Verified from the manual · Updated October 2026
Toshiba steam oven error codes
2 codes for Toshiba 6-in-1 Compact Steam Oven 20L (MS3-STQ20SE), transcribed from the official documentation with page references.
| Code | What it means | Likely cause | What to do | Service? |
|---|---|---|---|---|
| F01 | Cavity too hot to start the selected function. | When the temperature of the cavity is high, the relevant functions do not operate. | Wait for the cavity to cool, then start again. | Owner fix |
| FILL (with the water-drop icon) | Water box empty or not seated. | The water box is out of water or not installed in place. | Refill and re-seat the water box. If the message stays, the manual says to seek after-sales service. | Owner fix |
Source: Toshiba 6-in-1 Compact Steam Oven 20L (MS3-STQ20SE) instruction manual, p. 71 (Troubleshooting).
Before you call Toshiba
- Refill and re-seat the water tank, and straighten any inlet or drain hose you can reach.
- Run the descale program if the oven has one, with the manufacturer's descaler, not vinegar.
- Switch the oven off at the wall for a minute and back on. One power-cycle is in nearly every manual; repeated resets are not.
- If the same code returns, note it with the serial number and book service. Every sensor, probe, fan or board code above is listed by Toshiba as a service call.
Maintenance that prevents the water codes
Regular descaling with the product your manual names prevents most of the scale-related faults above. Affiliate links, at no cost to you.
A general-purpose steam-oven descaler, for ovens whose manual allows a generic one (Anova says any descaling liquid works). Miele and Thermador name their own descalers; use those instead.
View on Amazon · ~$21
The tablets Miele's own descale program expects. Clears the F20 message on DGC combi-steam ovens.
View on Amazon · ~$22
A soft, non-abrasive cloth for drying the door and cavity after a steam cycle. Every manual we checked rules out scouring pads and abrasive cleaners.
View on Amazon · ~$9