--- title: "Sharp Er05: the thermostat circuit reads open" description: "What Er05 means on Sharp Er05: the thermostat circuit reads opens, what to check before booking, and when it is not a failure at all." url: "https://microwaverepair.center/error-codes/sharp-er05/" --- # Sharp Er05: the thermostat circuit reads open Sharp describes Er05 as the thermostats being under open-circuit protection. ## What Er05 actually means. Sharp describes Er05 as the thermostats being under open-circuit protection. The control cannot get a reading through the thermostat circuit, so it stops and alerts until STOP/CLEAR is pressed or the microwave is unplugged. Sharp microwave display What to do when Er05 shows on the microwave ### Kind of code Sensors and temperature The control has stopped trusting what one of its sensors reports: the cook or humidity sensor that ends a sensor reheat when steam rises, or a thermal cutout that trips when the cavity or the magnetron runs too hot. A cutout that opens stops the microwave mid-cycle and often recovers once it cools; one that keeps tripping, or a sensor program that shuts off at once every time, needs the sensor, its wiring or the airflow behind it checked. ### Usually leads to Microwave control board and touchpad repair Tracing a dead display, keys that do not answer or a code that keeps returning to the keypad, the ribbon, the relays or the main board, and replacing only the part that failed. ### Shows up as What a Microwave Error Code Is Telling You A microwave error code may be a letter and a number on the display, a lock or demo word, a row of dashes, or a beep with a blinking clock, and it can show while the microwave still heats or block every key until it is cleared. ### Make Sharp Sharp microwaves repaired in the kitchen, including drawer models under the counter, countertop units and those mounted over the burners. ### Source Sharp USA support article table image: Automatic Protection Mechanism (SMC0985KS) Shown in Sharp's SMC0985KS error-code article; other Sharp microwaves checked do not use it. ## Before you book, in this order. Each step comes from Sharp's own guidance for Er05 on its microwaves. Follow it to the end: the last card says whether this is a visit. 01 Press STOP/CLEAR and unplug the microwave for a minute. 02 Plug it back in and try a short run. 03 If Er05 comes back, stop using it and book a visit; the thermostat and its wiring are inside the cabinet. ### Still there? It usually turns into [microwave control board and touchpad repair](https://microwaverepair.center/services/microwave-control-board-and-touchpad-repair/). Book with the code and the model number. ### What not to do Er05 is not caused by what you cooked. It is a circuit reading, the open counterpart of Er06. ## What you may notice with it. The microwave problems Er05 tends to arrive with. Answer these at the microwave before anyone is booked. [All problems](https://microwaverepair.center/problems/) Before you call ### [What a Microwave Error Code Is Telling You](https://microwaverepair.center/problems/microwave-error-code/) [All 7 causes, cheapest first](https://microwaverepair.center/problems/microwave-error-code/) It also comes with - [**Microwave Runs but Food Stays Cold**](https://microwaverepair.center/problems/microwave-not-heating/) - [**Microwave Shuts Off Before the Timer Ends**](https://microwaverepair.center/problems/microwave-stops-mid-cycle/) Problem ### What a Microwave Error Code Is Telling You 7 causes, cheapest first Where Er05 usually leads ## Microwave control board and touchpad repair. **Control board, keypad membrane or display · moderate to highest.** Book a visit [What the job involves](https://microwaverepair.center/services/microwave-control-board-and-touchpad-repair/) ## Sharp microwaves. Sharp microwaves repaired in the kitchen, including drawer models under the counter, countertop units and those mounted over the burners. [Sharp microwave repair](https://microwaverepair.center/brands/sharp/) More Sharp codes [Er03](https://microwaverepair.center/error-codes/sharp-er03/) [Er04](https://microwaverepair.center/error-codes/sharp-er04/) [Er06](https://microwaverepair.center/error-codes/sharp-er06/) [ERROR](https://microwaverepair.center/error-codes/sharp-error/) [LOCK ON](https://microwaverepair.center/error-codes/sharp-lock-on/) [DEMO ON](https://microwaverepair.center/error-codes/sharp-demo-on/) [DOOR LOCK ON](https://microwaverepair.center/error-codes/sharp-door-lock-on/) [ENJOY YOUR MICROWAVE](https://microwaverepair.center/error-codes/sharp-enjoy-your-microwave/) Sensors and temperature on other makes [Bertazzoni ERROR](https://microwaverepair.center/error-codes/bertazzoni-error/) [Bosch ERROR](https://microwaverepair.center/error-codes/bosch-error/) [Café HOT](https://microwaverepair.center/error-codes/cafe-hot/) [Dacor C-10](https://microwaverepair.center/error-codes/dacor-c-10/) [Fisher & Paykel A1](https://microwaverepair.center/error-codes/fisher-and-paykel-a1/) [Fulgor Milano ERROR](https://microwaverepair.center/error-codes/fulgor-milano-error/) [GE Profile ERR](https://microwaverepair.center/error-codes/ge-profile-err/) [JennAir E11](https://microwaverepair.center/error-codes/jennair-e11/) [All 42 codes of this kind](https://microwaverepair.center/error-codes/#family-sensor) Sharp builds this ### Microwave hood combination The microwave that hangs from the wall cabinets above the burners, heating food in its cavity while its own fan, light and filters handle the steam and grease rising from the pans beneath it. Sharp builds this ### Built-in microwave A microwave set into a tall cabinet or a wall of cabinetry at eye level, either a countertop body wrapped in a trim kit or a true built-in model, including speed and convection microwaves that brown as well as heat. Sharp builds this ### Microwave drawer A microwave built under a counter or into a kitchen island that opens like a drawer at the touch of a key, with a motor and gears sliding its cavity out toward you. ## In Sharp's own words > The display may show Er05, which means the appliance's thermostats are under open circuit protection mode. [Sharp USA support article table image: Automatic Protection Mechanism (SMC0985KS)](https://support.sharpusa.com/servlet/rtaImage?eid=ka0UV000000OvwP&feoid=00NHp00000kcRRY&refid=0EMUV00000AU5vl) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Shown in Sharp's SMC0985KS error-code article; other Sharp microwaves checked do not use it. ## Sharp Er05 microwave repair, where we come out. The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered. 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Press STOP/CLEAR and unplug the microwave for a minute. If it comes back, it needs a visit. ### Can I fix Er05 on my Sharp microwave myself? Only the power reset. The thermostat sits behind the cabinet panels, which an owner should never open. ### What is the difference between Er05 and Er06 on a Sharp? Er05 is an open thermostat circuit; Er06 is a shorted one. Both stop the microwave to protect it. ### Is a Sharp SMC0985KS with Er05 worth repairing? It depends on age and the part found; after testing, a compact countertop unit is sometimes better replaced. --- **[Read on the site: Sharp Er05: the thermostat circuit reads open](https://microwaverepair.center/error-codes/sharp-er05/)** **[Book a visit with MicrowaveRepair.center](https://microwaverepair.center/schedule/)**