--- title: "Frymaster E13: the FQ4000 cannot trust its oil temperature probe" description: "What E13 means on Frymaster E13: the FQ4000 cannot trust its oil temperature probes, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/frymaster-e13/" --- # Frymaster E13: the FQ4000 cannot trust its oil temperature probe The FQ4000 compares the oil probe signal against the band a working probe can produce. ## What E13 actually means. The FQ4000 compares the oil probe signal against the band a working probe can produce. When the reading falls outside it, the controller logs E13 and shows TEMPERATURE PROBE FAILURE, because it can no longer regulate the heat in that vat. Frymaster lists the probe, its wiring harness or connector, and the controller itself as the possible causes. Frymaster commercial appliance display · also shown as TEMPERATURE PROBE FAILURE, E03 (M3000), PROB (CM3.5) What to do when E13 shows on the commercial appliance ### Kind of code Sensors and probes A probe is handing the controller a reading it cannot trust, or none at all: a box or coil sensor torn loose from its clip, a fryer probe coated in carbon from oil left too long between filterings, a combi core probe with a kinked cable, or a connector gone green from steam and cleaning chemicals. The unit then runs on, stops, or shuts the heat or the cooling off to protect itself. Letting it cool and restarting it as the manual describes is fair; a probe that still reads wrong sits behind a panel, and that is a visit. ### Usually leads to Commercial controls and board repair Controllers, touch panels, relays, contactors and interlocks tested, and replaced only when the evidence says so. ### Shows up as Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display A commercial appliance error code appears as letters or numbers on a combi, fryer, reach-in controller, dish machine or laundry machine display, or as a flashing light or an alarm tone. ### Make Frymaster A Frymaster fryer is serviced cold: the visit waits until the oil has come down and the vat has been drained by the crew. ### Source Frymaster FilterQuick FQG30U easyTouch gas fryer manual with FQ4000 controller (error log codes, section 5.6) FQ4000 easyTouch touchscreen controller on FilterQuick fryers (FQG30U and related FilterQuick gas and electric models). The M3000 controller on LOV fryers logs the same condition as E03 ERROR TEMP PROBE FAILURE, and the OCF manual lists TEMP PROBE FAILURE or PROB. ## Before you book, in this order. Each step comes from Frymaster's own guidance for E13 on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Turn the vat off from the controller and let the oil stand; do not try to fry on that side by watching a thermometer. 02 Note which vat shows the message and whether the other side of a split pot still reads normally, so the technician starts on the right circuit. 03 Leave the probe alone and keep hands out of the hot frypot; a technician needs to measure the probe, its harness and the controller. ### Still there? It usually turns into [commercial controls and board repair](https://commercialappliancerepair.center/services/commercial-controls-and-board-repair/). Book with the code and the model number. ### What not to do E13 is not the high-limit story: a hot vat with E16 or E17 means the oil actually got too hot, while E13 means the controller has lost its view of the oil. It is also not a low-oil warning; a fryer short of oil logs E81 instead. ## What you may notice with it. The commercial appliance problems E13 tends to arrive with. Answer these at the commercial appliance before anyone is booked. [All problems](https://commercialappliancerepair.center/problems/) Before you call ### [Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display](https://commercialappliancerepair.center/problems/commercial-error-code/) [All 8 causes, cheapest first](https://commercialappliancerepair.center/problems/commercial-error-code/) It also comes with - [**Commercial Fryer Not Heating or Slow to Recover Between Baskets**](https://commercialappliancerepair.center/problems/commercial-fryer-not-heating/) Problem ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes, cheapest first Where E13 usually leads ## Commercial controls and board repair. **Controller, touch panel, probe or sensor, relay, contactor, power supply, door switch or interlock, tested before anything is changed · moderate.** Book a visit [What the job involves](https://commercialappliancerepair.center/services/commercial-controls-and-board-repair/) ## Frymaster commercial appliances. A Frymaster fryer is serviced cold: the visit waits until the oil has come down and the vat has been drained by the crew. [Frymaster commercial appliance repair](https://commercialappliancerepair.center/brands/frymaster/) More Frymaster codes [E16](https://commercialappliancerepair.center/error-codes/frymaster-e16/) [E17](https://commercialappliancerepair.center/error-codes/frymaster-e17/) [E18](https://commercialappliancerepair.center/error-codes/frymaster-e18/) [E19](https://commercialappliancerepair.center/error-codes/frymaster-e19/) [E25](https://commercialappliancerepair.center/error-codes/frymaster-e25/) [E28](https://commercialappliancerepair.center/error-codes/frymaster-e28/) [E33](https://commercialappliancerepair.center/error-codes/frymaster-e33/) [E39](https://commercialappliancerepair.center/error-codes/frymaster-e39/) [E41](https://commercialappliancerepair.center/error-codes/frymaster-e41/) [E42](https://commercialappliancerepair.center/error-codes/frymaster-e42/) [E44](https://commercialappliancerepair.center/error-codes/frymaster-e44/) [E53](https://commercialappliancerepair.center/error-codes/frymaster-e53/) [All 15 Frymaster codes](https://commercialappliancerepair.center/error-codes/#codes-frymaster) Sensors and probes on other makes [Alto-Shaam E20](https://commercialappliancerepair.center/error-codes/alto-shaam-e20/) [Beverage-Air E01](https://commercialappliancerepair.center/error-codes/beverage-air-e01/) [Blodgett Cavity Probe Error](https://commercialappliancerepair.center/error-codes/blodgett-cavity-probe-error/) [Continental Refrigerator E0](https://commercialappliancerepair.center/error-codes/continental-refrigerator-e0/) [Delfield E01](https://commercialappliancerepair.center/error-codes/delfield-e01/) [Dexter TEMP SENSOR SHORT](https://commercialappliancerepair.center/error-codes/dexter-temp-sensor-short/) [Garland E21](https://commercialappliancerepair.center/error-codes/garland-e21/) [Hatco E1](https://commercialappliancerepair.center/error-codes/hatco-e1/) [All 62 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-sensor) Frymaster builds this ### Commercial cooking equipment Fryers, griddles, charbroilers, restaurant ranges, convection and combi ovens, steamers, kettles, holding cabinets and toasters, on gas or electric, that make up the hot side of a kitchen line. ## In Frymaster's own words > TEMP Probe reading out of range. Call service. [Frymaster FilterQuick FQG30U easyTouch gas fryer manual with FQ4000 controller (error log codes, section 5.6)](http://fm-xweb.frymaster.com/service/udocs/Manuals/8197521.pdf) [Frymaster Manual LOV M3000 controller operation manual, 02/2025 (E-log error codes)](http://fm-xweb.frymaster.com/service/udocs/Manuals/8196964.pdf) [Frymaster Oil Conserving Fryer (OCF) installation, operation and maintenance manual](http://fm-xweb.frymaster.com/service/udocs/Manuals/8196687.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. FQ4000 easyTouch touchscreen controller on FilterQuick fryers (FQG30U and related FilterQuick gas and electric models). The M3000 controller on LOV fryers logs the same condition as E03 ERROR TEMP PROBE FAILURE, and the OCF manual lists TEMP PROBE FAILURE or PROB. ## Frymaster E13 commercial appliance 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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Turn the vat off from the controller and let the oil stand; do not try to fry on that side by watching a thermometer. If it comes back, it needs a visit. ### Can I keep frying on a Frymaster that shows E13? No. Without a trusted probe reading the FQ4000 cannot hold the oil at the recipe temperature, so food quality and safety both suffer. Shut that vat down and run product on another fryer until the circuit is tested. ### Is E13 on a Frymaster always a bad probe? Not always. Frymaster names the probe, the harness and connector between probe and controller, and the controller as causes, so each one is measured before a part is ordered. ### Why does only one side of my split-pot Frymaster show E13? Each half of a split pot has its own probe and wiring. The error log records the side, so a message on one half points at that side's circuit while the other half can keep working. --- **[Read on the site: Frymaster E13: the FQ4000 cannot trust its oil temperature probe](https://commercialappliancerepair.center/error-codes/frymaster-e13/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**