Buzz
Guide to diagnosing and repairing your GE microwave
If your GE microwave is turning on but not warming your food, there are multiple reasons behind this issue. From misconfigured settings to a malfunctioning magnetron, this guide will walk you through the troubleshooting process. With insights from appliance repair expert Gevorg Grigorian, we'll show you how to fix the problem, or help you decide if it's time for a new microwave instead of a costly repair.
Reasons Your GE Microwave Might Not Be Heating
Common issues include mistakenly using the "Timer" setting instead of "Cook", having the Demo Mode activated, or setting the power level too low. Additionally, make sure the door latch is secure and that the outlet is functioning properly. If the issue persists, the magnetron may be faulty. Depending on your microwave model, replacing it might be more affordable than repairing it.
How to Fix It
How to Troubleshoot a GE Microwave That Won't Heat
Check if the "Timer" function is active. GE microwaves can be a bit tricky when it comes to their controls. Typically, you’ll need to press the Time Cook, Cook, or Cook Time buttons to start heating. However, there’s also a kitchen timer button, usually labeled Timer, Kitchen Timer, or Timer On/Off, which only counts down time but doesn’t heat your food. If you’ve accidentally pressed one of these, the timer will run, but no heat will be produced.
Deactivate Demo Mode. Certain GE microwaves feature a "Demo Mode" that allows the microwave to turn on and appear functional but without generating heat. If your microwave is new and not heating, it’s likely Demo Mode is enabled.
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For countertop models
- Unplug the microwave for a full minute.
- Replug it in, and when the display shows time or info, press and hold both POWER LEVEL and 0 for at least 3 seconds.
- Be quick after plugging it back in, as this has to be done immediately. If you miss it, unplug for another full minute and try again.
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For over-the-range models
- Unplug the microwave for at least 3 minutes or turn off the circuit breaker for the outlet.
- Plug the microwave back in.
- When the clock appears, press and hold POWER/TEMP and START for 3 seconds or more.
Adjust the power level. If your GE microwave isn't heating your food properly, it might be because the power level is set too low. On most models, adjust the power level by entering the cook time, pressing Power Level, and selecting a number between 1 and 10—10 being the highest setting for maximum heat.
Ensure the door is fully closed. If your microwave turns on the light but doesn’t start heating, the door may not be closing properly. Open the door and check for any food or debris near the latch. Once you’ve cleaned the area, close the door securely and test it again.
- If the door doesn't latch properly, unplug the microwave, and clean around the door latch using a mild, non-abrasive cleaner. GE recommends Cerama Bryte appliance cleaner.
Check the power supply. If your microwave won't power on at all, the issue may lie with the power cord, outlet, or even a blown fuse or tripped breaker. If it turns on but doesn't heat, the microwave may not be receiving adequate power from the outlet.
- Ensure the power cord is securely plugged into a 120-volt outlet. For over-the-range models, the cord typically exits the top-right of the unit, and the outlet can usually be found in the cabinet above it.
- For over-the-range models, confirm that the outlet is connected to a dedicated circuit.
- If the microwave still doesn’t work, try plugging a different device into the outlet to check its functionality.
- Look for a tripped breaker in your breaker box.
Should I consider replacing my microwave?
If no solution has worked, it may be time for a repair. If the microwave is operating but not heating, the magnetron is likely the culprit. GE advises against further troubleshooting or attempting to replace these components yourself due to the potential danger—seriously, it could be fatal.
- For less expensive countertop models, replacing the microwave may be more cost-effective than repairing the magnetron. A new magnetron typically costs between $100 and $250, and most appliance repair services charge $50 to $150 per hour.
- If you own a high-end model like the GE Profile 30" built-in over-the-range unit, which can cost nearly $2000, calling a professional for repairs is the better option. If you’re experienced with electronics or a technician, you can test and replace the magnetron yourself.
EXPERT ADVICE
Gevorg Grigorian
Appliance Repair Expert
Appliance Repair Expert
Microwaves are becoming more replaceable these days. Often, replacing a microwave costs less than repairing a specific component. As a result, most people opt to replace their microwave when a part fails.
How to Test Your Microwave's Magnetron
Gather insulated screwdrivers and a multimeter. GE advises that only professionals should attempt this. If you're a technician or have good knowledge of working with high-voltage electronics, this guide will help you test the magnetron and decide if it needs replacing.
- Before testing the magnetron, you must discharge the high-voltage capacitor, as it can retain dangerous electricity even when the unit is unplugged. The safest method is using a capacitor discharge tool. These tools resemble tweezers and allow you to safely discharge the capacitor without sparks.
- You may also use two small insulated awls or screwdrivers, although this might cause a small spark or pop.
- Using a single screwdriver is not recommended, as it’s difficult to make contact with both points at the same time—space is tight inside the unit.
- For testing the magnetron itself, you can use any multimeter, whether digital or analog.
- To remove the microwave’s chassis, you’ll need some screwdrivers. Depending on the model, the screws may be Phillips or Torx. It’s best to have a full set of screwdrivers on hand just in case.
Unplug your microwave before starting. Place the microwave on a flat, clean table if you haven’t already. For over-the-range models, remove the screws from the mounting brackets, then carefully slide the microwave out and set it on a flat surface.
- Grigorian recommends having a second person help with removing the microwave, as it can be quite heavy. He also suggests protecting your countertops and stove during the process. "Place a moving blanket over the stove to safeguard it," he says, "and clear any glassware from the countertops in case the microwave falls."
Remove the outer casing of the microwave. Typically, you'll need to unscrew fasteners from the rear, sides, top, and bottom to fully remove the outer case. There’s no need to take off the door or the front panel. Be extremely cautious—don’t touch anything inside the microwave, as several components can store a lethal charge, even when the appliance is unplugged.
- First, open the door and take out the glass plate and the spinner before removing the outer casing.
- The specific steps to remove the case can vary by model. On some microwaves, you may need to unscrew the top two screws above the door, open the door, and slide out the grill before removing the rest of the case.
Discharge the high-voltage capacitor. To begin, locate the high-voltage capacitor, which can usually be accessed from the top or side of the microwave. It resembles a small metal box with a black cylinder sticking out, and red and white (or sometimes both white) wires connected to it. Note: A mistake here can be deadly—if in doubt, call a professional.
- If you're using a discharge tool, hold the insulated end (don’t touch any metal!), and place each metal end on the terminals. The tool will indicate when the capacitor is discharged.
- If using two insulated screwdrivers or awls, touch the metal ends to the terminals. Cross the tools over each other so they connect the terminals and short the capacitor. You may hear a pop or see a spark—this is completely normal.
Disconnect the magnetron's wires. The magnetron might have one or two connectors to unplug. It’s typically found by tracing the wires connected to the high-voltage capacitor. After ensuring the capacitor is discharged, you can safely detach the wires from the magnetron, as they’re no longer live with electricity.
Remove the magnetron by unscrewing it. It’s a good idea to take a photo of the wiring setup before you begin. The screws holding the magnetron might be tricky to remove, and you may need to take off additional panels to access them, depending on your microwave model. Unscrew all the required fasteners, gently pull the magnetron out of its compartment, and disconnect the wires from the thermal protector.
Test the magnetron with your multimeter.
- Set your multimeter to the lowest resistance setting (ohms).
- Touch the black lead to one terminal of the magnetron, and the red lead to the other terminal.
- If the multimeter reading doesn’t change, there’s no continuity, and the magnetron is faulty.
- If the display shows a reading between 0-5 ohms, the magnetron is working properly and doesn't need to be replaced. At this point, it’s advised to consult a professional.
Replace a faulty magnetron. A new magnetron for your GE microwave typically costs between $100 and $200. If your microwave is a higher-end model, it may be worth the cost to replace the magnetron. You can order the part directly from a local appliance store or search for an OEM replacement online. Once the replacement part arrives, the installation process is straightforward and manageable.
Important Safety Warnings
- Opening up your microwave and interacting with its internal components is highly dangerous. The capacitor can store enough voltage to be lethal. If you're not an expert and lack the necessary experience with high-voltage capacitors, avoid attempting to open the microwave or replace the magnetron on your own.
