--- title: "Microwave runs but does not heat" description: "Dacor microwave runs but does not heat: this is the one symptom on a microwave where we ask people to stop using the appliance until it has been seen." url: "https://dacormiami.support/symptoms/microwave-runs-but-does-not-heat/" date_modified: "2026-09-12" Appliance type: "Microwaves" --- # Dacor microwave runs but does not heat ### What to do in the next ten minutes Stop using the microwave and unplug it if the plug is reachable. Do not remove any panel: the capacitor holds a charge after the power is off. Note whether the machine makes its usual running noise, a louder hum, or is unusually quiet — that difference is genuinely useful to us. If the appliance is a drawer or an over-range unit, note the model from the frame. ### Why this one gets a warning and the others do not Most appliance repairs go wrong by costing money. This one can go wrong by hurting somebody. The capacitor in a microwave holds a charge after the appliance is unplugged, and it does not discharge on its own in any useful timescale. Everything else on this site we are happy to explain in enough detail for an owner to try. Not this. ### Which machines are worth repairing A drawer microwave or an over-range unit is fitted, matched and expensive to replace, and the repairs are ordinary. A countertop machine out of warranty usually is not worth a service call, and we will say so. That costs us the visit and it is the reason the advice on the built-in machines can be trusted. The high-voltage side has failed Magnetron, capacitor, diode or transformer. The machine behaves completely normally because everything except the heating is still working, which is exactly why it is so often described as 'suddenly useless'. A door interlock is not being satisfied Three switches have to agree before the machine will heat. A door that has dropped on its hinges fails them in a particular order, and the result is a microwave that runs and does not cook. The drawer mechanism is not fully closed On a drawer machine the interlock chain includes the drawer's own position. A drawer that stops a few millimeters short leaves an appliance that appears to work and will not heat. Do not open it up The one genuinely dangerous appliance in this kitchen once the case is off. Listen to the running noise Normal, louder, or quieter than usual. It points at the high-voltage side or away from it. Check whether the door or drawer closes fully An interlock problem is the good version of this complaint and the cheaper repair. The light is on, the plate turns, and the food is cold What it usually means Stop using it. The high-voltage side is not a do-it-yourself repair There is no code table for this appliance in either era — just the word ERROR Built-in and drawer machines are worth repairing; a countertop one usually is not What to do in the next ten minutes Stop using the microwave and unplug it if the plug is reachable. Do not remove any panel: the capacitor holds a charge after the power is off. Note whether the machine makes its usual running noise, a louder hum, or is unusually quiet — that difference is genuinely useful to us. If the appliance is a drawer or an over-range unit, note the model from the frame. Why this one gets a warning and the others do not Most appliance repairs go wrong by costing money. This one can go wrong by hurting somebody. The capacitor in a microwave holds a charge after the appliance is unplugged, and it does not discharge on its own in any useful timescale. Everything else on this site we are happy to explain in enough detail for an owner to try. Not this. Which machines are worth repairing A drawer microwave or an over-range unit is fitted, matched and expensive to replace, and the repairs are ordinary. A countertop machine out of warranty usually is not worth a service call, and we will say so. That costs us the visit and it is the reason the advice on the built-in machines can be trusted. ### Is it dangerous to have left it running? No. A microwave that is not heating is not leaking — the two failures are unrelated. The advice to stop is about not making the problem worse and not tempting anybody to open it. ### Can you tell me what the ERROR on the display means? Not precisely, because the appliance does not say. This make's microwave manual uses one generic word for several unrelated conditions and publishes no code table. Any site offering a Dacor microwave F-code has copied it from the wall-oven list. --- **[Read full article: Microwave runs but does not heat](https://dacormiami.support/symptoms/microwave-runs-but-does-not-heat/)**