Pentair Error Codes

Find troubleshooting guides for all Pentair error codes.

10 error codes across 1 appliance types

Poolheater

Code	Meaning	Severity
E05	The pressure switch did not close during the heat cycle, indicating insufficient water flow or a failed switch. high	high
ERR AFS	The combustion air flow switch (air pressure switch) did not close, indicating the combustion blower did not reach adequate speed or air flow is restricted. high	high
ERR IGN	The heater attempted ignition multiple times and failed to establish or hold a flame, triggering a hard lockout. high	high
ERR PS	The pressure switch fault code on IntelliFlo-integrated and newer digital-display Pentair models indicating insufficient water flow through the heater. high	high
HUB	Reference guide covering all Pentair MasterTemp pool heater error codes and fault indicators. low	low
NO-POWER	The heater shows no display, no response to controls, or will not begin a heat cycle despite power appearing to be available. moderate	moderate
NOT-HEATING	E05, E01, and Flow Switch Diagnosis medium	medium
RESET	Procedure for performing a soft reset, hard power reset, and service interval reset on Pentair MasterTemp pool heaters to clear fault codes. low	low
SERVICE-HEATER	The SERVICE HEATER indicator has illuminated, signaling either an annual maintenance interval has been reached or an active fault is present. moderate	moderate
TROUBLESHOOTING	Symptom-based overview guide covering the six most frequent Pentair MasterTemp pool heater failures and how to diagnose each one. moderate	moderate