--- title: "UniMac E ro: the rotation sensor signal is invalid" description: "What E ro means on UniMac E ro: the rotation sensor signal is invalids, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/unimac-e-ro/" --- # UniMac E ro: the rotation sensor signal is invalid When the rotation sensor signal goes bad, a UniMac does not stop mid-load. ## What E ro actually means. When the rotation sensor signal goes bad, a UniMac does not stop mid-load. It switches to fixed coast times to finish the cycle safely, then shows E ro so the owner knows the sensor needs attention. UniMac commercial appliance display · also shown as E rO What to do when E ro 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 UniMac UniMac equipment in a facility laundry room is usually serviced after the heaviest morning loads are out. ### Source UniMac UW-series washer-extractor control manual F8552201R2 (Alliance Laundry Systems, 2017) UniMac UW-series hardmount extractors of 45 to 130 lb (UWH, UWL, UWN and UWU models) with the keypad control in manual F8552201. Current UW models sold with UniLinc Touch show plain-word messages instead of these codes. ## Before you book, in this order. Each step comes from UniMac's own guidance for E ro on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Let the cycle finish on its own coast timing. 02 Wait until the cylinder has fully stopped before opening the door. 03 Book a visit to check the rotation sensor and its connections. ### 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 E ro does not mean the motor failed; the cylinder still turns. It also differs from the Ed codes, which come from the motor drive itself. ## What you may notice with it. The commercial appliance problem E ro 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/) Problem ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes, cheapest first Where E ro 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/) ## UniMac commercial appliances. UniMac equipment in a facility laundry room is usually serviced after the heaviest morning loads are out. [UniMac commercial appliance repair](https://commercialappliancerepair.center/brands/unimac/) More UniMac codes [E FL](https://commercialappliancerepair.center/error-codes/unimac-e-fl/) [E dr](https://commercialappliancerepair.center/error-codes/unimac-e-dr/) [E dL](https://commercialappliancerepair.center/error-codes/unimac-e-dl/) [E do](https://commercialappliancerepair.center/error-codes/unimac-e-do/) [E Ub](https://commercialappliancerepair.center/error-codes/unimac-e-ub/) [E Ht](https://commercialappliancerepair.center/error-codes/unimac-e-ht/) [E oP](https://commercialappliancerepair.center/error-codes/unimac-e-op/) [E SH](https://commercialappliancerepair.center/error-codes/unimac-e-sh/) [E FS](https://commercialappliancerepair.center/error-codes/unimac-e-fs/) [E Ld](https://commercialappliancerepair.center/error-codes/unimac-e-ld/) [E LF](https://commercialappliancerepair.center/error-codes/unimac-e-lf/) [ESd](https://commercialappliancerepair.center/error-codes/unimac-esd/) [All 15 UniMac codes](https://commercialappliancerepair.center/error-codes/#codes-unimac) 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/) [Frymaster E13](https://commercialappliancerepair.center/error-codes/frymaster-e13/) [Garland E21](https://commercialappliancerepair.center/error-codes/garland-e21/) [All 59 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-sensor) UniMac builds this ### Commercial laundry equipment Coin, card and app-paid front-load machines, washer-extractors, stacked units and tumble dryers in laundromats, multi-housing laundry rooms, hotels, gyms and on-premise laundries. ## In UniMac's own words > Invalid signal received from Rotation Sensor. Control will activate coast times to complete cycle. [UniMac UW-series washer-extractor control manual F8552201R2 (Alliance Laundry Systems, 2017)](http://docs.alliancelaundry.com/tech_pdf/Production/F8552201.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. UniMac UW-series hardmount extractors of 45 to 130 lb (UWH, UWL, UWN and UWU models) with the keypad control in manual F8552201. Current UW models sold with UniLinc Touch show plain-word messages instead of these codes. ## UniMac E ro 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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Let the cycle finish on its own coast timing. If it comes back, it needs a visit. ### Can I keep using a UniMac that shows E ro? It will finish cycles on coast timing, but without speed feedback it cannot manage extract as well. Plan a repair soon. ### Does E ro stop the cycle on a UniMac? No. The control switches to fixed coast times so the load can finish, then shows the code. ### Is E ro a sensor or a board problem on a UniMac? Usually the sensor or its harness; the board is checked only after those. --- **[Read on the site: UniMac E ro: the rotation sensor signal is invalid](https://commercialappliancerepair.center/error-codes/unimac-e-ro/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**