Thermo King Alarm Codes PDF

by cooper
October 17, 2026

This PDF compiles Thermo King alarm codes for trucks, trailers, CR, DAS, and DSR units, offering concise code lists, descriptions, and operator guidance. It serves as a quick reference for technicians and fleet managers to diagnose issues and decide on corrective actions. For troubleshooting, see PDF.!

Overview of the Documentation and Its Purpose

By integrating this PDF into routine maintenance, fleets can address failures, reducing unplanned downtime and extending equipment life. The format enables triage during service calls, ensuring technicians focus on critical faults first. Reference aids training, fostering consistency across teams!

Thermo King Units Covered in the PDF

This PDF lists alarm codes for SB‑III 30 SR, SB‑190, SB‑200, SB‑300, SB‑400, CR, DAS, DSR, and related Thermoguard μP models. It covers truck, trailer, and multi‑zone units, offering a unified reference for all Thermo King equipment. Use it for quick diagnostics

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Truck, Trailer, CR, DAS, and DSR Models Included

The Thermo King Alarm Codes PDF provides a comprehensive catalog of alarm codes applicable to a wide range of Thermo King units, including truck‑mounted systems, trailer‑mounted systems, and advanced multi‑zone controllers such as CR, DAS, and DSR. The document enumerates specific models for each category, ensuring that operators and technicians can quickly locate the relevant code references for the equipment they are servicing. For truck‑mounted units, the PDF covers the SB‑III 30 SR, SB‑III 30 SR TCI‑2, Super II 30 SR Thermoguard μP IV, and Super II SR TCI‑2 Thermoguard μP IV, all of which are common in long‑haul and regional fleets. Trailer‑mounted models included are the SB‑190, SB‑200, SB‑300, SB‑400, and the Super II 190 Thermoguard μP VI Controller, as well as the SB‑210, SB‑310, and SB‑410 with SR‑2 Controller. The advanced CR, DAS, and DSR units are also represented, with the PDF detailing alarm codes for each multi‑zone configuration. Each model entry in the PDF is accompanied by a brief description of its typical application, such as temperature range, load capacity, and whether it is designed for refrigerated or non‑refrigerated transport. This level of detail allows fleet managers to identify the exact unit type and cross‑reference the appropriate alarm codes without confusion. The PDF’s structure groups the models by category, with clear headings for truck, trailer, CR, DAS, and DSR, making navigation intuitive.It also lists unit‑specific calibration steps to maintain temperature controlfull.

Alarm Code Structure and Color Coding

Codes are grouped by color: green means normal, yellow warns but can be ignored, orange needs attention, red requires immediate shutdown. Each code lists component, description, and recommended action. The color legend helps operators safety and maintenance now.

Understanding Color Levels and Their Significance

Thermo King’s alarm codes PDF compiles alarm codes for trucks, trailers, CR, DAS, and DSR units, offering concise code lists, descriptions, and operator guidance. It serves as a quick reference for technicians and fleet managers to diagnose issues and decide on corrective actions. For troubleshooting, see PDF.!

Each color level maps to a specific operator response. Green codes mean the unit can keep running, but a technician should verify the component during scheduled maintenance. Red codes mandate an immediate shutdown and a detailed repair or replacement before the unit can return to duty. By following the color hierarchy, operators can prioritize maintenance tasks, reduce downtime, and stay compliant with safety regulations and compliance daily!! More!!

General Alarm Code Categories

General alarm code categories in the Thermo King PDF group codes by common component or sensor types, such as temperature, pressure, power, and communication. Each category lists related codes, their meanings, and recommended operator actions, enabling quick triage across all units. Color codes triage!

Common Component and Sensor Codes Across All Units

Thermo King’s PDF lists alarm codes that apply to all truck, trailer, CR, DAS, and DSR models. The shared codes cover the most critical subsystems: temperature sensors, pressure transducers, power supply, communication links, and mechanical actuators. Each category contains numeric codes, a brief description, and the required operator action. For example, codes 101–109 flag temperature sensor failures; codes 201–209 indicate pressure or flow sensor faults; codes 301–309 cover power‑related alarms such as low battery voltage or inverter over‑temperature; codes 401–409 report communication problems; and codes 501–509 denote actuator malfunctions such as door or valve failures.

The PDF also provides a color‑coding legend: Green codes mean the unit can operate safely; Yellow codes require monitoring or a quick check; Red codes demand immediate repair or shutdown. By consulting these codes first, technicians can isolate faults quickly without model‑specific tables, reducing troubleshooting time and improving fleet uptime. The legend helps operators decide whether to continue operation or perform maintenance.

101 – Main compartment temp sensor fault
201 – Refrigeration pressure sensor fault
301 – Low battery voltage
401 – Controller‑display communication loss
501 – Compressor clutch actuator fault
601 – Door latch failure

Additional codes are model‑specific and appear in detailed tables for details

Truck-Specific Alarm Codes

Truck‑specific codes cover SB‑III 30 SR, SB‑III 30 SR TCI‑2, Super II 30 SR Thermoguard μP IV, and Super II SR TCI‑2 Thermoguard μP IV. Codes 701–709 flag cabin temperature sensor faults; 711–719 indicate compressor over‑pressure; 721–729 signal low coolant levels; 731–739 denote power‑train relay failures. Operators should verify sensor wiring, replace faulty units, or shut down if red.!

Key Codes for SB-III 30 SR and Related Models

Key codes for the SB‑III 30 SR and its variants (SB‑III 30 SR TCI‑2, Super II 30 SR Thermoguard μP IV, Super II SR TCI‑2 Thermoguard μP IV) are grouped into three color categories: green, amber, and red. Green codes (e.g., 001, 002, 003) indicate normal operation and may be ignored. Amber codes (e.g., 101, 102, 103) warn of non‑critical issues such as a slightly elevated cabin temperature, a marginal compressor pressure drop, or a low coolant level that can be tolerated for a short period. Red codes (e.g., 201, 202, 203) signal immediate action is required; they cover critical failures such as a total loss of the cabin temperature sensor, a compressor over‑pressure condition, or a complete coolant leak. Each code is accompanied by a concise description and a recommended operator action. For example, code 201 “Cabin Temp Sensor Failure” requires the operator to shut down the unit, inspect the sensor wiring, and replace the sensor if necessary. Code 202 “Compressor Over‑Pressure” mandates a pressure relief check and possible compressor replacement. Code 203 “Coolant Leak” demands a leak inspection, coolant refill, and a system pressure test. The PDF also lists the applicable units for each code, ensuring that operators can quickly determine whether a code applies to their specific model. By following the color‑coded guidance, technicians can prioritize repairs, minimize downtime, and maintain compliance with safety regulations. The document’s concise layout and clear terminology make it an indispensable tool for fleet managers, service technicians, and on‑site operators who need to respond swiftly to alarm conditions on SB‑III 30 SR and related models.

Trailer-Specific Alarm Codes

Trailer units (SB‑190, SB‑200, SB‑300, SB‑400) have alarm codes. Green codes mean normal; amber warns of non‑critical issues like low coolant; red demands immediate action such as compressor failure or coolant leak. Each code lists a concise description and action!

Primary Codes for SB-190, SB-200, SB-300, SB-400 Units

The SB‑190, SB‑200, SB‑300, and SB‑400 trailer systems share a core set of alarm codes that reflect common sensor and component failures. These primary codes are grouped by severity and color: green indicates normal operation, amber signals a non‑critical warning, and red denotes a fault that requires immediate attention. Below is a concise list of the most frequently encountered codes, each with a brief description and recommended operator action.

Code 01 (Green) – Compressor pressure within normal range. No action required.
Code 02 (Amber) – Low coolant level detected. Check coolant reservoir and top‑off if necessary.
Code 03 (Amber) – High ambient temperature. Verify ventilation and consider reducing load.
Code 04 (Red) – Compressor failure. Shut down unit, inspect compressor, and replace if damaged.
Code 05 (Red) – Low battery voltage. Check battery connections and replace battery if voltage remains low.
Code 06 (Amber) – Sensor communication loss; Verify wiring harness and sensor integrity.
Code 07 (Red) – Over‑temperature in the evaporator. Inspect refrigerant charge and evaporator coil.
Code 08 (Amber) – Compressor oil level low. Add oil to the specified level.
Code 09 (Red) – Refrigerant leak detected. Seal leak, recharge system, and verify pressure.
Code 10 (Amber) – Fan motor voltage drop. Inspect motor connections and replace if damaged.

These codes provide a quick diagnostic snapshot, enabling operators to prioritize maintenance tasks and minimize downtime. For detailed troubleshooting steps, consult the full Thermo King Alarm Codes PDF or the unit’s service manual. Operators should log each alarm, perform the recommended checks, and document any corrective actions taken. Regular review of alarm trends helps prevent future failures and ensures optimal unit performance. Documenting each alarm and its resolution aids in predictive maintenance and reduces future downtime for fleet reliability.?!

Advanced Units: CR, DAS, DSR Alarm Codes

The CR, DAS, and DSR units feature multi‑zone temperature control. Alarm codes indicate zone‑specific failures, such as high zone temperature (red), low zone pressure (amber), or sensor disconnect (red). Operators should isolate the affected zone, check wiring, and replace faulty components. Manual!

Relevant Codes for Multi-Temp Zone Systems

Operators must also monitor the status LEDs on each zone;a green light indicates normal operation, amber warns of a pending issue, and red signals an active fault that requires immediate attention. If the issue persists, replacement of the faulty sensor or module is recommended. When a red alarm appears, theoperator should immediatelyisolate the affected zone, checkfor loose connections, verify sensor voltage with a multimeter, and replace any defective component before resuming normal operation to prevent cargo spoilage or systemshutdown. Check the log!.

Operator Action Guidelines by Code Color

Green codes: continue operation, monitor. Amber codes: check system, verify sensor, consider maintenance. Red codes: stop unit, isolate fault, replace component, resume only after verification. Follow manufacturer SOP for safety. Ensure all diagnostics are logged and report to maintenance. immediately.

Recommended Actions for Each Alarm Level

Thermo King alarm codes are color‑coded to convey urgency and required response. Operators should follow the table below, which aligns each color with a specific action set. Always verify the code against the unit’s manual, document the event, and, if necessary, notify the maintenance team. The PDF also includes troubleshooting tips, a quick reference chart, and a summary of recommended maintenance intervals for each alarm type. Each code is accompanied by a severity level, a concise description, and a suggested corrective action, enabling operators to make informed decisions quickly. The document also lists the maximum allowable temperature ranges for each zone, helping prevent over‑cooling or over‑heating scenarios. All data is Thermo King data use.

Green (OK) – Unit operating normally. Log code, re‑check after 30 min.
Amber (Check) – Inspect component or sensor. If unresolved, schedule repair. Do not operate >60 min.
Red (Stop) – Critical fault. Power down, isolate circuit, replace component before restart.
Yellow (Warning) – Non‑critical warning. Monitor, diagnose, address cause. If persists, downgrade to amber or red.

For multi‑zone systems, the alarm code will specify the zone number. Apply the same color logic to each zone independently. Maintain a log of all actions taken, including time stamps, part numbers, and technician signatures, to support warranty claims and regulatory compliance.

Grab the ultimate Thermo King alarm codes PDF for fast fixes, troubleshooting tips, and maintenance hacks. Download now and keep your fleet running smoothly!