Buzzing, grinding and rattling from an Amana microwave each have a normal explanation and a fault explanation, and the difference is usually whether the sound changed suddenly. Top of the list on this build: turntable rollers or track dirty or worn. Nothing below asks you to work on a live circuit or a sealed system.
The observable symptoms
- Loud hum that has always been present — From experience, transformer hum is normal on most designs.
- Buzzing with poor heating — From experience, stop using it.
- Grinding that follows the turntable rotation, in detail — A noise in time with the tray points at the rollers or the coupler, more often than not.
- Crackling or arcing sounds inside — On most units, arcing is a stop-immediately symptom.
- Fan noise continuing after cooking ends on an Amana microwave — In the field, it is normal behaviour.
Causes ranked for this build on an Amana microwave
- Turntable rollers or track dirty or worn — Nine times in ten, it is the most frequent noise complaint. It leads the order because it accounts for more of these calls than anything below it, and costs nothing to check. Lift out the tray and the roller ring and wash both.
- Cooling fan obstructed or worn — Start here: a fan pulling through a blocked vent is loud and hot. Note whether the noise is present from the moment the unit starts.
- Drive coupler worn or misseated — It also stops the tray rotating properly. Inspect the coupler under the tray for wear and correct seating. It ranks in the middle because it is frequent enough to check early and not the first thing to likely candidate.
- Transformer hum — In the common case, the high-voltage transformer hums by design and gets louder with age on some designs. Compare with how it sounded when new.
- Stirrer or its cover loose — In the field, the stirrer above the cavity rattles when its cover works loose. Note whether the noise continues with the tray removed.
- Magnetron or high-voltage component failing — Start here: a new buzzing with weak heating is the serious combination. Test heating with a cup of water and note the time it takes to warm.
The sequence of checks
- First: turntable rollers or track dirty or worn — With an Amana microwave in front of you, watch for a cracked roller or a chipped track. This step follows the one above because the two share a symptom and only one of them survives it.
- Second: cooling fan obstructed or worn — It is placed here because everything above it is cheaper to eliminate and more frequent. Inspect the vents for grease and dust build-up.
- Third: drive coupler worn or misseated — Turn the tray by hand and feel for play. It ranks here because the causes above it explain the same symptom more frequently.
- Fourth: transformer hum — It sits here because it removes the largest group of causes for the least effort. Note whether the hum has changed rather than whether it exists.
Steps you can take now
- Check the drive coupler — Nine times in ten, lift the tray and inspect the coupler for wear, then reseat it and turn the tray by hand. Do not force a tray that will not seat.
About 10 min
- Test the heating — Stop using the unit if heating has fallen off, on an Amana microwave in ordinary household use. Compare heating time with what the unit used to manage.
Tools: Mug, TimerAbout 5 min
- Clear the vents — Wipe grease and dust from the intake and exhaust vents with a damp cloth. Unplug the microwave before cleaning around the vents.
Tools: Damp clothAbout 15 min
- Run it empty of the tray — Remove the turntable and the roller ring, in ordinary use, put a cup of water in the cavity and run a short cook. If the noise goes with the tray, the fault is the tray system.
Tools: Mug of waterAbout 10 min
Safety notes
Safety
A microwave is not an appliance to open, whatever the fault. Unplug the appliance or switch off its breaker before removing any panel; a capacitor can hold a charge after the power is off. A unit that runs on its own is unplugged, not diagnosed.
When to call a technician
Call a technician when the noise is accompanied by weak heating, arcing or a burning smell, or when it persists with the turntable removed. If you reach the end of the list without an answer, what remains requires test equipment rather than more looking.
References
General guidance- Manufacturer service manuals; OSHA control of hazardous energy standard — Manufacturer service manuals; OSHA control of hazardous energy standard, fetched
Related pages on other brands
Scope of this page
This page covers the class rather than the model. Panel layouts, code lists and part numbers vary within the same brand. Treat the ranking as a starting order for this class, and let a model manual override it wherever the two disagree. A more specific page for a particular Amana family or model does not exist yet. When it does, this page will link down to it and defer to it. The other problem pages for this appliance are indexed at amana-microwave-problems.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
