting a 10K resistor in place of the thermistor will determine if it is the problem is in the wireing or board which it sounds like it is...

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