--- title: "True P1: the Dixell thermostat probe has stopped reading" description: "What P1 means on True P1: the Dixell thermostat probe has stopped readings, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/true-p1/" --- # True P1: the Dixell thermostat probe has stopped reading On True units with a Dixell control, probe 1 is the thermostat probe that sits in the return air and decides when the compressor runs. ## What P1 actually means. On True units with a Dixell control, probe 1 is the thermostat probe that sits in the return air and decides when the compressor runs. When the control reads it as open or shorted it shows P1. Without that probe the control cannot hold the set temperature properly. True Residential commercial appliance display What to do when P1 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 True Residential A True cooler or prep station in a restaurant is looked at once the kitchen confirms where the held food is sitting for now. ### Source True Commercial Refrigeration General Control Guide, P#811072, rev. C (09/2025) Listed in the Dixell display code table of True's general control guide (rev. C, 2025); the same guide names p1 as the thermostat (return air) probe. ## Before you book, in this order. Each step comes from True Residential's own guidance for P1 on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Check the food temperature with a separate thermometer right away and log it. 02 If the cabinet is warming, move food that must stay at 41°F or below to another unit. 03 Do not unplug and replug repeatedly; note the time P1 appeared and book a visit. ### 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 P1 is not a warm alarm, though a warm cabinet may follow. P2 is the coil probe, which mostly affects defrost. ## What you may notice with it. The commercial appliance problems P1 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 - [**Reach-In Cooler Not Holding Temperature Through a Shift**](https://commercialappliancerepair.center/problems/reach-in-not-holding-temperature/) Problem ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes, cheapest first Where P1 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/) ## True Residential commercial appliances. A True cooler or prep station in a restaurant is looked at once the kitchen confirms where the held food is sitting for now. [True Residential commercial appliance repair](https://commercialappliancerepair.center/brands/true/) More True Residential codes [HI](https://commercialappliancerepair.center/error-codes/true-hi/) [LO](https://commercialappliancerepair.center/error-codes/true-lo/) [dOr](https://commercialappliancerepair.center/error-codes/true-dor/) [dEF](https://commercialappliancerepair.center/error-codes/true-def/) [HA](https://commercialappliancerepair.center/error-codes/true-ha/) [P2](https://commercialappliancerepair.center/error-codes/true-p2/) [E01](https://commercialappliancerepair.center/error-codes/true-e01/) [Con](https://commercialappliancerepair.center/error-codes/true-con/) [LEA](https://commercialappliancerepair.center/error-codes/true-lea/) [uLi](https://commercialappliancerepair.center/error-codes/true-uli/) [EoC](https://commercialappliancerepair.center/error-codes/true-eoc/) [EE](https://commercialappliancerepair.center/error-codes/true-ee/) [All 14 True Residential codes](https://commercialappliancerepair.center/error-codes/#codes-true) 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 60 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-sensor) True Residential builds this ### Commercial cold storage Reach-in and pass-through cabinets, walk-in coolers and walk-in freezers, prep and sandwich tables, undercounter units and blast chillers that hold a kitchen's food at safe temperatures. True Residential 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 True Residential's own words > P1 Thermostat probe failure [True Commercial Refrigeration General Control Guide, P#811072, rev. C (09/2025)](https://www.truemfg.com/wp-content/uploads/2025/09/811072_Commercial-Refrigeration-General-Control-Guide_REV_C_EN.pdf) [True Commercial Refrigeration General Control Guide, P#811072, rev. C (09/2025)](https://www.truemfg.com/wp-content/uploads/2025/09/811072_Commercial-Refrigeration-General-Control-Guide_REV_C_EN.pdf) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Listed in the Dixell display code table of True's general control guide (rev. C, 2025); the same guide names p1 as the thermostat (return air) probe. ## True Residential P1 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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Check the food temperature with a separate thermometer right away and log it. If it comes back, it needs a visit. ### Can a True keep cooling with P1 on the display? It depends on how the control is set to behave without that probe, and the cabinet may run warm or cold. Treat the display as unreliable and trust a separate thermometer until the probe is checked. ### How does a technician test the True P1 probe? True's guide has the probe disconnected and its resistance measured against a chart, including a check in a cup of ice water. A reading off the chart means a new probe. ### Is P1 on my True caused by the control board? Usually the probe or its wire is the cause, but the connection at the control is checked too before parts are ordered. --- **[Read on the site: True P1: the Dixell thermostat probe has stopped reading](https://commercialappliancerepair.center/error-codes/true-p1/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**