The heater started a week ago when I opened the pool. The temperature went up to 77 then the heater shut off. I have not been able to get it to run since. It starts and within 5 seconds it shuts down and displays that error code
AGS - Auto Gas Shutoff = Because of a problem sensed, the gas valve is closing, stopping gas supply and hence heater shutoff.
Improper water flow through heater! Check filter, pump, water supply lines, anything that will reduce water flow into heater.
A faulty Pressure Switch may cause this problem as well.
or...
In coming water to heater is over 104°
If all is good with the above, replace the AGS Switch.
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