Pentair Pool Heater E06 Error Code
Check your model first
The source record does not specify an exact model family.
Match the model on your equipment label to the linked manufacturer documentation. The same code can mean different things across model families.
Quick answer
Shorted Stack Flue Sensor Stack flue sensor circuit is shorted. The SFS thermistor is reading near-zero resistance, which the control board interprets as an impossibly high temperature. Water intrusion into the sensor or its connector causing a short, sensor element failed short from overheating, wiring harness pinched or chafed causing a short to ground. Disconnect the SFS and measure resistance.
Severity: high · DIY difficulty: easy
Safety
Stop at the exterior: power-cycle at the disconnect, clean the filter/basket, and check for obvious water-flow blockage. Pool heaters combine gas piping, 240 V wiring, and (on heat pumps) refrigerant — burner, control-board, and sealed-system work requires a licensed technician. If you smell gas, shut the gas valve and leave the area first.
What E06 means
Shorted Stack Flue Sensor Stack flue sensor circuit is shorted. The SFS thermistor is reading near-zero resistance, which the control board interprets as an impossibly high temperature. Water intrusion into the sensor or its connector causing a short, sensor element failed short from overheating, wiring harness pinched or chafed causing a short to ground. Disconnect the SFS and measure resistance. Near-zero (0Ω) resistance confirms a shorted sensor — replace the SFS. Inspect the wiring harness for chafe points in the high-heat flue area. After replacement, verify the vent is not restricted, which can cause the SFS area to overheat.
First checks before service
1. One-time fault event (power disturbance or transient sensor reading) common DIY
Check: Power-cycle at the breaker/disconnect (or unplug for CPAP), restore, and run the system while watching for the code.
Fix: If the code does not return after a full run cycle, the fault was transient — monitor, no repair needed.
2. Fault persists after a clean reset occasional pro only
Check: If the code returns immediately or every session, note the conditions (startup, heating, after rain).
Fix: A persisting code points at the component the manual assigns to this code — that repair is technician territory.
Sources
- PoolDial error-code reference (manual-backed) — verified 2026-08-29
- Pentair MasterTemp/Max-E-Therm Heater Installation & User's Guide (Section 5 Troubleshooting) — verified 2026-08-29