Carrier Maxima Error Code Quick Guide
This quick guide will provide you with information on the error codes for Carrier Maxima refrigerated trucks. We will provide you with key error codes and troubleshooting recommendations so that you can quickly and efficiently resolve any equipment issues.
Model: Carrier
Series: Maxima
| CODE | ENGLISH | DESCRIPTION |
| AL0 | ENG OIL | Engine oil pressure < 1 bar (OP) |
| AL1 | ENG HOT | Engine temperature > 110 C (WTS) |
| AL2 | HI PRESS | High pressure, discharge, low pressure suction (LP1, HP1) |
| AL3 | STARTFAIL | Autostart failure after 3 attempts |
| AL4 | LOW BATT | Battery Voltage < 10V |
| AL5 | HI BATT | Battery Voltage > 17V |
| AL6 | DEFRFAIL | Defrost Cancel > 45 min (DTT) |
| AL7 | ALT AUX | Generator failure |
| AL8 | STARTER | Starter failure |
| AL9 | RA SENSOR | RAS Temperature Sensor Failure |
| AL10 | SA SENSOR | SAS Temperature Sensor Failure |
| AL11 | WT SENSOR | WTS Engine Temperature Sensor Failure |
| AL12 | HIGH CDT | Not Used (Sensor Missing) |
| AL13 | CD SENSOR | М1200/1300 – Discharge temperature sensor failure M2 – Not used (sensor is missing on all units) |
| AL14 | SBY MOTOR | Electric motor overload/overheating |
| AL15 | FUSE BAD | Fuse Blown |
| AL16 | SYSTEM CK | Check Cooling System |
| AL17 | DISPLAY | Display failure or bus damage between display and processor |
| AL18 | SERVICE 1 | Service #1 required |
| AL19 | SERVICE 2 | Service #2 required |
| AL20 | RAS OUT | Temperature in the body (compartment 1) "out of tolerance" |
| AL21 | 2 RA. OUT | Temperature in the body (compartment 2) "out of tolerance" |
| AL22 | 3 RA. OUT | Only on Maxima 1200 Mt |
Reference:
AL0 – by OP sensor. Time delay – Δt=10 sec, or 15 trips in a row. If it occurs before the engine starts – there is a problem with the generator (AL7). The engine stops.
AL1 – by WTS sensor. On new units, the shutdown logic depends on the ATS sensor readings. If ATS < 50 °C, shutdown at a temperature of 110 °C. If ATS > 50 °C, a 5-minute countdown and shutdown if the temperature has not dropped below 110 °C. At 116 °C – immediate shutdown of the unit.
AL2 – high discharge pressure or low suction pressure, since the LP and HP sensors are in series in the circuit.
AL3 – oil pressure did not appear and the battery did not charge.
AL4– below 10V, excluding the starter and spark plugs operating time, time delay of 15 sec (with Eprom 3.29).
AL5 – above 17V. Either the voltage regulator or the processor is faulty.
AL6 – the DTT sensor did not open after 45 minutes. Cooling mode is turned on, the defrost interval is set to 1.5 hours.
AL7 – 12V disappears from contact 29 of the processor. If the error occurred before the engine was started, the problem is with the oil pressure sensor (AL0) - "stuck".
AL8 – when the starter is turned on, the starter motor power supply circuit must be energized.
AL9 – RAS is open or shorted. If the set temperature is below -12 °C, operation in cold mode at low speed. At the set temperature above -12 °C, the unit stops.
AL10 – SAS is open or shorted. Control is transferred to RAS.
AL11 – WTS is open or shorted. The unit does not stop.
AL13 – CDT discharge temperature sensor is open or shorted (not available on all units).
AL14 – in standby mode, there is no signal on processor contact 27. Either current or thermal protection has tripped.
AL15 – fuses are monitored, next to which diodes are installed (current appears on contact 34 of the processor).
AL17 – communication between the display module and the processor is lost.
AL18 – engine hour meter. At the factory, it is set to 400 hours. When performing maintenance, set 1000 hours using the Reefer Manager program (connection via a serial port).
AL20,21 – the set temperature was reached at least once, then went out of the permissible range, and cannot return within 15 minutes.
