Jandy LXi - Fault High Limit

[Easto]

Opened the pool today.
Went to fire up the heater and had a fault.
found the limit sensor to be heavily corroded

I ordered a new harness of Amazon.ca

I am 90% sure where the harness plugs in on the heater. Can someone confirm this is the right spot?

And do I have to run the cable behind all these components or can I run it in front?

 

[ajw22]

@ps0303 @Pool Clown

 

[Easto]

One last question while I wait 10 day’s for my Amazon delivery.

When I replace the sensors does it matter which one goes in the left and which one right?

 

[Pool Clown]

YES! Replace them one at a time. One should have 130 on it, and the other 150.

The heater cant tell where the wires are run. Although i would want them protected somewhat.

 

[Easto]

@Pool Clown
Looking straight at the heater, the one on the right came out no problem. It had some white powder on it.

The left was heavily corroded the wires were pulled out while I was trying to remove it and eventually the metal ring at the bottom came out in two pieces.

when they go back in which one goes back into the left 130 or 150?

And the picture i posted, that the correct wire on the panel?

without taking that panel off I don’t know how I’d be able to snake the wire back through there

with the whole new harness, I’m not too sure how I’d replace them one at a time?

 

[Pool Clown]

When i said replace them one at a time, i meant so you wouldn't get them mixed up. The 150 (may have a red mark on it) goes in the lower well.

 

[Deltamark]

When i said replace them one at a time, i meant so you wouldn't get them mixed up. The 150 (may have a red mark on it) goes in the lower well.

the packaging will also have a slip of paper inside that says.... red dot goe into lower well.

 

[Easto]

@Pool Clown Just wanted to say thanks for the help!

 

[Pool Clown]

 

[Easto]

@Pool Clown can you confirm in picture 1 that’s where it plugs into the board?
The part is supposed to Arrive today

 

[setsailsoon]

I am 90% sure where the harness plugs in on the heater. Can someone confirm this is the right spot?

Yes, the high and low temp sensors are in series and plug into J17. Below is a handy little picture for future reference.

Chris

 

[Easto]

Beauty, thanks

 

[Easto]

Replaced the part

verysimple

heater went on right away

thanks for the help

 

[Easto]

@Pool Clown

I got the same error again today when I turned my pool on this morning.

I took the limit sensors out and they look fine.

I just replaced them this season, any idea what’s going on?

This is really frustrating.

 

[setsailsoon]

I've found connections to sensors can be very frustrating to resolve. Wiggle the connections on both ends to see if this makes it work during the start cycle. I found one connection that looked perfectly OK but definitely caused "fail-no fail" faults with slight movement. Looked fine but I cleaned and reinstalled then coated with corrosion block. I did this for all the sensor connections and none of them have failed since (about 4 years).

I hope this helps.

Chris

 

[Easto]

The connections looks tight. I took the rubber sleeve off and looked at the connection and pushed the sensor down as far is it would go.

with my limited experience it looks like it should work.

very very little amount of white powder suck on the end of the one without the red dot. Tried to brush it all off, some is stuck on. Not sure how to get it all off without damaging it.

I also don’t want to spray anything on it that may damage it.

Other than my water getting up to 90 degrees yesterday (we were away for 2 days with the solar blanket on) I don’t know what else could have caused it

 

[Pool Clown]

All i can offer is to check the wiring to make sure a tenant has not moved in and started to eat the wiring, OR...
You may be beginning to have board issues. This guy can probably test the board for you and /or repair if needed.

 

[Rossterman]

Also check the hi limit sensor/circuit breaker inside the cabinet above The manifold. Mine was doing the same thing and it turned out this part (which can be reset with the button on the face was corroded as well. throws the same trouble code.

 

[setsailsoon]

All i can offer is to check the wiring to make sure a tenant has not moved in and started to eat the wiring, OR...
You may be beginning to have board issues. This guy can probably test the board for you and /or repair if needed.

I can vouch for this guy. Very responsive when I spoke with him. He'll tell you on the phone if he can repair it and committed to 2 day turnaround. I believe the flat rate about a year ago was $150.

Chris

 

[setsailsoon]

When you turn the heater on do you get a momentary red blip on the LED located on the side of the FenwaI? Do you get 1, 2, or 3 blips after it shuts down?

If you haven't already done this, temporarily short each limit switch in the white circuit. If you still have the issue the failure is somewhere else in the loop. Try the other sensor loops. If this doesn't work call Bob P. above explain the problem and see if he thinks he can help. He's a very nice guy and easy to talk to plus I believe he designed the boards originally.

Chris