Can I fix Pentair code ERR AGS myself?

Start with these safe checks: Confirm full water flow (pump, baskets, filter, valves). Reset by turning the heater's power off and back on. If AGS repeats, call a qualified tech.

When should I call a technician for code ERR AGS?

If AGS repeats, call a qualified tech. Smell gas? Leave right away, don't touch light switches or phones inside, and call your gas utility or 911 from outside. Never open a gas valve, burner, gas line, vent or flue connection, or bypass a safety switch. Repeated lockouts, scorching, soot, or a CO alarm mean shut it off and call a licensed gas technician.

Pentair Pool Heater Error Code ERR AGS / AGS: Automatic gas shutoff

What ERR AGS means

Automatic gas shutoff: water after the second pass through the heat exchanger is over 140°F. The buttons are disabled; you reset it by cycling power.

Also shown as: AGS, depending on the model.

Likely causes

Low water flow
Sensor or limit fault

Safe first checks

Confirm full water flow (pump, baskets, filter, valves).
Reset by turning the heater's power off and back on.

When to stop

If AGS repeats, call a qualified tech.

Checked against: Pentair MasterTemp heater installation and user's guide (Table 8: error and fault codes). Codes can differ by model and year, so confirm with your owner's manual.