F4E4 in plain terms
F4E4 means there may be a problem with the humidity thermistor or its associated wiring. On most units the fault affects the programs that judge doneness from steam rather than basic heating, so the decision is less urgent than it looks: you can cook by time and power while you weigh the repair, which is a technician's job because the thermistor sits inside the cabinet.
Error codes
Reference| Code | Meaning |
|---|---|
| F4E4 | There may be a problem with the Humidity Thermistor or the associated wiring. |
What you see with F4E4
- Sensor programs refused or stopping with F4E4 — The programs that need a humidity reading cannot run.
- Timed cooking still working — Basic heating does not depend on the humidity reading on most units.
- Auto programs giving poor results before the code — A thermistor that was reading badly before it failed.
- The code returning after every reset — A lasting fault rather than a passing glitch.
Causes of F4E4, ranked
- The humidity thermistor — First: the documentation names it, and it works in the warm, steamy air leaving the cavity.
- Its connector — Second: corrosion or a loose plug in a humid part of the cabinet.
- The wiring to the control — Third: a lead damaged by heat, or disturbed during installation or an earlier repair.
- A passing misread — Last: a code that clears with a reset and stays away.
What to check first for F4E4
- Reset once — Confirms whether the fault is lasting.
- Weigh how often you use sensor programs — Decides how urgent the repair is for you.
- Ask how the unit is reached — Front access or removal from the wall changes the labour.
- Have the thermistor and wiring tested — Before any part is ordered or a price agreed.
What an owner can safely do about F4E4
- Reset the unit — Unplug it or switch off its breaker for a minute, then restore power.
Tools: breaker panel accessAbout 3 min
- Cook by time and power — Use the manual's time and power guidance in place of sensor programs, checking food as it cooks.
Tools: owner's manual
- Find the model and serial numbers — They are on the rating label, often visible with the door open; parts and labour quotes depend on them.
Tools: flashlightAbout 3 min
- Ask for a test-first quote — Request that the thermistor and wiring be tested, and the access method confirmed, before a price is agreed.
About 2 min
Safety before you start
Safety
Unplug the unit or switch off its breaker before cleaning it; a capacitor can hold a charge after the power is off. Never remove the outer cabinet of a microwave or combination unit: the high-voltage capacitor inside can hold a lethal charge after unplugging, and the door switches must never be defeated. Do not try to take a wall-mounted unit down yourself; it is heavy and its mounting must be refitted correctly.
When to book a service call for F4E4
Call when you are ready to restore sensor programs, or sooner if F4E4 comes with any other fault, a burning smell or an unusual noise. The technician tests the thermistor and its wiring, confirms how the unit is reached, and quotes on that basis, so ask about the access method when you book.
Nearby Amana oven codes
What this reading does not cover
This reading of F4E4 applies to Amana units whose control reports the humidity thermistor or its wiring with this code, as the table states, most often units with humidity-based sensor programs. Access, programs and part locations vary by model, and a model-specific page, where one exists, is the better guide. None is listed for F4E4 yet; start at the Amana oven code index below.
All Amana oven codes
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