How to reset an oven: the clock, the switch, and the codes

First, find the switch

Almost every guide to resetting an appliance begins with "unplug it", and on a built-in oven that is an instruction you cannot follow. Most ovens fitted into British kitchens draw more than a 13 amp plug will carry, so the kitchen fitter wired them to a dedicated cooker circuit. The isolator is a separate switch on the wall — usually above the worktop, to one side of the hob, sometimes with a red neon — and behind that is a breaker in the consumer unit. AEG's own F102 article tells you to disconnect the oven from the mains, and the honest gloss is that on most of their built-in models there is no plug to pull; Miele's reset instruction for F44 and F60 says the circuit breaker in so many words.

The exceptions are freestanding cookers and the smaller built-in ovens under about 3 kW, which may genuinely be on a 13 amp socket behind or beside the housing. If you can see a plug, unplug it. If you cannot, use the cooker switch, and if you cannot find one of those either, switch off the cooker circuit at the consumer unit. Do not pull the oven out of its housing to look for a plug; it is heavy, it is wired at the back, and nothing you need is there.

Before you reset: five things that are not faults

More oven resets are performed on ovens with nothing wrong with them than on ovens with a fault, because an oven has several ordinary states that look like a failure. Check for these first.

Demo mode. The oven lights up, accepts a programme and never heats. AEG admit it can switch itself on after a power cut, and their exit code is the same on every interface they document: 2 4 6 8, entered through Basic Settings and Service on a command-wheel or touchscreen model. Hotpoint's tell is that the word DEMO appears on the display every sixty seconds, and the exit is in settings. Bosch's manuals mention a letter d or o in the temperature display; their website does not, which is why so many Bosch owners book a repair for a cold oven that is only demonstrating itself.

A flashing clock. On many Hotpoint, Bosch and Neff ovens the time of day is an interlock, and after a power cut the oven will not cook until it is set. Hotpoint say a flashing 12:00 can be confirmed by touching the clock key. On Bosch and Neff ovens, clearing a fault and setting the clock are often the same action — press the button with the clock symbol and the message goes.

SAFE, Loc, a key symbol or a padlock. These are locks, and AEG publish three of them that look alike. SAFE with a cold oven is the child lock: turn the function knob to off first, then hold the two lock buttons for three seconds until the signal tone. A prompt showing B C A is the child lock as well, and the answer is A B C, not 2 4 6 8. A padlock with a hot oven after a cleaning cycle is the pyrolytic lock, and the answer is to wait; see below.

Pr E on a Samsung is the oven preheating, and it clears when the set temperature is reached. Samsung's only instruction is to keep the door shut, because opening it restarts the work. If Pr E never clears on a closed door, that is a real symptom, but it is about the oven not reaching temperature rather than the indicator.

H on a Beko after a self-clean is not in Beko's fault table at all. It means the door lock is still holding because the cavity is hot, and the oven will not cook until it has cooled.

A safety switch-off. Three brands stop an oven that has run at temperature for an unusually long time and say plainly that nothing has failed. Miele's F55 clears with off and on, and they say the oven is ready for use again immediately. Samsung's S-01 is the same idea: turn the oven off, remove the food, try again. Neff's Er3 means the electronics have got warm and the cooling fan is dealing with it; the instruction is to do nothing and let the oven resume by itself. Steady zeros on a Neff temperature display are its automatic switch-off, cleared by pressing any button; flashing zeros are the clock.

The published resets, by manufacturer

Where an oven is genuinely showing a fault code, the manufacturers' resets are a version of isolate, wait, restore, and the waits are not interchangeable.

• Miele publish the only reset they give for an oven on F44 and F60: switch off at the circuit breaker for twenty seconds, restore, and reset the clock. On F60 the wait comes second — first check the oven's air duct is not covered or blocked, because F60 reports insufficient ventilation and a power cycle does nothing to a filler panel over a vent. Miele allow one attempt and then route to customer service. On the codes where they publish no owner action, F134 among them, their sentence is that this is a technical fault you cannot remedy yourself, and cycling the power is not a remedy.
• AEG: for F102, the one F code they define for the UK, the article says to disconnect the oven from the mains for a few minutes, check whether the circuit breaker or RCD for the cooker circuit has tripped, and open and close the door firmly so that it seats on the catch rather than resting against the seal. If F102 comes back, AEG's instruction is to arrange a service visit rather than to try again. For the seventy-odd other F codes AEG list without defining — F113 is their own example — the only published step is thirty seconds off at the mains, and the manual for your model after that.
• Samsung: turn the oven off and restart it first. If the code returns, turn off all power for thirty seconds or more at the cooker switch or the breaker, reconnect, and set the clock — Samsung confirm that an oven with an unset clock will not operate, so a reset that leaves the clock blank looks like a failed reset. If the code persists after that, contact a service centre and quote it exactly, because C-20, C-d0 and C-70 are different faults to an engineer.
• Bosch and Neff publish short power cycles and, on Bosch's UK site, no code list at all. Bosch's own instruction for an E or D message is to restart once — off and on at the oven's button, or press the clock button and reset the time — and to book if it returns; they offer exactly one attempt. Neff's E8 is a steam-function failure that you acknowledge with the clock button and carry on cooking around. The advice that matters most for this group is what not to do, below.
• Beko publish no timed reset for their ovens and their code table is banded rather than itemised. Their fix for a display that has lost its way after a clean is knob-based: turn the function and temperature knobs to zero, which is also their final step for ending a pyrolysis cycle. Their Er 81 to 85 band concerns the oven's protective systems, and Beko publish no owner remedy for it.
• Hotpoint publish no reset duration either. Their two owner-fixable codes are specific: F3E3 means the food probe is not making contact, and the fix is to let the cavity cool, unplug the probe and plug it back in firmly; F8E8 means the steam system needs descaling, and the fix is a two-pass clean — water only first, then the descaler — through to completion both times. Any other F code on a Hotpoint has no published meaning; their instruction is to read the number down the phone. Do not use the factory reset in the settings menu to clear one — Hotpoint's own wording is that all saved settings will be deleted, and it is not a fault-clearing procedure.

The one reset that makes things worse

If the door has locked after a pyrolytic clean and will not open, the instinct is to cut the power. On Neff and Bosch ovens that is the wrong move, and their published fix is the opposite of what the internet says. The lock is held on temperature and releases when the cavity has cooled; the oven needs to be powered to know that. Cutting the power wipes the clock, and an oven with an unset clock will not release the lock or cook. The fix is to set the time of day, press the button with the clock symbol, and then wait for the lock symbol to go out on its own. Only once the door is cold, the clock is set and it still will not release does Neff's own first check apply: open and close it once and look for debris or an object jammed in the seal.

Beko say the same thing in different words on the H message: do not force the handle to unlock the door until the lock symbol disappears from the display. Miele's F33 — the pyrolytic lock will not open — is one of only two codes their own manual acknowledges, and the procedure is to interrupt the clean at the oven's own controls, leave the power on at the wall and the consumer unit, and wait for the cavity to drop below 280°C, which from the end of a full cycle is not quick. No manufacturer in this corpus publishes a way to hurry a pyrolytic lock, and the cavity behind that door has been at self-cleaning temperature.

Codes a reset will not touch

Two oven codes in the corpus are rated dangerous here, and neither is a reset candidate. Miele F134 is the temperature sensor reading the cavity as too hot, and Miele give no owner remedy for it; it is the code where they withhold the ventilation check and power cycle they publish for F60, and we have not carried it across, because an oven reporting that it is too hot is not one to experiment with. Neff Er2 is a wrong mains connection, and Neff's instruction is to switch off the fuse in the fuse box and have the appliance connected correctly by an electrician. Neither is inside the oven in the sense a reset can reach. If your display shows either, isolate the oven as described above and read Is an oven fault dangerous?.

For everything else, two attempts is the limit. AEG, Miele and Neff all route to a visit the moment a code returns after one cycle, and an oven that has come back to the same message twice is telling you something a switch cannot change. If the oven simply will not heat and shows nothing, Oven not heating: what to check before you call anyone walks through the free causes in the order that finds them.

Sources

• AEG UK support: "Oven displays error code F102"; "Oven displays Demo"; "Oven displays SAFE or a padlock"; retrieved August 2026.
• Miele UK: oven fault messages F44, F60 and F134, from the Miele fault-code database and the Miele H-series operating instructions.
• Neff UK and Siemens UK troubleshooting database, oven category: "Door locked" and Er2.
• Bosch UK, Home Connect support: oven not heating; Bosch built-in oven instruction manuals, "Malfunctions" chapter, demo mode and clock setting.
• Samsung UK support: oven display messages including Pr E.
• Hotpoint UK support: DEMO mode, clock flashing, F3E3 and F8E8 articles; Hotpoint built-in oven user guides.
• Beko UK support: pyrolytic cleaning steps and the door lock indicator.
• The published meaning of each code here is on its own page, with the source it was taken from.