Microwaves fault codes by brand

How microwaves fault codes work

Two things about this category are different from everything else on this site, and both of them change what you should do rather than just what you should know.

The first is that unplugging a microwave does not make the inside of it safe. Every other appliance here can be made harmless by an owner in about four seconds, and all of our advice leans on that. A microwave holds a high-voltage capacitor, and it stays charged with the plug out. The manufacturers' own service manuals are unambiguous about it — Samsung's instruction to their engineers is that "before touching any components or wiring, always unplug the oven and discharge the high voltage capacitor", and they give a figure: the capacitor "remains charged about 30 seconds after disconnection". Whirlpool put the same warning on their microwave tech sheets, with the consequence spelled out — high voltage at the magnetron and capacitor terminals, "avoid direct contact ... to avoid serious injury or possible death". Panasonic's inverter manuals say plainly: do not try to repair the inverter board. The practical upshot is short. On a washing machine, "unplug it and have a look" is reasonable advice for a competent person. On a microwave it is not, and no code on these pages is worth taking the cover off for.

The second is that the door is not a lid. It is a radiation shield, and the mechanism behind it is a containment system rather than a catch. BS EN IEC 60335-2-25, the standard these appliances are built to in the UK, requires at least two independent interlocks with one of them monitoring the others. What that monitor does when it detects a problem is the most useful thing in this category, because it explains the single most common way a microwave dies. In the manufacturers' own words: "The monitor switch is provided to monitor the operation of the primary interlock switch. If the primary switch fails to operate when the door is open, the monitor switch will form a short circuit across the supply and the fuse in the oven will blow." That is deliberate. The appliance is designed to destroy its own fuse rather than run the risk of producing microwaves with the door open. So a microwave that has gone completely dead — no display, no light, nothing — is very often the safety system working exactly as intended, and the popular advice to simply fit a new fuse is the worst advice on this site. The service manuals say that if the monitor switch blew the fuse, the interlock switches are replaced as a set, not the fuse on its own.

Then the awkward fact about the codes themselves: most microwaves cannot show you one. A great many of the machines sold in the UK have no display beyond a clock, and among the brands that do have displays the published code sets are short and wildly uneven. Panasonic list eleven H-codes on their own troubleshooting page and publish an explanation for not one of them — while a different answer on their own UK support portal explains four of the eleven, hedging every line, so whether Panasonic have told you what your code means depends on which of their pages you happen to land on. Bosch publish exactly one microwave code, E-11, and dispose of the entire rest of the numeric space with a single row reading "Exx". Samsung publish six and then say in terms that anything else needs a technician. LG publish seventeen entries with a real meaning attached to each, which is the best owner-facing table in this category, and bury it behind seventeen buttons that have no address of their own — so nobody searching for their code will ever land on it. And Miele publish no codes at all: their microwaves put English sentences on the display instead, which means an owner searching for a Miele microwave code is searching for something that does not exist. Sharp are a category of their own: twenty-five of their twenty-seven current UK manuals contain no codes, and their two combination models publish four, including an E04 that no other brand anywhere documents. Where a manufacturer has published nothing, our page says they have published nothing rather than borrowing a table from somewhere else.

Two findings about the cheaper end of the market are worth knowing before you search for your badge. The first is that a lot of the budget brands publish nothing whatsoever — twenty-one Russell Hobbs manuals, twenty-two Morphy Richards, thirteen Cookworks, all with no codes in them, and Tower publish no instruction manuals at all — so for those appliances there is no code list to find and symptom-based diagnosis is the only route. The second is that where they do publish something, several of them are publishing the same thing. E01, E02 and E03 are one inherited table that appears under Daewoo, De'Longhi, Statesman and Sharp badges, on appliances that share an original manufacturer and in two cases share a platform designator, with only the cancel button differing between badges. That table lives on our all-brands page rather than under five brand headings, which is also why it is worth checking whether the code you are searching belongs to your manufacturer or to the factory they both bought from.

Then the badge, which as everywhere else on this site is often not the manufacturer — but be careful with the usual shortcut here, because in this category it fails in a way we have not seen anywhere else. Bosch, Siemens and Neff are one company running one shared troubleshooting service. On ovens, Neff and Siemens serve a populated fault-code table from it and Bosch serves an empty one, which is why there is no Bosch oven code table on this site. On microwaves it is the other way round: Bosch and Siemens return the same populated set, and Neff returns nothing at all. Same company, same service, opposite answer, two appliances that sit in the same kitchen. So "these three brands share the same codes" is not a fact about the group — it is a fact about one appliance at a time. Hotpoint, Indesit and Whirlpool are another such group, and there we found the public pages contradicting the group's own service documentation rather than matching it: Whirlpool's built-in microwave error codes are the clearest case, because their public pages under that heading describe oven parts and their engineers' tech sheet for the same appliances uses a completely different set of codes. The brand pages here are built from the service documentation and say where the public tables disagree with it.

One more thing about Bosch specifically, because it is unusual enough to be worth a warning. They hold microwave troubleshooting answers on their own UK site and publish no page that reaches them. Every support address that ought to lead a Bosch microwave owner to Bosch's own answer returns a 404, while Siemens publish the identical answers behind a working tool. And roughly a third of what is in that dataset is about an oven — one entry is a steam-oven water-circuit procedure, another is about a door locked by an interrupted pyrolytic cleaning cycle, and no microwave has either. Our Bosch pages say which entries can actually happen on a microwave.

One scope note, because it decides whether you are in the right place. This category is standalone microwaves — freestanding, countertop and built-in microwave-only models, with or without a grill. A combination *oven* with a microwave function is filed under ovens, because that is where its manufacturer files it and because the codes it shows are oven codes about temperature sensors and door locks. If your appliance is a full-size built-in oven that also does microwave, start in ovens.

A short list of things that are not faults, all published by the manufacturers themselves. A microwave showing "Cooling" is running its fan to clear heat off the electronics, and Panasonic describe it as normal operation. One showing "HOT" or "HOT INSIDE WAIT" is telling you the cavity is too warm from the last thing you cooked for an automatic programme to be set — Panasonic's advice is to open the door to speed the cooling up. A display showing "D" or "DEMO MODE" is in the shop-floor mode, where the appliance lights up and appears to run without ever making any microwaves, and it survives being delivered to your house. And a keypad that does nothing while a padlock or the word LOCK sits on the display is the child lock, which almost every brand sets and clears by pressing one button three times.

Finally, two habits that damage a microwave rather than reporting damage. Never run it empty or with nothing but a very small item in it: the energy has nowhere to go but back into the magnetron, and that is the one thing an owner can do that reliably shortens its life. And if you can see arcing — bright sparks, usually accompanied by a smell of scorching — stop and look at the waveguide cover, the small panel on the cavity wall, before running it again. Manufacturers list arcing damage to the door seal and sealing surfaces as one of the safety checks to make before an oven goes back to its owner, which tells you how they regard it.