--- title: "True E9: the water level sensor lost its signal" description: "What E9 means on True E9: the water level sensor lost its signals, what to check before booking, and when it is not a failure at all." url: "https://icemachinerepair.center/error-codes/true-e9/" --- # True E9: the water level sensor lost its signal True reads the sump level through a small tube that carries air pressure to a sensing chip on the board. ## What E9 actually means. True reads the sump level through a small tube that carries air pressure to a sensing chip on the board. E9 points to that tube being damaged or kinked, or to the chip not seating properly, and the fill, purge and leak checks cannot work without it. True Residential ice machine display What to do when E9 shows on the ice machine ### Kind of code Sensors and bin control A sensor is telling the board something that is not true: a bin control that reads full on an empty bin, or empty while ice spills over the top, a curtain switch stuck open, a temperature sensor out of range, or an eye on a dispenser that no longer sees the cup. Scale and slime on a probe or an ultrasonic sensor cause much of it. Clearing ice piled against the bin control is a safe first step; testing and replacing a sensor is a technician's. ### Usually leads to Ice machine bin control repair The thermostat bulb, paddle, curtain switch or electronic eye that senses a full bin, adjusted or replaced so the machine stops and restarts on time. ### Shows up as Ice Machine Error Code or Flashing Light: What It Is Telling You An ice machine error code may show as a number on a small display, a pattern of blinking lights on the control board, a colored light on the front, or a machine that stops with one indicator flashing. ### Make True Residential True ice machine visits begin with the installation: the supply, the drain fall and the clearance the machine needs to cool. ### Source True Ice TCIM modular ice machine service manual (TEC_TM_198 Rev A) True Ice TCIM air-cooled modular heads (TCIM-422 to TCIM-830), touchscreen control; the code shows on the active alarm screen and stays in the alarm log. ## Before you book, in this order. Each step comes from True Residential's own guidance for E9 on its ice machines. Follow it to the end: the last card says whether this is a visit. 01 Turn the head off at the touchscreen. 02 If you can see the sensing tube from the sump without removing any panel, check it for kinks or a loose end. 03 Book a visit; the tube and the board contact are checked with the covers off and power isolated. ### Still there? It usually turns into [ice machine bin control repair](https://icemachinerepair.center/services/ice-machine-bin-control-repair/). Book with the code and the model number. ### What not to do E9 is a lost signal, not a real fill or drain problem, although it can stop both. E23, a level calculation alarm, is a different event read by a technician in the log. ## What you may notice with it. The ice machine problems E9 tends to arrive with. Answer these at the ice machine before anyone is booked. [All problems](https://icemachinerepair.center/problems/) Before you call ### [Ice Machine Error Code or Flashing Light: What It Is Telling You](https://icemachinerepair.center/problems/ice-machine-error-code/) [All 7 causes, cheapest first](https://icemachinerepair.center/problems/ice-machine-error-code/) It also comes with - [**Ice Machine Running but Not Making Ice**](https://icemachinerepair.center/problems/ice-machine-not-making-ice/) - [**Ice Machine Water Running Nonstop to the Drain**](https://icemachinerepair.center/problems/ice-machine-water-running-constantly/) Problem ### Ice Machine Error Code or Flashing Light: What It Is Telling You 7 causes, cheapest first Where E9 usually leads ## Ice machine bin control repair. **Bin thermostat, paddle, curtain switch or ice-level sensor · low.** Book a visit [What the job involves](https://icemachinerepair.center/services/ice-machine-bin-control-repair/) ## True Residential ice machines. True ice machine visits begin with the installation: the supply, the drain fall and the clearance the machine needs to cool. [True Residential ice machine repair](https://icemachinerepair.center/brands/true/) More True Residential codes [E6](https://icemachinerepair.center/error-codes/true-e6/) [E20](https://icemachinerepair.center/error-codes/true-e20/) [E14](https://icemachinerepair.center/error-codes/true-e14/) [E22](https://icemachinerepair.center/error-codes/true-e22/) [E32](https://icemachinerepair.center/error-codes/true-e32/) [E12](https://icemachinerepair.center/error-codes/true-e12/) [E24](https://icemachinerepair.center/error-codes/true-e24/) [E29](https://icemachinerepair.center/error-codes/true-e29/) [E27](https://icemachinerepair.center/error-codes/true-e27/) [E28](https://icemachinerepair.center/error-codes/true-e28/) [E25](https://icemachinerepair.center/error-codes/true-e25/) [E26](https://icemachinerepair.center/error-codes/true-e26/) [All 15 True Residential codes](https://icemachinerepair.center/error-codes/#codes-true) Sensors and bin control on other makes [Atosa E1](https://icemachinerepair.center/error-codes/atosa-e1/) [Blue Air E6](https://icemachinerepair.center/error-codes/blue-air-e6/) [Ice-O-Matic Error 2](https://icemachinerepair.center/error-codes/ice-o-matic-error-2/) [Manitowoc E12](https://icemachinerepair.center/error-codes/manitowoc-e12/) [Marvel OFF flashing](https://icemachinerepair.center/error-codes/marvel-off-flashing/) [Maxx Ice Blinking exclamation mark](https://icemachinerepair.center/error-codes/maxx-ice-exclamation-mark/) [Monogram Door alarm](https://icemachinerepair.center/error-codes/monogram-door-alarm/) [Scotsman 5](https://icemachinerepair.center/error-codes/scotsman-5/) [All 24 codes of this kind](https://icemachinerepair.center/error-codes/#family-sensor) True Residential builds this ### Modular ice machine An ice-making head set on top of a separate storage bin or drink dispenser, cooled by air, water or a condenser on the roof, turning out hundreds of pounds of cubes a day. ## In True Residential's own words > ALARM Water Level Sensor Input [True Ice TCIM modular ice machine service manual (TEC_TM_198 Rev A)](https://www.truemfg.com/wp-content/uploads/2025/08/857284-TI-TCIM-Service-Manual_Rev_A_EN.pdf) [True Ice TCIM modular ice machine service manual (TEC_TM_198 Rev A)](https://www.truemfg.com/wp-content/uploads/2025/08/857284-TI-TCIM-Service-Manual_Rev_A_EN.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. True Ice TCIM air-cooled modular heads (TCIM-422 to TCIM-830), touchscreen control; the code shows on the active alarm screen and stays in the alarm log. ## True Residential E9 ice machine 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 head off at the touchscreen. If it comes back, it needs a visit. ### How does a True ice machine know how much water is in the sump? It uses a pneumatic sensor that turns pressure from the water column into millimeters, shown on the info screen. ### Can cleaning cause E9 on my True? A tube knocked loose or pinched while parts were out can do it. Check it gently after cleaning, without opening covers over wiring. ### Will my True make ice with E9? Not reliably. The machine depends on the level reading to fill, purge and harvest. --- **[Read on the site: True E9: the water level sensor lost its signal](https://icemachinerepair.center/error-codes/true-e9/)** **[Book a visit with IceMachineRepair.center](https://icemachinerepair.center/schedule/)**