Beverage-Air WTR, Error Codes
Applies to: WTR, UCR and HF cabinets. Compiled and paraphrased from Beverage-Air's own installation and operating instructions: document 809-170A revision C dated February 2026 for hydrocarbon WTR refrigerators, and document 809-174A revision D dated 9 February 2026 for UCF freezers, whose full electronic controller alarm table is the source for the sensor split and for Lo, Con, uHi and uLi. Worth knowing when you read 809-174A yourself: its alarm table has a copy-paste error, printing 'S1 error' as the trigger for all four sensor codes while the comments column correctly names S1, S2, S3 and S4. We have followed the comments column. The same controller families are used across UCR, HF and other cabinets. Confirm against the manual for your model. Table last updated Aug 14, 2026.
How to read the codes
Identify your controller before matching a code, because Beverage-Air fits three and they do not agree. A MECHANICAL controller is a dial with no display and shows no codes at all. A DANFOSS controller shows Hi, dOr, LEA and E01 to E04. An ELIWELL controller shows AH1, OPd, dEF and E1 to E4. The same fault therefore reads differently depending on which board is behind the panel: a warm cabinet is Hi on Danfoss and AH1 on Eliwell. Factory set point is 38F on Danfoss and mechanical units and 35F on Eliwell, and 0F on freezer cabinets. Two things the short table in the operating instructions does not tell you. First, the sensor codes are NOT interchangeable: E01 through E04 name sensors S1 through S4, and S1 is the air probe the entire control loop depends on, so E01 is a different-severity fault from E03. Second, the controller can raise Lo, Con, uHi and uLi alarms that the operator-facing table omits entirely, which is why a cabinet can alarm with a code that appears on no page of the manual an operator was given. Freezer cabinets switch the compressor on 2.5F above set point and off 2.5F below, and defrost on 6 hours of cumulative compressor runtime rather than a clock.
The codes
| Code | Meaning | Likely causes | Operator-safe steps | Technician work |
|---|---|---|---|---|
| Hi (Danfoss) / AH1 (Eliwell) | Cabinet temperature too warm | Door or drawer left open, heavy warm load, dirty condenser, or a refrigeration fault | Confirm the doors and drawers are closed, then check the condenser is clean. Beverage-Air asks for monthly inspection and quarterly cleaning, and says a dirty coil can VOID THE WARRANTY | Condenser condition, door seals, then charge and compressor diagnosis. There are no access valves on these systems |
| dOr (Danfoss) / OPd (Eliwell) | Door is open | Door genuinely open, failed door switch, or a gasket or hinge holding it off the seal | Close the door. Beverage-Air's own instruction is explicit: if the message does not clear with the door shut, call for service, because the fault is the switch rather than the door | Door switch and light contact circuit, gasket and hinge alignment |
| LEA (Danfoss) | Compressor run time too long | Doors being opened constantly, dirty condenser, low charge, or ambient above the 100F limit these cabinets are rated for | Check the doors are closing. If they are, this needs a technician: continuous running is how compressors fail | Condenser, ambient, charge. Undercharge shows as long run time, poor cooling and a hot compressor dome; overcharge as an unusually cold suction line with long run time |
| dEF (Eliwell) | The unit is defrosting | Normal operation, not a fault | Nothing. Beverage-Air lists this alongside the alarms precisely because operators mistake it for one | No action. Eliwell units defrost as needed rather than on a fixed schedule |
| E01 / E1 | Sensor S1 has failed, short or open. S1 is the air temperature probe | Disconnected probe, damaged harness, or a failed sensor. S1 is the probe the whole control loop runs on, sited at the return air | Call for service. With S1 gone the cabinet cannot control temperature at all, so check product temperatures with a separate thermometer meanwhile | The display blinks S01 against this code. Probe continuity and resistance, harness inspection, controller terminal check. On the Danfoss detail the air probe lands on terminal S1 |
| E02 / E2 | Sensor S2 has failed, short or open. S2 is the evaporator coil probe used to terminate defrost | Disconnected probe, damaged harness, or a failed sensor | Call for service. The cabinet may still cool but defrost termination is compromised, which shows up as icing | Display blinks S02. Check the coil probe: a defrost that never terminates on temperature is the symptom that follows |
| E03 / E3 | Sensor S3 has failed, short or open | Disconnected probe, damaged harness, or a failed sensor. Not every model populates S3 | Call for service | Display blinks S03. Confirm the model actually uses S3 before chasing it; the terminal exists on the controller whether or not a probe is fitted |
| E04 / E4 | Sensor S4 has failed, short or open | Disconnected probe, damaged harness, or a failed sensor. Not every model populates S4 | Call for service | Display blinks S04. As with S03, check the wiring diagram for your model before assuming a probe is missing |
| Blue dot or blue light on the display, no code | The controller is in standby, not faulted | The defrost button was held down long enough to trigger standby | This is the most commonly misread display on these cabinets and it is not a fault. Press and HOLD the defrost button until the display reads ON | No fault. Worth checking before travelling to site |
| No display, no cooling, unit silent | No power reaching the cabinet | Unplugged, tripped breaker, loose plug, or a GFCI that has tripped | Check the plug and breaker. Note that Beverage-Air says these units should NOT be on a GFI or GFCI outlet, because a nuisance trip from moisture loses the whole load | Variable speed compressor models can nuisance-trip Class A GFCI outlets rated 4 to 6mA; Beverage-Air specifies a hospital grade self-test receptacle where GFCI protection is required, and does not cover nuisance tripping under warranty |
| Lo | Cabinet temperature too cold | Set point too low, a control calling for cooling that will not stop, or a probe reading high | Check the set point has not been changed. Beverage-Air notes that lowering the set point does NOT cool the cabinet faster, so a set point moved down to speed things up only produces this | Triggered when air temperature stays below the LAt threshold for the Ltd delay. Both are user configurable, so confirm the parameters before condemning a control |
| Con | Condenser temperature is too high or too low | Dirty condenser, blocked front grille, ambient outside the 60F to 100F rating, or a failed condenser probe | Check the front grille is clear and the coil is clean. This is the alarm that most often precedes a warm cabinet rather than following one | Clearance is 2 inches at the rear and the front grille must be unobstructed. Air filters are explicitly NOT recommended: they restrict cooling air |
| uHi | Line voltage too high | Supply voltage above the ceiling, shared circuit, or a site power problem | This is a building electrical issue, not a cabinet fault. These units are rated 103.5 to 126.5 volts and must be on a dedicated circuit with no extension cord | Compare measured supply against the Cop/uHi parameter. Repeated high-voltage alarms point at the supply, not the controller |
| uLi | Line voltage too low | Undersized or shared circuit, long run of undersized wire, or an extension cord | Same as uHi: an electrical supply problem. Extension cords are not permitted on these cabinets | Low voltage also shows as a compressor that hums but will not start. Beverage-Air’s own trouble table sends you to voltage first on that symptom, then the start relay and capacitor |
| Alarm LED on solid vs flashing | Whether an alarm is present or has merely been silenced | Any button press silences an audible alarm without clearing the condition | Solid means the alarm is live. FLASHING means someone silenced it and the fault is still there. A flashing alarm LED with a normal-looking temperature is the display telling you a fault was acknowledged and never fixed | Also note the compressor LED: flashing means the compressor is being held off by a delay, protection or block, not that it has failed. If alarm exclusion times are set in the ALA parameter folder, a genuine alarm may not be signalled at all |
If this needs a refrigeration technician
15 companies in this directory name Beverage-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.
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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.