Pentair Pentair MasterTemp 400,000 BTU Gas Pool/Spa Heater r13 Error Fix: Flame Rollout — Primary

Error code r13 on the Pentair Pentair MasterTemp 400,000 BTU Gas Pool/Spa Heater means: Flame Rollout — Primary. The primary flame rollout switch has tripped. DANGEROUS CONDITION — flames are escaping the combustion chamber. This can be caused by a blocked or cracked heat exchanger (combustion gas cannot exit normally, so flames roll back out of the burner area), a blocked exhaust vent, or excessive wind conditions affecting combustion. Shut down the heater immediately. The flame rollout switch must be manually reset — it has a small red button that must be pressed (located near the burner tray area). DO NOT reset and operate without determining the cause. Have a qualified technician inspect the heat exchanger, burner tray, and venting before resuming operation.

The most successful fix is "Inspect and Repair Heat Exchanger and Burner Assembly" (hard difficulty, ~120 minutes). Estimated DIY cost: $0-$50. HomeMD has 2 community-ranked fixes for this error.

This error is rated critical severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Inspect and Repair Heat Exchanger and Burner Assembly") is rated hard difficulty and takes about 120 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Flashlight, Soft brush, Vacuum.

DIY cost: $0-$50. Professional repair typically costs $300-$500. Many homeowners save money by trying the top-ranked community fix first.

The Pentair Pentair MasterTemp 400,000 BTU Gas Pool/Spa Heater has 8 other known error codes, including: AFS (Air Flow Switch Fault), AGS (Auto Gas Shutoff), bd (Board Error), BURNER DEBRIS (Burner Tray Obstruction), BYPASS VALVE (Bypass Valve Adjustment Needed), and 3 more.