What F4E4 Means
F4E4 is published as a possible problem with the humidity thermistor or the associated wiring, the same part named by F3H. As with the cavity thermistor codes, the different number is a different check on one sensor.
Common Causes of F4E4
- Transient fault cleared by a reset
- Sensor fouled by cooking residue
- Connector loose
- Humidity thermistor failed
🔧 One Safe Check You Can Try
Switch the microwave off at its circuit breaker for one minute, restore power, then run a short heating test with a cup of water to verify operation, which is the check Maytag asks for. Use manual time and power settings meanwhile and avoid sensor cooking programmes, which rely on the part that has reported a fault. Test with a cup of water to confirm the microwave itself still heats. If both F3H and F4E4 have appeared, mention both when booking, because together they point clearly at the humidity sensing rather than at the control.
⚠ Why You Shouldn't Go Further Than That
- A microwave oven holds a high voltage capacitor that can retain a dangerous charge long after the appliance is unplugged, so the cabinet is never opened at home under any circumstances.
- An over-the-range unit is mounted above a cooking surface at head height and is heavy enough to need two people and a support to remove safely.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.