Microwave Not Heating Repair Cost
The microwave lights up, the turntable spins and the timer counts down, but the food comes out cold.
Microwave Not Heating Repair Cost runs $100 to $400 for a pro repair in Arizona, parts and labor included.
- Parts $15 to $180, labor $85 to $200, about 45 to 90 minutes on site.
- Priciest fix is the high voltage transformer, up to $420.
- 0 of 5 common causes are DIY friendly. Difficulty is pro (high voltage).
- No heat is the fault that most often ends a microwave’s life.
Averages for independent repair companies. The service call fee of $75 to $150 is usually applied toward the repair. Costs vary by brand, model, and city.
What causes it, and what each fix costs
Magnetron failure
The tube that generates microwave energy has failed. Everything else works normally, which is exactly why this fault is so confusing to owners.
High voltage diode
A shorted diode stops the magnetron receiving the voltage it needs. Often accompanied by a loud buzz or hum during the cycle.
High voltage capacitor
Fails open or shorted and takes the heating circuit with it. The dangerous component in every microwave.
Door interlock switch (monitor switch)
A partly failed interlock can let the unit run without energizing the magnetron circuit.
High voltage transformer
The least common of the group and usually the one that ends the repair conversation on a cheaper unit.
Repair or replace?
No heat is the fault that most often ends a microwave’s life. On a countertop unit the parts and labor will exceed what a new one costs, replace it. On an over the range unit a magnetron or diode repair at $150 to $400 against a $400+ replacement plus installation is usually worth doing, provided the machine is under about seven years old. On a built in or drawer model, repair almost regardless of cost.
Sources
Where the safety, regulatory and warranty claims on this page come from. Repair costs are our own figures based on Arizona market rates and OEM parts pricing.
- Microwave Ovens, Radiation Emitting Products U.S. Food & Drug Administration The federal requirement for two independent door interlocks plus a monitoring system, and the 21 CFR 1030.10 leakage limit, why an interlock must never be bypassed.
- Electrical Safety U.S. Consumer Product Safety Commission Shock and electrical fire hazards from damaged appliance wiring and grounding faults.
We'll quote you on hauling it away, or buying it.
Not every microwave is worth repairing, and we'd rather tell you that than sell you a repair. If you're replacing it, we'll give you a free quote either way. Scrap pickup for a machine that's finished, or a cash offer if it still has life in it. Working units, recent models and premium brands are often worth real money.
Quick Questions
Can I test the magnetron myself?
No, and this is the fault where people get hurt trying. Reaching the magnetron means working next to the high voltage capacitor, which holds a potentially lethal charge even with the unit unplugged.
It hums loudly and does not heat. What does that mean?
A loud hum with no heat classically points at the high voltage diode, and often the capacitor with it. It is one of the cheaper no heat repairs, so it is worth a diagnosis before writing the unit off.
Is it safe to keep using it if it still turns and lights?
It will not hurt you to run it, but it will not cook either. The bigger risk is that people leave a failing unit in service and it eventually arcs or trips a breaker.
Model specific guides for this problem
Find a microwave repair pro near you.
Browse independent appliance repair companies by city, ratings, hours, and phone numbers, no middleman.