Can I fix Pentair code ERR SFS myself?

Start with these safe checks: Cycle the heater's power once to reset. If SFS repeats, shut the heater off and call a qualified tech. It's a combustion fault.

When should I call a technician for code ERR SFS?

If SFS repeats, shut the heater off and call a qualified tech. It's a combustion fault. 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 SFS / SFS: Stack flue…

What ERR SFS means

The stack flue temperature went over 480°F. The buttons are disabled; reset by cycling power.

Also shown as: SFS, depending on the model.

Likely causes

Combustion or heat exchanger problem
Low flow

Safe first checks

Cycle the heater's power once to reset.

When to stop

If SFS repeats, shut the heater off and call a qualified tech. It's a combustion fault.

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.