COMPRESSOR_FAULT
Applicable alarms (1)
Likely outcomes — click to expand
Based on 0 missions where this alarm fired in the last 90 days as of 2026-10-13
Aggregated from fleet operations and refreshed daily. Individual outcomes may vary by site and configuration.
Background
Section titled “Background”This alarm occurs when the thermal system compressor controller has a fault. Usually this indicates a hardware problem with the compressor that will require replacement of the thermal system.
Troubleshooting Steps
Section titled “Troubleshooting Steps”graph TD
which-dock-model-is-affected{"<small><b>Step 1</b></small><br/>Question: Which Dock model is affected?"}
restart-the-thermal-system-service-ev3["<small><b>Step 2</b></small><br/>Action: Restart the thermal system service. F..."]
restart-the-thermal-system-service-ev4["<small><b>Step 3</b></small><br/>Action: Restart the EV4 Dock thermal system s..."]
did-the-ev3-alarm-clear{"<small><b>Step 4</b></small><br/>Question: Did the alarm clear?"}
did-the-ev4-alarm-clear{"<small><b>Step 5</b></small><br/>Question: Did the alarm clear?"}
return-the-dock-to-service["<small><b>Step 6</b></small><br/>Action: Return the Dock to service."]
replace-the-ev3-thermal-system["<small><b>Step 7</b></small><br/>Action: Create a work order to replace the th..."]
replace-the-ev4-thermal-system["<small><b>Step 8</b></small><br/>Action: Create a work order to replace the th..."]
which-dock-model-is-affected -->|EV3 Dock| restart-the-thermal-system-service-ev3
which-dock-model-is-affected -->|EV4 Dock| restart-the-thermal-system-service-ev4
restart-the-thermal-system-service-ev3 --> did-the-ev3-alarm-clear
restart-the-thermal-system-service-ev4 --> did-the-ev4-alarm-clear
did-the-ev3-alarm-clear -->|Yes| return-the-dock-to-service
did-the-ev3-alarm-clear -->|No| replace-the-ev3-thermal-system
did-the-ev4-alarm-clear -->|Yes| return-the-dock-to-service
did-the-ev4-alarm-clear -->|No| replace-the-ev4-thermal-system
style which-dock-model-is-affected fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style restart-the-thermal-system-service-ev3 fill:#dcfce7,stroke:#22c55e,color:#14532d
style restart-the-thermal-system-service-ev4 fill:#dcfce7,stroke:#22c55e,color:#14532d
style did-the-ev3-alarm-clear fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style did-the-ev4-alarm-clear fill:#dbeafe,stroke:#3b82f6,color:#1e3a5f
style return-the-dock-to-service fill:#dcfce7,stroke:#22c55e,color:#14532d
style replace-the-ev3-thermal-system fill:#dcfce7,stroke:#22c55e,color:#14532d
style replace-the-ev4-thermal-system fill:#dcfce7,stroke:#22c55e,color:#14532d Hover or focus a block to preview it. Select the block to keep the preview open.
1. Put the Dock into diagnostic mode, see Place Dock into Diagnostic Mode.
2. SSH into the Dock. For steps, see SSH into Dock.
3. Run
sudo systemctl restart thermal.service.4. Put the Dock back into standard mode, see Place Dock into Standard Mode.
Resolution note
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