Pentair Pool Heater Error Code 13: How to Fix It

Q: What does Error Code 13 mean on a Pentair pool heater?

Error Code 13 on a Pentair pool heater indicates an ignition failure. This means the heater attempted to start and ignite the burner but was unable to do so within its allowed number of tries. The heater shuts itself down as a safety measure and displays Code 13 until the root cause is resolved.

Q: Can I reset a Pentair heater Error Code 13 without fixing anything?

You can reset the heater by powering it off, waiting a few minutes, and powering it back on. However, if the underlying cause — such as a dirty igniter, blocked burner, or low gas pressure — has not been addressed, the error will almost certainly return during the next ignition attempt. A reset alone is not a fix.

Q: How much does it cost to repair a Pentair pool heater ignition failure?

Costs vary widely by cause. A DIY cleaning of the igniter and flame sensor costs very little beyond your time. Replacement parts such as an igniter, flame sensor, or gas valve typically range from $20 to $200 depending on the component and your heater model. If you hire a pool or HVAC technician, expect to pay $100 to $300 for labor plus parts, though complex gas valve or control board failures can push costs higher.

Q: Why does my Pentair heater keep getting Error Code 13 every season?

Recurring seasonal ignition failures are most commonly caused by insects — especially spiders — building nests inside the burner tray and venturi tubes during the off-season. When the heater is shut down for winter or extended periods, bugs find the warm, sheltered interior ideal for nesting. The solution is to thoroughly clean the burner assembly at the start of each season and, if possible, cover the heater's flue and air intake openings with insect-screen covers during storage periods.

Q: Is Pentair Error Code 13 dangerous?

The error code itself is a safety feature — the heater stops trying to ignite to prevent raw gas from accumulating in the combustion chamber. As long as you do not detect a strong gas odor and the heater is powered off, the situation is not immediately dangerous. However, if you smell gas at any time, treat it as an emergency: leave the area, shut off the gas supply, and contact your gas utility or emergency services before attempting any inspection.

Abstract

Error Code 13 on a Pentair pool heater signals an ignition failure — meaning the heater tried to light but could not successfully ignite the burner. This is a high-severity issue because your pool will not heat at all until it is resolved. Common causes include a faulty igniter, blocked gas supply, dirty burner, or a failed flame sensor, but most can be addressed with basic tools and a methodical approach.