--- title: "True P2: the Dixell coil probe has failed" description: "What P2 means on True P2: the Dixell coil probe has faileds, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/true-p2/" --- # True P2: the Dixell coil probe has failed Probe 2 on True's Dixell units is the defrost probe clipped to the evaporator coil. ## What P2 actually means. Probe 2 on True's Dixell units is the defrost probe clipped to the evaporator coil. The control uses it to end defrost and to manage the fans after defrost. With P2 showing, defrost falls back on timing, so ice can build on the coil over the following days. True Residential commercial appliance display What to do when P2 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), which names p2 as the defrost (coil) probe. ## Before you book, in this order. Each step comes from True Residential's own guidance for P2 on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Write down when P2 appeared and keep checking food temperatures on your log. 02 Look at the coil area through the grille for heavy white frost; if it is building, the unit may need a manual defrost soon. 03 Book a visit so the probe can be measured before the coil ices over. ### 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 P2 is not the thermostat probe; P1 is. A cabinet with P2 often still holds temperature for a while, which is why it gets ignored until the coil freezes. ## What you may notice with it. The commercial appliance problems P2 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 - [**Walk-In Freezer Icing Up on the Coil, Floor and Door Frame**](https://commercialappliancerepair.center/problems/walk-in-freezer-icing-up/) - [**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 P2 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/) [P1](https://commercialappliancerepair.center/error-codes/true-p1/) [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 > P2 Evaporator 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), which names p2 as the defrost (coil) probe. ## True Residential P2 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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Write down when P2 appeared and keep checking food temperatures on your log. If it comes back, it needs a visit. ### Why is my True still cold with P2 showing? The thermostat probe still controls the compressor, so the cabinet can hold for a while. Defrost is what suffers, and frost builds slowly on the coil. ### Can I ignore P2 on a True until the next PM visit? Not for long. An iced coil stops air moving, and then the cabinet warms quickly. ### Is P3 the same as P2 on a True? No. True's guide lists P3 as the auxiliary probe, used on some units for the display reading. --- **[Read on the site: True P2: the Dixell coil probe has failed](https://commercialappliancerepair.center/error-codes/true-p2/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**