Frigidaire · Dishwasher
Frigidaire Dishwasher iH0 Error Code
Firmware or software mismatch
What this error means
iH0 appears when control firmware versions conflict—often after replacing only one board.
How IH0 is detected
Heating faults such as IH0 appear when the Frigidaire dishwasher control energizes the bake element, broil element, gas valve, or drying heater but does not detect expected temperature rise within the monitoring window. On Frigidaire FGID2479SF, Frigidaire FDPH4316AS, and similar variants, open heating elements, failed igniters on gas dryers and ranges, or welded heater relays on the control board produce similar symptoms.
UI replaced without matching main board should be ruled out first. record serial and existing board numbers. On electric ovens and dryers, test element continuity when cool; on gas appliances verify the ignitor glows for at least 15 seconds before the valve opens. Repeated IH0 after confirming heat at the exhaust or oven cavity indicates a sensor or board issue rather than a simple element replacement.
Common causes
- UI replaced without matching main board
- Incorrect service flash level
- Factory pairing lost
- Aftermarket control
Step-by-step fixes
- 1Record serial and existing board numbers
- 2Order UI and control as matched set
- 3Power-cycle after both installed
- 4Avoid mixing boards across model years
When to call a technician
Replace both boards together when iH0 follows single-board repair.
Affected models
- Frigidaire FGID2479SF
- Frigidaire FDPH4316AS
- Frigidaire FFCD2413US
Prevention & maintenance
- Preheat the oven only as directed and avoid foil lining the bottom—blocked airflow causes heat faults related to IH0.
- Record when IH0 appears in the cycle and whether it clears after a 60-second power reset on your Frigidaire dishwasher—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for IH0; Frigidaire uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting IH0; reversed plugs on pumps and valves cause immediate repeat faults.