Maytag Microwave Error Code F3T4: Meaning and Fix
Reading the microwave display
On a microwave the code replaces the clock on the display. Unplug the unit for a minute to see if it clears, and note the code before you do. Maytag shares the Whirlpool pairing: read the first group, then the sub-code that follows it.
Maytag appliances are built by Whirlpool Corporation on shared platforms, which is why Maytag codes often match Whirlpool ones. Maytag washers, dryers and ranges commonly show F-codes with an E sub-code, or flashing keypad lights. The codes apply to model numbers such as MDB7600AWB, MDB7600AWW and PYE2300AYW; check the label on your unit to confirm yours.
What causes F3T4
- Magnetron is weak or has failed
- Relay or driver circuit on the control board is not closing
- High-voltage transformer or inverter board has failed
- High-voltage diode or capacitor is shorted or open
How to fix it
- Cycle the power: unplug the microwave (or switch off its breaker) for one minute, restore power and test it briefly with a cup of water.
- Before opening any panel, switch off the breaker or unplug the appliance; this circuit can carry line voltage.
- Unplug the microwave and wait at least five minutes; the high-voltage capacitor can hold a dangerous charge.
- Do not remove the cabinet to probe the high-voltage section unless you are trained; the capacitor can be lethal.
- Have a technician test the magnetron, diode, capacitor and transformer using safe discharge procedures.
- Replace the failed component, or weigh the repair cost against a new microwave on inexpensive units.
- Run a full short cycle or function again and confirm the code stays gone before putting the appliance back into normal use.
Parts you may need
Questions
What does F3T4 mean on a Maytag microwave?
It is a fault code from the Maytag control. It indicates a problem with the microwave power section. A power reset is the first thing to try.
Can I keep using the microwave while it shows F3T4?
Stop using it until it has been checked. This fault involves heat, high voltage or sealed-system parts, and running it can damage the appliance or create a safety risk.
Do I need a technician to clear F3T4?
Often yes. Part of this repair means testing live circuits or replacing a control board, so a technician is the safer choice unless you are comfortable with electrical diagnosis.
Other Maytag microwave codes
Sources
Part numbers are OEM references; confirm fit by your model number before ordering. Meanings compiled from manufacturer and parts-retailer documentation; see sources below. Unplug the appliance before opening it.
Applies to models including MMV4205BAW, MMV4205BAS, MMV5000ADW, MMV4205BAB, CMV1000ADW, MMV1153AAW, MMV4205AAS, MMV5156AAS.