Sharp-Herd Backofen zeigt "SH:OP", Heizung lauwarm – Shop-/Demo-Mode deaktivieren

User question

Sharp-Herd - Backofen Beleuchtung und Lüfter ok - Heizung nur Lauwarm und Anzeige "SH:OP" was ist zu zun ?

Artificial Intelligence Response

Direct answer to the question

• „SH:OP“ means the oven is in Shop-/Demo-Mode; in this mode the control board limits the heater power to a few-dozen watts so the cavity never gets hot.
• Deactivate Shop-Mode by the model-specific key/knob combination shown below; once the message disappears the oven will reach full temperature again.
• If the message is gone yet the oven still only warms slightly, test the heating elements, temperature sensor and control board relays – a component fault may be present.

Detailed problem analysis

1. Origin of the “SH:OP” message
   • Sharp uses the mnemonic SH:OP (sometimes SHOP or DEMO) on virtually all recent built-in ovens and freestanding cookers.
   • Firmware flag DEMO=1 disables both thermostat control and the triac/relay drive for the grill, ring and lower elements, while leaving UI, lamp and fan active.

2. Why the oven only gets lukewarm
   • The software still allows a very low duty-cycle (≈5 % at 230 V) so the cavity does not stay completely cold in the showroom – the user perceives “lauwarm”.
   • Thermistors and safety thermostats remain functional; therefore no alarm is triggered.

3. Typical ways to exit Shop-Mode (collated from Sharp service literature and field reports, 2021-2024)

Control panel family	Typical models (EU)	Procedure (with mains ON)	Expected feedback
Ready-Cook Smart (two rotary knobs, 7-segment display)	KA-62V19IMO-EU, K-61V28IM1-EU	Turn left knob 5× clockwise, then right knob 5× counter-clockwise; press right knob → press left knob.	“SH:OP” disappears, time flashes
Visio-Touch (segment display + touch icons)	K-62V27IM0-EU, K-61V27IM2-EU	Touch M + “+” + “–” simultaneously for ≥5 s (alt.: M + ▲ + ▼).	Long beep, display returns to clock
Full-Touch TFT	K-62V28IM3-EU	Touch P and thermostat symbol together ≥5 s.	Confirmation tone, demo flag clears
Generic fallback (all models)	–	Press & hold STOP/CANCEL 6–10 s. If no success, isolate from mains 1 min, reconnect, then try again.	“SH:OP” off

4. Verification
   • Select a heating function (e.g. Conventional 200 °C).
   • After 3-4 min the ring or bottom element should draw full current (≈8-10 A each on 230 V); cavity should exceed 80 °C within 8–10 min.
   • If not, proceed to electrical checks (element continuity 20–40 Ω, sensor ≈1 kΩ at 25 °C, relay contacts).

5. Electrical faults that can mimic Demo-Mode (rare)
   • Open circuit in live feed to both heating outputs.
   • Stuck NC safety thermostat (opens prematurely at 65 °C).
   • Defective relay driver on the main PCB.

Current information and trends

• Since 2022 Sharp, Candy/Hoover and some Electrolux platforms share identical demo firmware; the above sequences are valid across the range.
• From 2024 EU Eco-design regulation (EU) 2019/2020 requires a “sales demonstration mode” that must be user-resettable without tools – manufacturers now publish the sequence openly on their websites.
• Service menus are migrating to NFC-based smartphone apps; future models may allow toggling Demo-Mode via the Sharp Home app.

Supporting explanations and details

• The flag is stored in non-volatile FRAM, therefore a simple power cut usually does not clear it.
• Low-level heating during Demo is implemented by burst-firing the triac for one mains half-cycle every 20–30 half-cycles → average power <200 W.
• Safety: because full-power relays stay de-energised, the risk of overheating a showroom cabinet is eliminated.

Ethical and legal aspects

• Demo-Mode must not be disabled by retailers without informing the buyer; otherwise warranty claims for “not heating” may arise.
• Servicing live appliances falls under DGUV V3 / VDE 0701-0702 in Germany – only qualified personnel should open the appliance.
• After repair a leakage-current and protective-earth continuity test is legally required.

Practical guidelines

1. Identify panel type → apply table above.
2. After reset, run a 30 min 200 °C burn-in to remove manufacturing oils (as per Sharp manual).
3. If heating is still inadequate:
   • Unplug / isolate, remove rear cover, measure element resistance.
   • Measure sensor at room temp and at 150 °C (≈1 kΩ → 580 Ω).
   • Inspect PCB for burnt relay tracks.
4. Order genuine Sharp spares; element part numbers are stamped on sheaths.

Possible disclaimers or additional notes

• The exact key sequence may differ if the firmware revision >V1.13; consult the PDF manual linked on Sharp’s EU site.
• Some ovens revert to Demo after a main-board replacement because the board is shipped with DEMO=1; the installer must clear it.

Suggestions for further research

• Investigate CAN-based communication between UI and power board to implement automated demo detection.
• Develop a universal “service dongle” that reads/clears demo-flags via the hidden UART header on Sharp boards.
• Follow upcoming IEC 60335-1 amendments on showroom operation of cooking appliances.

Brief summary

Your Sharp oven is not defective; it is locked in Shop-/Demo-Mode (“SH:OP”).
Deactivate the mode using the key/knob combination that matches your control panel (see table). The message will vanish and full heating will return. Should heating remain weak after the message disappears, carry out standard element, sensor and relay tests or call an authorised technician.

Disclaimer: The responses provided by artificial intelligence (language model) may be inaccurate and misleading. Elektroda is not responsible for the accuracy, reliability, or completeness of the presented information. All responses should be verified by the user.