High Limit 2 Error

[atxjmy512]

Hi all -

I have a Raypak 406A Heater. Lately I've been getting a High Limit 2 error. I'm not sure what this is or what could cause it beyond one of the thermometers is getting too hot. What could cause this and is there any way for me to check it myself? I'm fairly handy but heaters are a bit out of my comfort zone.

 

[ajw22]

People have put insulation around the sensors. Read RayPak Heaters - Further Reading

 

[atxjmy512]

People have put insulation around the sensors. Read RayPak Heaters - Further Reading

In that picture - the sensor is metal bar with material wrapped around it? I haven’t actually opened it up. What’s the anatomy of the picture (if you know)?

 

[ajw22]

In that picture - the sensor is metal bar with material wrapped around it? I haven’t actually opened it up. What’s the anatomy of the picture (if you know)?

New Raypak LP heater issue. high limit fault

Just installed my new heater. It keeps tripping the high limit 2 switch. I think it’s a 135 degree trip. I put a thermocouple on that switch and noticed that if the side cover is off, it runs 120 - 128 degrees. If I put the cover back on it runs 127 - 137 degrees and trips. Why would it run...

www.troublefreepool.com

There are two HLS sensors with orange caps and two wires into each…

 

[atxjmy512]

New Raypak LP heater issue. high limit fault

Just installed my new heater. It keeps tripping the high limit 2 switch. I think it’s a 135 degree trip. I put a thermocouple on that switch and noticed that if the side cover is off, it runs 120 - 128 degrees. If I put the cover back on it runs 127 - 137 degrees and trips. Why would it run...

www.troublefreepool.com

There are two HLS sensors with orange caps and two wires into each…

This is perfect thanks.

 

[atxjmy512]

They call out adding thermal paste the the sensors as part of the fix. Do you think it matters what kind?

@JamesR - what kind did you use on your raypak fix last year? Also where did you get your header insulation?

 

[JamesR]

The insulation is automotive header wrap. I only used that because I had some left over from my Chevelle. I think basic fiberglass insulation packed in there would be as effective.
The thermal paste, I used CPU heat sink compound. You don’t need much at all.
It ran the remainder of last year with zero issues.
I used this but I’m sure any good quality heat sink compound/paste will suffice.
It’s a tiny little tube but more than enough for the wells that those 2 switches sit in.

 

[atxjmy512]

Yeah The insulation is automotive header wrap. I only used that because I had some left over from my Chevelle. I think basic fiberglass insulation packed in there would be as effective.
The thermal paste, I used CPU heat sink compound. You don’t need much at all.
It ran the remainder of last year with zero issues.
I used this but I’m sure any good quality heat sink compound/paste will suffice.
It’s a tiny little tube but more than enough for the wells that those 2 switches sit in.

The insulation is automotive header wrap. I only used that because I had some left over from my Chevelle. I think basic fiberglass insulation packed in there would be as effective.
The thermal paste, I used CPU heat sink compound. You don’t need much at all.
It ran the remainder of last year with zero issues.
I used this but I’m sure any good quality heat sink compound/paste will suffice.
It’s a tiny little tube but more than enough for the wells that those 2 switches sit in.

Thanks. How did you get those little screws out in the sensors? Did you have to remove both the heat sink and the metal frame above it to get access?

 

[JamesR]

I used a Chapman set. It’s a little ratchet with a screwdriver bit in it. It’s good for tight spaces.

 

[atxjmy512]

I used a Chapman set. It’s a little ratchet with a screwdriver bit in it. It’s good for tight spaces.

I managed to do it by removing two screws in the metal shelf and angling it up, not the easiest but got it all done. That’s a cool set though, I’ll have to pick one up.

 

[Beeba]

Hi all -

I have a Raypak 406A Heater. Lately I've been getting a High Limit 2 error. I'm not sure what this is or what could cause it beyond one of the thermometers is getting too hot. What could cause this and is there any way for me to check it myself? I'm fairly handy but heaters are a bit out of my comfort zone.

I had the same thing when I turned my heater on this year and my heater is less than a year old. My heater was also making a weird noise and that let me know to check that part. I change the unitherm governor and now it’s working perfectly