AGS light on Pentair Mastertemp 400

[JimmyGCT]

Hello Everyone,
Hopefully, someone knows a bit about Pentair Mastertemp 400 units.
I bought a house a couple of years ago so not sure how long the heater has been here. When I start it up, it will heat for a couple of minutes, then shut down saying "Service Heater." I decided to do some digging and replaced the water valve, panel, and the piece that is identified in several YouTube videos for the AGS error light. Want to put the right part back after sanding the old one since the issue persists, but now have very similar looking sensor screws. One says L135F and the other says L140F. Which should be the cutest one for the gas valve? Thanks for any help with this issue.

 

[ajw22]

High Limit Switch opens at 135F.

AGS switch opens at 140F.

Pentair MasterTemp Heaters - Further Reading

www.troublefreepool.com

 

[JimmyGCT]

Thanks, will check that and try. Much appreciated

 

[JamesW]

AGS has a yellow dot.

Goes on the right side and has red wires.

 

[JamesW]

42002-0025S 140F Automatic Gas Shutoff Switch Replacement for Pentair MasterTemp & Max-E-Therm Pool and Spa Heater Electrical Systems

 

[JamesW]

 

[JamesW]

 

[JimmyGCT]

Thank you James!

 

[JamesW]

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[JamesW]

474368Z Automatic Gas Shutoff Switch (AGS)

Automatic Gas Shutoff Switch (AGS). 42002-0025S.

BRAND NEW SHUT OFF SWITCH, PENTAIR 42002-0025S. 474368
MPN 08-059000-201.
120V, 50/60HZ, 1A, 30VDC, L140 DEGREES F. CSA APPROVED.

https://www.kidde-fenwal.com/Media/Data%20Sheets/DS_F-08-05-001.pdf

https://www.techritecontrols.com.au/cms/uploads/Techrite-Controls-Fenwal-Fenwal-08-05-Bimetal-Thermostat-1761.pdf

https://www.techritecontrols.com.au/cms/uploads/Techrite-Controls-Fenwal-08-05-Bimetal-Thermostat-2091.pdf

 

[JamesW]

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