Pentair Pool Heater ERR IGN: Official Meaning and Checks
Direct answer
What ERR IGN means
Official Pentair material describes ERR IGN as Ignition Control Module was not able to ignite the heater. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: ERR IGN, ERRIGN
Before you begin
Safety first
The manual states: DO NOT attempt to operate the heater when ERR HLS, ERR AFS, ERR IGN, ERR AGS, ERR SFS, E01, E05, E06, or 126 is displayed - shut down the heater (see 'TO TURN OFF GAS TO THE APPLIANCE') and have a qualified service technician check the system.
- Record the complete displayed code and the full model number before clearing the display.
- Disconnect power before touching a user-accessible filter, hose, burner, or electrical connection.
- Stop using the equipment if it leaks, smells burned or of gas, smokes, sparks, or trips a breaker.
Does this guide apply?
- Region
- United States
- Product family
- Pentair MasterTemp 125 high performance heater
- Exact models
- Not listed in the cited source. Confirm the full model in the official manual.
- Scope note
- The cited source scope is Pentair MasterTemp 125 high performance heater. Confirm the complete model number before applying the guidance; an empty model list does not imply all models.
Find the model label and official manual before ordering a part
Common paths to check
These are source-backed possibilities, not probability estimates for your specific unit.
- 01 Official source meaning: Ignition Control Module was not able to ignite the heater.
Decision path
Safe checks, in order
- 1
Confirm code and model scope
Compare the complete display and full model number with the cited manufacturer page or manual before applying any troubleshooting instruction.
Expected: The official source explicitly covers the displayed code and product family.
If not resolved: Contact manufacturer support with the full model and serial number.
- 2
Follow the official owner checks
No user repair step is given.
Expected: Only the user-accessible condition identified by the official source is corrected.
If not resolved: Stop repeated resets and arrange qualified service if the code returns or the source directs service.
Reset and test
- Yes: press the HEATER OFF button to clear the error.
Important: A reset may clear the display but cannot repair the underlying condition; follow only the exact model-specific manufacturer procedure.
Escalation point
Stop and arrange service when
- The manual states: DO NOT attempt to operate the heater when ERR HLS, ERR AFS, ERR IGN, ERR AGS, ERR SFS, E01, E05, E06, or 126 is displayed - shut down the heater (see 'TO TURN OFF GAS TO THE APPLIANCE') and have a qualified service technician check the system.
- The equipment leaks, smells burned or of gas, smokes, sparks, overheats, or trips a breaker.
Model-first repair planning
Components that may be involved
The items below describe the documented diagnostic path. They are not a diagnosis and do not identify a compatible replacement part without the complete model and original part number.
- Ignition control module / ignition system
Official sources
We paraphrase manufacturer material and show the publication scope so you can verify it.
- Pentair MASTERTEMP 125 Installation and User's Guide (English), Table 8: Heater Error and Fault Codes, PDF page 44 Pentair · ERR IGN · accessed 2026-08-08
Reviewed by Device Fix Guide · Last source check:
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