What F3H Means
Maytag attributes F3H to a possible problem with the humidity thermistor or the associated wiring. It works alongside the humidity sensor in the sensor cooking system, measuring the moisture coming off food so the oven can judge when a dish is done.
Common Causes of F3H
- Transient fault cleared by a reset
- Sensor connector loose
- Wiring heat-damaged
- Humidity thermistor failed
- Sensor fouled by cooking residue
🔧 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, since those do not depend on humidity sensing, and test with a cup of water to confirm the microwave still heats. Sensor cooking programmes should be avoided until the fault is cleared - they will either refuse to run or misjudge the food, which is worse than not using them at all.
⚠ 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.