Turbo Air Reach-ins: what does "E1 (varies by controller)" mean?

Turbo Air Reach-ins code E1 (varies by controller) means: Depends entirely on which controller is fitted, and published sources contradict each other. Common causes include on a danfoss ekc controller turbo air's own manual gives e1 as a fault in the controller itself. two widely circulated third-party lists instead give e1 as a cabinet temperature sensor fault. a third source, for turbo air's air conditioning line rather than refrigeration, gives e1 as an indoor to outdoor communication fault. these cannot all be true of the same machine.

Turbo Air Reach-ins: what does "E2 (varies by controller)" mean?

Turbo Air Reach-ins code E2 (varies by controller) means: The clearest example of the contradiction, and worth checking carefully. Common causes include one published third-party list gives e2 as an evaporator coil sensor fault. another gives e2 as an evaporator fan or motor failure. those are different parts, different costs and different diagnoses, and both are presented as fact.

Turbo Air Reach-ins: what does "A1 (Danfoss EKC controller)" mean?

Turbo Air Reach-ins code A1 (Danfoss EKC controller) means: HIGH TEMPERATURE alarm. Corrected: this is not the door alarm. Common causes include danfoss's own ekc 202 documentation lists a1 as the high temperature alarm and a2 as low temperature. the door alarm is a4. this table previously gave a1 as the door alarm, which is wrong and is corrected here, because the two send a technician to completely different places: a warm box versus a switch and a gasket. cabinet temperature has risen above the alarm limit and stayed there past the delay.

Turbo Air Reach-ins: what does "A61 (Danfoss EKC controller)" mean?

Turbo Air Reach-ins code A61 (Danfoss EKC controller) means: Condenser temperature alarm. Common causes include dirty condenser, restricted airflow, or high ambient.

Turbo Air Reach-ins: what does "E27, E29, E30 (Danfoss EKC controller)" mean?

Turbo Air Reach-ins code E27, E29, E30 (Danfoss EKC controller) means: Sensor errors on specific inputs: S5, Sair and Saux respectively. Common causes include failed probe or damaged wiring on the named input.

Turbo Air Reach-ins: what does "F1 and D1 (older TSR-series controllers)" mean?

Turbo Air Reach-ins code F1 and D1 (older TSR-series controllers) means: F-sensor and D-sensor malfunction respectively. Common causes include short circuit or disconnected wiring at the named sensor.

Turbo Air Reach-ins: what does "Cabinet warm, no code shown" mean?

Turbo Air Reach-ins code Cabinet warm, no code shown means: Mechanical or dial-controlled cabinets show nothing at all. Common causes include some turbo air units use a mechanical or digital ranco thermostat rather than an electronic controller, and report nothing.

Turbo Air Reach-ins: what does "E1 showing constantly on a Ranco-thermostat cabinet" mean?

Turbo Air Reach-ins code E1 showing constantly on a Ranco-thermostat cabinet means: Reported by technicians as a controller failure on that specific control. Common causes include failed digital ranco thermostat.

Turbo Air Reach-ins: what does "A2 (Danfoss EKC controller)" mean?

Turbo Air Reach-ins code A2 (Danfoss EKC controller) means: Low temperature alarm. Common causes include cabinet colder than its low alarm limit. less urgent than a high alarm and easier to ignore, but it freezes product that should not be frozen and usually means a setpoint or a sensor rather than a refrigeration fault.

Turbo Air Reach-ins: what does "A4 (Danfoss EKC controller)" mean?

Turbo Air Reach-ins code A4 (Danfoss EKC controller) means: Door alarm. This is the code our table previously attributed to A1. Common causes include danfoss's own list gives a4 as the door alarm, triggered from the door input. door left open, a failed door switch, or a gasket or hinge holding the door off its seal.

Turbo Air Reach-ins: what does "A45, A59 (Danfoss EKC controller)" mean?

Turbo Air Reach-ins code A45, A59 (Danfoss EKC controller) means: NOT FAULTS: standby and case cleaning. Common causes include a45 means refrigeration has been stopped deliberately, via the r12 parameter or a digital input, and a59 means case cleaning mode is signalled from a di input. both look like alarms and both mean somebody switched the cooling off on purpose. a cabinet warming with a45 showing has not failed, it has been told to stop.

Turbo Air Reach-ins: what does "E6 (Danfoss EKC controller)" mean?

Turbo Air Reach-ins code E6 (Danfoss EKC controller) means: Fault in the real-time clock. Common causes include danfoss's remedy is to check the battery and reset the clock. harmless in itself, and not harmless in effect: a controller with a lost clock cannot run scheduled defrosts correctly, so this often precedes an icing complaint.

Turbo Air Reach-ins Error Codes

Applies to: Reach-ins and Merchandisers. Compiled from Turbo Air's own documentation, including the Smart 7 installation and operation manual which documents the Danfoss EKC alarm set, and the TSR-23SD service manual which documents a different F and D code table. THE DANFOSS ROWS ARE NOW ANCHORED TO DANFOSS'S OWN EKC 202 USER GUIDES published on assets.danfoss.com, on the reasoning that the controller's maker is a manufacturer in its own right and is the authority on its own codes. That produced a correction: this table previously gave A1 as the door alarm. Danfoss lists A1 as high temperature, A2 as low temperature and A4 as the door alarm, and the error is recorded here rather than quietly fixed because it sent readers toward a switch and a gasket when the machine was reporting a warm box. Field diagnostic figures are attributed where they come from practitioners rather than from Turbo Air or Danfoss. Where sources conflict, this page says so rather than choosing one. Table last updated Aug 16, 2026.

How to read the codes

THERE IS NO SINGLE ANSWER TO WHAT E1 MEANS ON A TURBO AIR, and that is the most useful thing on this page. Turbo Air fits several different controllers across its range and they do not share a code set: some cabinets use a Danfoss EKC controller with A-alarms and E-codes, some use an ASCON controller, some use a digital Ranco thermostat, some are mechanical with no codes at all, and older models use an F and D code set with no E codes whatsoever. IDENTIFY THE CONTROLLER FIRST, by photographing the control face, before matching any code from any source including this one.

The codes

Code	Meaning	Likely causes	Operator-safe steps	Technician work
E1 (varies by controller)	Depends entirely on which controller is fitted, and published sources contradict each other	On a Danfoss EKC controller Turbo Air's own manual gives E1 as a fault in the CONTROLLER itself. Two widely circulated third-party lists instead give E1 as a cabinet temperature sensor fault. A third source, for Turbo Air's air conditioning line rather than refrigeration, gives E1 as an indoor to outdoor communication fault. These cannot all be true of the same machine	Do not act on a code meaning found online without matching your controller. Photograph the control face before you call, because that photograph is what lets a technician tell you which list applies	Technicians on refrigeration forums report a practical test on ASCON-controlled cabinets: unplug the unit and measure across controller terminals 9 and 10 on a refrigerator, or 9 and 11 on a freezer. Below about 9k ohms indicates a failed sensor; above it indicates the controller. That figure is field-reported rather than published by Turbo Air, and is recorded here as such
E2 (varies by controller)	The clearest example of the contradiction, and worth checking carefully	One published third-party list gives E2 as an evaporator coil SENSOR fault. Another gives E2 as an evaporator FAN or motor failure. Those are different parts, different costs and different diagnoses, and both are presented as fact	If somebody has quoted you a repair based on an E2 meaning from a website, it is fair to ask which controller they identified and where the meaning came from	Same terminal test as E1, using 9 and 11. Verify against the actual controller rather than a brand-level list
A1 (Danfoss EKC controller)	HIGH TEMPERATURE alarm. Corrected: this is not the door alarm	Danfoss's own EKC 202 documentation lists A1 as the high temperature alarm and A2 as low temperature. THE DOOR ALARM IS A4. This table previously gave A1 as the door alarm, which is wrong and is corrected here, because the two send a technician to completely different places: a warm box versus a switch and a gasket. Cabinet temperature has risen above the alarm limit and stayed there past the delay	Check the load, the door seal and the condenser before calling. A high temperature alarm after a big delivery is often the cabinet doing its job	Thermostat limits, sensor placement, condenser condition and refrigerant charge
A61 (Danfoss EKC controller)	Condenser temperature alarm	Dirty condenser, restricted airflow, or high ambient	This is the one an operator can often prevent entirely. Check the condenser is clean and nothing is stacked against the airflow	Condenser condition, fan operation, ambient temperature and clearances
E27, E29, E30 (Danfoss EKC controller)	Sensor errors on specific inputs: S5, Sair and Saux respectively	Failed probe or damaged wiring on the named input	Check product temperatures with a separate thermometer until it is fixed, because the cabinet cannot control accurately on a failed probe	Turbo Air's manual notes the alarm behaviour: E-alarms appear the moment the error occurs, while A-alarms wait for their configured delay, and an A-alarm will not display while an E-alarm is active
F1 and D1 (older TSR-series controllers)	F-sensor and D-sensor malfunction respectively	Short circuit or disconnected wiring at the named sensor	Worth knowing these cabinets exist: if your Turbo Air shows an F or D code rather than an E code, none of the E-code lists online apply to it at all	Turbo Air's TSR-23SD service manual carries this table, with C1 for cycle and compressor malfunction and F3 for defrost malfunction
Cabinet warm, no code shown	Mechanical or dial-controlled cabinets show nothing at all	Some Turbo Air units use a mechanical or digital Ranco thermostat rather than an electronic controller, and report nothing	No display does not mean no fault. Check the condenser, the door seals and that nothing is blocking airflow, then call	Diagnose from behaviour rather than looking for a code that the cabinet cannot produce
E1 showing constantly on a Ranco-thermostat cabinet	Reported by technicians as a controller failure on that specific control	Failed digital Ranco thermostat	No operator action	Field-reported rather than published: technicians report that a constant E1 on the digital Ranco control means the control needs replacing. Confirm the control type before acting on it
A2 (Danfoss EKC controller)	Low temperature alarm	Cabinet colder than its low alarm limit. Less urgent than a high alarm and easier to ignore, but it freezes product that should not be frozen and usually means a setpoint or a sensor rather than a refrigeration fault	Check the setpoint has not been knocked down	Sensor placement and thermostat differential
A4 (Danfoss EKC controller)	Door alarm. This is the code our table previously attributed to A1	Danfoss's own list gives A4 as the door alarm, triggered from the door input. Door left open, a failed door switch, or a gasket or hinge holding the door off its seal	Check the door actually closes and seals, then the switch	Door switch, harness and DI input
A45, A59 (Danfoss EKC controller)	NOT FAULTS: standby and case cleaning	A45 means refrigeration has been STOPPED deliberately, via the r12 parameter or a digital input, and A59 means case cleaning mode is signalled from a DI input. Both look like alarms and both mean somebody switched the cooling off on purpose. A cabinet warming with A45 showing has not failed, it has been told to stop	Before treating a warm cabinet as broken, check for A45 or A59 on the display. Somebody may have put it in standby or cleaning mode and not put it back	Check r12 and the DI inputs before diagnosing refrigeration
E6 (Danfoss EKC controller)	Fault in the real-time clock	Danfoss's remedy is to check the battery and reset the clock. Harmless in itself, and not harmless in effect: a controller with a lost clock cannot run scheduled defrosts correctly, so this often precedes an icing complaint	Report it even though nothing looks wrong. It is a battery	Replace the battery and reset the clock, then confirm the defrost schedule
S-codes (Danfoss EKC controller)	STATUS codes, not faults, and the S17 one gets misread constantly	Danfoss publishes a separate status set that shares the display with the alarms: S0 regulating, S2 and S3 compressor minimum on and off times running, S10 refrigeration stopped by the main switch, S11 stopped by the thermostat, S14 defrost in progress, S15 fan delay after defrost while water attaches to the evaporator, S17 DOOR OPEN, S20 emergency cooling, S25 manual control of outputs, S32 output delayed at start-up. None is a fault. S20 is the one worth knowing: emergency cooling means a defined sensor signal is missing and the controller is running on a recorded average cut-in frequency instead, so the cabinet is being cooled BLIND	An S-code is the controller telling you what it is doing. S20 is the exception worth reporting, because the machine is running without a sensor it needs	S20 points at a missing S3 or S4 signal. S2, S3 and S32 explain a compressor that will not start on demand
Copy-key numbers 0 and 4 to 10	Not equipment faults at all: results of copying settings with a copy key	When settings are copied to or from a copying key using functions o65 or o66, Danfoss returns a number: 0 copying concluded and OK, 4 key not correctly mounted, 5 copying was not correct so repeat, 6 copying to the EKC incorrect, 7 copying to the key incorrect, 8 copying not possible because the order number or software version do not match, 9 communication error and timeout, 10 copying still in progress	You will only see these if someone is programming the controller	An 8 means the replacement controller is not the same order number or software version as the one it came from, which is worth knowing before blaming the key

Refrigerant-side work legally requires an EPA Section 608 certified technician, and opening electrical panels is technician work. When in doubt, record the code and the cycle behavior; that detail alone shortens the service call.

If this needs a refrigeration technician

7 companies in this directory name Turbo Air on their own site: that page shows who has been phone-confirmed, who publishes 24/7 cover, and what each puts in writing. Start there if the brand matters more than the city.

Two questions worth reading before you ring anyone: what to do first when a code appears and how to tell whether it is yours to fix.

Or browse refrigeration service companies by state:

Indiana: Evansville · Fort Wayne · Indianapolis · South Bend

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Pennsylvania: Allentown · Altoona · Erie · Harrisburg · Lancaster · Pittsburgh · Scranton · Williamsport

West Virginia: Charleston · Clarksburg · Huntington · Martinsburg · Morgantown · Parkersburg · Wheeling

Related: the PM checklist that prevents the most common codes outright, and the operator guides for symptom-first diagnosis.

Not sure this is the right make? The lookup by code shows every make that uses a given code, and flags the ones that mean different things depending on the machine in front of you.