Hayward Pool Heater PF Error Code

Updated 2026-08-29 · review status: manual-verified Last verified: 2026-08-29

Quick answer

Power Fault / Low Voltage Supply voltage polarity reversed or voltage too low. Heater will not fire. Hot and neutral wires reversed, voltage drops below acceptable level under load, undersized or damaged field wiring, incorrect voltage selector setting. Verify correct wiring polarity at heater terminals. Check voltage selector (120V vs 240V) matches supply. Measure voltage under load—should be wit

Severity: high · DIY difficulty: intermediate

Safety

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What PF means

Power Fault / Low Voltage Supply voltage polarity reversed or voltage too low. Heater will not fire. Hot and neutral wires reversed, voltage drops below acceptable level under load, undersized or damaged field wiring, incorrect voltage selector setting. Verify correct wiring polarity at heater terminals. Check voltage selector (120V vs 240V) matches supply. Measure voltage under load—should be within 10% of nominal.

Causes, ranked

  1. 1. 120V supply polarity reversed, low voltage, or insufficient ground path common diy-ok

    Check:

    Fix:

  2. 2. Facility wiring/ground fault (electrician required) occasional pro-only

    Check:

    Fix:

Parts & supplies for Hayward Pool Heater: filters, control boards, sensors, and common replacement parts.

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Sources

  • PoolDial error-code reference (manual-backed) — verified 2026-08-29
  • Hayward H-Series H150FD-H500FD Service & Installation Manual (Figure 27: Error codes) — verified 2026-08-29
  • PoolDial error-code reference (manual-backed) — verified 2026-08-29