The tables apply to Citimax 280, 350 and 400 units. Supra and Vector use different indication and their codes are not included here. Elinge codes are letter-based and are covered on a separate page.
| Code | Meaning | What to check |
|---|---|---|
| A01 | the low-pressure switch has opened (stops the unit) | circuit pressure, a refrigerant leak, the switch itself, connector and wiring, fan operation |
| A02 | the high-pressure switch has opened | circuit pressure, the high-pressure switch, connector and wiring, the condenser fan |
| A04 | open circuit in the compressor clutch | wiring and connector, the clutch itself, the microprocessor |
| A06 | short circuit in the condenser fan | wiring and connector, the fan, the microprocessor |
| A07 | short circuit in the evaporator fan motor | wiring and connector, the fan, the microprocessor |
| A09 / A10 / A11 | short circuit in a valve circuit: pre-evaporator, injection or pre-condenser | wiring, connector and the valve coil |
| A21 | short circuit in the compressor clutch circuit | wiring, connector, the clutch |
| A22 | open circuit in the condenser fan motor | wiring and connector, the fan, the microprocessor |
| A23 | open circuit in the evaporator fan motor | the unit configuration, wiring and connector, the fan |
| A24 / A25 / A26 | open circuit in a valve: pre-evaporator, injection or pre-condenser | the configuration, wiring, connector and coil |
| E2P | a memory read or write fault; the setpoint is outside −29…+30 °C | the parameter settings, the microprocessor |
The marked codes stop the unit.
| Code | Meaning | What to check |
|---|---|---|
| EE | the evaporator temperature sensor has failed — open or short (stops the unit) | the sensor, connector, wiring |
| EEE | the defrost termination sensor has failed | the sensor, connector, wiring |
| bAt | low battery voltage (stops the unit) | the vehicle battery and alternator |
| con | no link between the control panel and the microprocessor | the panel cable, connectors, the panel itself, the microprocessor |
| Err | the setpoint is below the allowed limit | the setpoint |
Out of 130 job records with a fault description, 2026.
| Code | Jobs |
|---|---|
| A01 | 11 |
| A04 | 3 |
| A22 | 3 |
A01 is the most frequent code: the low-pressure switch has opened, so a refrigerant leak and the circuit pressure are checked first. On jobs with code A22 the condenser fan and its fuse were replaced, which matches an open circuit in the condenser fan.
Code bAt comes down to the battery and alternator: at low voltage the unit stops by itself. Code con is the link between the panel and the microprocessor — the cable and connectors are worth a look. Pressure and valve circuit codes are not cleared on the spot; they need diagnostics with a manifold gauge set.
Citimax 280, 350 and 400. Supra and Vector use different indication and are not included here.
The low-pressure switch has opened. The circuit pressure and a possible refrigerant leak are checked first, then the switch, connector and wiring.
A01, and among the display codes EE and bAt. The others let the unit run, but the cause still has to be fixed.
Describe the problem and send damage photos via WhatsApp — we will assess the scope of work.
📞Phone