Pentair Pool Heater ERR PS Error Code

Updated 2026-08-30 · review status: manual-verified · reviewed by MiniSplitDecoder Editorial Team Last verified: 2026-08-30

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

Water Pressure Switch Insufficient water flow detected before the ignition sequence begins. The pressure switch did not close, preventing the heater from attempting ignition. Pool pump not running, dirty filter causing low flow, closed return valve, undersized pump for heater flow requirement, failed or mis-adjusted pressure switch. Confirm the pump is running with solid prime. Check filter pressu

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 ERR PS means

Water Pressure Switch Insufficient water flow detected before the ignition sequence begins. The pressure switch did not close, preventing the heater from attempting ignition. Pool pump not running, dirty filter causing low flow, closed return valve, undersized pump for heater flow requirement, failed or mis-adjusted pressure switch. Confirm the pump is running with solid prime. Check filter pressure gauge — clean or backwash if elevated. Open all suction and return valves. Verify pump speed is high enough (MasterTemp 125/175: 20+ GPM minimum; 250/400: 40+ GPM minimum).

First checks before service

This page currently documents the safe reset triage. If the code returns, use the linked source manual or a qualified technician for code-specific diagnosis.

  1. 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. 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.

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Sources

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