Error code
GE / Water heater
F91
DataFlash memory fault.
What it means
DataFlash memory fault.
This explanation is shared only by models whose manufacturer documents the same code, meaning, and guidance.
Manufacturer guidance
- Arrange service, then cycle power to clear the fault as directed in the manual.
Manufacturer source
Models documented with this signal
Select your exact model below to open its manufacturer source. Manual editions and model revisions can differ.
- GE PF40S10FPYUSOfficial source · Source page: 32
- GE PF50S10FPYUSOfficial source · Source page: 32
- GE PF65S10FPYUSOfficial source · Source page: 32
- GE PF80S10FPYUSOfficial source · Source page: 32
- GE PH40S10BPYUSOfficial source · Source page: 32
- GE PH50S10BNYUSOfficial source · Source page: 32
- GE PH50S10BPYUSOfficial source · Source page: 32
- GE PH65S10BNYUSOfficial source · Source page: 32
- GE PH65S10BPYUSOfficial source · Source page: 32
- GE PH80S10BNYUSOfficial source · Source page: 32
- GE PH80S10BPYUSOfficial source · Source page: 32
If there is a safety risk, stop using the appliance and follow the manufacturer’s instructions.