--- title: "True E20: high pressure on the HP1 sensor" description: "What E20 means on True E20: high pressure on the HP1 sensors, what to check before booking, and when it is not a failure at all." url: "https://icemachinerepair.center/error-codes/true-e20/" --- # True E20: high pressure on the HP1 sensor True sets a high-pressure limit for each model between 320 and 360 psi on the HP1 transducer. ## What E20 actually means. True sets a high-pressure limit for each model between 320 and 360 psi on the HP1 transducer. When the reading crosses it, E20 is logged; the causes are the same airflow problems that raise E6, and True's first steps are the air filter, the coil and the condenser fan. True Residential ice machine display What to do when E20 shows on the ice machine ### Kind of code Condenser and airflow The machine could not shed its heat. An air filter packed with lint, a condenser coil furred with grease and dust, a fan motor that no longer spins, a machine pushed into a hot corner without its clearance, a water-cooled condenser whose regulating valve starves it, or a remote condenser on a roof blocked by leaves all show up here. Washing the air filter and freeing the space around the machine clears many cases; a fan motor or a valve means a visit. ### Usually leads to Ice machine condenser and fan repair Air-cooled coils, fan motors and filters, water-cooled regulating valves and rooftop remote condensers, cleaned or repaired so the ice machine can shed its heat. ### 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 E20 on its ice machines. Follow it to the end: the last card says whether this is a visit. 01 Check the air filter and wash it if it is dusty. 02 Make sure the space around the head has not been closed in by new shelving or stored goods. 03 If E20 returns after the filter is clean and the fan runs, book a visit so the coil and the transducer reading can be checked with gauges. ### Still there? It usually turns into [ice machine condenser and fan repair](https://icemachinerepair.center/services/ice-machine-condenser-and-fan-repair/). Book with the code and the model number. ### What not to do E20 is not a signal loss from the transducer; that is E7. It also differs from E6, which uses the fixed 370 psi discharge limit rather than the model-specific HP1 limit. ## What you may notice with it. The ice machine problems E20 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 Making Too Little Ice for the Rush**](https://icemachinerepair.center/problems/ice-machine-making-little-ice/) - [**Ice Machine Running but Not Making Ice**](https://icemachinerepair.center/problems/ice-machine-not-making-ice/) Problem ### Ice Machine Error Code or Flashing Light: What It Is Telling You 7 causes, cheapest first Where E20 usually leads ## Ice machine condenser and fan repair. **Condenser cleaning, fan motor, water regulating valve or remote condenser work · low to moderate.** Book a visit [What the job involves](https://icemachinerepair.center/services/ice-machine-condenser-and-fan-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/) [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/) [E31](https://icemachinerepair.center/error-codes/true-e31/) [All 15 True Residential codes](https://icemachinerepair.center/error-codes/#codes-true) Condenser and airflow on other makes [Atosa E4](https://icemachinerepair.center/error-codes/atosa-e4/) [Blue Air E02](https://icemachinerepair.center/error-codes/blue-air-e02/) [Follett HI PRESSURE](https://icemachinerepair.center/error-codes/follett-hi-pressure/) [Hoshizaki 4 beeps](https://icemachinerepair.center/error-codes/hoshizaki-4-beeps/) [Manitowoc E04](https://icemachinerepair.center/error-codes/manitowoc-e04/) [Scotsman 4](https://icemachinerepair.center/error-codes/scotsman-4/) [All 9 codes of this kind](https://icemachinerepair.center/error-codes/#family-condenser) 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 High Pressure on HP1 [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 E20 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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Check the air filter and wash it if it is dusty. If it comes back, it needs a visit. ### What is HP1 on a True ice machine? It is the primary high-side pressure transducer, the sensor that reports condenser pressure to the control board. A second one, HP2, has its own alarm, E33. ### Why does my True show E20 but not E6? The HP1 limit can be lower than 370 psi, depending on the model, so E20 can trip first. Both point to heat not leaving the condenser. ### Does reversing the fan with the RCU key help with E20? The RCU key reverses the condenser fans to blow dust out of the coil, and True puts it on the main screen for that reason. It helps with light dust, not with grease or a failed fan. --- **[Read on the site: True E20: high pressure on the HP1 sensor](https://icemachinerepair.center/error-codes/true-e20/)** **[Book a visit with IceMachineRepair.center](https://icemachinerepair.center/schedule/)**