Sta Rite SR200NA AFS: heater fires up but turns off after ~30mins with AFS light

robertchavez90

New member
Jan 29, 2025
1
Northern California
Pool Size
20000
Surface
Plaster
Chlorine
Liquid Chlorine
Hi folks,

I'm investigating an issue with my Sta Rite SR200NA pool heater. Shortly after I turn on the device, the heater seems to fire up and hot air is coming out of the exhaust, a seemingly normal operation. However, after about 30 mins of runtime, the blower (not sure of correct terminology?) shuts down, and the top panel "Service System" light illuminates. Thanks to some posts here, I learned to open the device and find the error code LED for the Air Flow System (AFS) light is also illuminated.

Does this behavior indicate that there's simply something wrong with the AFS sensor, and that ~$100 part should be replaced? Or is there a more serious issue some where in the system? I've done my best to clear out any potential debris, but have not yet fully opened the heating chamber.

For what its worth, the temperature of the water entering the pool does not feel noticeably warm, but I'm not exactly sure if it should be in a 44F pool (new homeowner and first time pool).

Thank you for any advice, happy to provide more details as needed!
 

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