SplashLens / Pentair / MasterTemp / Max-E-Therm Gas Heater

Pentair E04: Ignition Lockout

Pentair E04 reference for MasterTemp / Max-E-Therm Gas Heater: likely causes, next checks, and manual-verification reminders for pool service techs.

Pentair MasterTemp / Max-E-Therm Gas Heater HIGH Certified tech recommended

What It Means

Ignition Lockout

Likely Causes

Next Checks

  1. Wait 1 hour for automatic retry OR press reset
  2. If E01 kept recurring, diagnose gas/igniter before reset
  3. Manual reset: hold 'Mode' button 5 seconds on some models

Verify Before Repair

SplashLens is a field reference, not a repair guarantee. Confirm the visible code, exact model, and current manufacturer procedure before replacing parts, bypassing safeties, or quoting a customer.

SplashLens is independent and is not affiliated with Pentair or other equipment manufacturers.

Use SplashLens At The Pad

Manual error-code lookup works after the app has loaded once. AI scan features require internet and should be treated as a second set of eyes.