--- title: "True Con: the Danfoss control flags the condenser" description: "What Con means on True Con: the Danfoss control flags the condensers, what to check before booking, and when it is not a failure at all." url: "https://commercialappliancerepair.center/error-codes/true-con/" --- # True Con: the Danfoss control flags the condenser True lists Con as the condenser alarm on its Danfoss ERC controls. ## What Con actually means. True lists Con as the condenser alarm on its Danfoss ERC controls. The condenser is the coil that sheds heat, usually behind the front grille or under the unit, and dust or grease on it is the most common reason it runs hot. True's own guide ties a dirty condenser to frozen evaporator coils and to system failure. True Residential commercial appliance display What to do when Con shows on the commercial appliance ### Kind of code Compressor and cooling The unit is running but not moving heat out of the box the way it should. On a walk-in that is often a condensing unit on the roof choking on cottonwood or grease, a condenser fan that stopped, an evaporator fan or defrost heater that failed so the coil iced solid, or a slow refrigerant leak; a reach-in adds a door gasket or heater that lets warm air in. Cleaning the condenser face with the power off and checking that the doors close are fair first steps; the refrigerant circuit, the compressor and every line stay with a technician. ### Usually leads to Walk-in cooler repair Walk-in coolers and freezers back to temperature: evaporators, fans, defrost, drain heaters, condensing units and doors. ### 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 for Danfoss ERC controls in True's general control guide (rev. C, 2025). The no-display Danfoss version signals the same alarm as one flash then three flashes of its LED. ## Before you book, in this order. Each step comes from True Residential's own guidance for Con on its commercial appliances. Follow it to the end: the last card says whether this is a visit. 01 Unplug the unit, then look at the condenser fins for a mat of dust or grease. 02 Brush or vacuum loose dust off the fins in the direction they run; leave greasy coils to a technician. 03 Clear boxes and bags away from the grille so air can move, then plug the unit back in. 04 If Con returns within a day or two of cleaning, book a visit. ### Still there? It usually turns into [walk-in cooler repair](https://commercialappliancerepair.center/services/walk-in-cooler-repair/). Book with the code and the model number. ### What not to do Con is not a refrigerant leak alarm; that is LEA. It also does not mean the compressor has failed, although a condenser left dirty long enough shortens its life. ## What you may notice with it. The commercial appliance problems Con 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/) - [**Prep Table Running Warm in the Top Rail and the Base**](https://commercialappliancerepair.center/problems/prep-table-running-warm/) Problem ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes, cheapest first Where Con usually leads ## Walk-in cooler repair. **Walk-in evaporator fan, defrost heater or drain line heater, door gasket, frame heater, expansion valve, leak repair, compressor or condensing unit · moderate to highest.** Book a visit [What the job involves](https://commercialappliancerepair.center/services/walk-in-cooler-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/) [P2](https://commercialappliancerepair.center/error-codes/true-p2/) [E01](https://commercialappliancerepair.center/error-codes/true-e01/) [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) Compressor and cooling on other makes [Beverage-Air LEA](https://commercialappliancerepair.center/error-codes/beverage-air-lea/) [Delfield LEA](https://commercialappliancerepair.center/error-codes/delfield-lea/) [Hoshizaki E3](https://commercialappliancerepair.center/error-codes/hoshizaki-e3/) [Randell CON](https://commercialappliancerepair.center/error-codes/randell-con/) [Traulsen CLN FIL](https://commercialappliancerepair.center/error-codes/traulsen-cln-fil/) [Turbo Air C1](https://commercialappliancerepair.center/error-codes/turbo-air-c1/) [Victory CHt](https://commercialappliancerepair.center/error-codes/victory-cht/) [All 15 codes of this kind](https://commercialappliancerepair.center/error-codes/#family-cooling) 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 > Con Condenser alarm [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 for Danfoss ERC controls in True's general control guide (rev. C, 2025). The no-display Danfoss version signals the same alarm as one flash then three flashes of its LED. ## True Residential Con 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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Unplug the unit, then look at the condenser fins for a mat of dust or grease. If it comes back, it needs a visit. ### How often should the condenser on a True be cleaned? True points to its installation manual for the schedule. In a kitchen with fryers or flour in the air, monthly checks are sensible. ### Why does my True show Con in summer only? A hot kitchen and a partly dirty coil together push the condenser past its limit. Cleaning the coil and giving the unit room to breathe usually cures a seasonal Con. ### Can I keep using a True with Con on the display? Usually yes for a short time, but watch the food temperature. A condenser that cannot shed heat makes the cabinet warm and works the compressor hard. --- **[Read on the site: True Con: the Danfoss control flags the condenser](https://commercialappliancerepair.center/error-codes/true-con/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**