Towable Air Compressor Fault Codes
Diesel-driven towable air compressors run jackhammers, sandblasters, and pneumatic tools on construction sites everywhere. Atlas Copco is the rental fleet leader (Sunbelt, United, Herc), with Sullair and Doosan / Ingersoll Rand close behind. Most run Kubota, Deutz, or CAT diesels coupled to a rotary-screw airend, with the Atlas Copco Xc4002 / Xc2003 controller managing engine, oil pressure, air temperature, and unload cycles. This hub covers the codes you actually see in the field.
140 fault codes documented· Atlas Copco / Sullair / Doosan · Towable + electric shop-air
Most Common Air Compressor Fault Codes
Showing 24 of 140 Air Compressor codes across Atlas Copco, Sullair, and Doosan / Ingersoll Rand, sorted by severity. Each links to causes, diagnostics, and common fixes.
ATLAS-COPCO-2000 critical
Emergency Stop (Alarm 2000)
ATLAS-COPCO-2005 critical
Immediate Stop (Alarm 2005)
ATLAS-COPCO-2420 critical
Emergency Run (Alarm 2420)
ATLAS-COPCO-3060 critical
Alarm 3060 — Meaning Depends on Controller: Vessel pressure high shutdown / Working pressure high shutdown
ATLAS-COPCO-3065 critical
Alarm 3065 — Meaning Depends on Controller: Vessel pressure high shutdown 2 / Working pressure high shutdown 2
DOOSAN-CODE-1 critical
Compressor Discharge Temperature Switch (S3) Open — Overheat Shutdown
DOOSAN-CODE-2 critical
Separator Tank Temperature Switch (S2) Open — Overheat Shutdown
DOOSAN-CODE-5 critical
Engine Oil Pressure Switch (S5) Open — Shutdown
DOOSAN-CODE-6 critical
Regulation Pressure Transducer (PT2) Out of Limits — Shutdown
DOOSAN-CODE-8 critical
Low Fuel Shutdown (U1 Switch Open)
SULLAIR-E-STOP critical
E-Stop Push Button Active
SULLAIR-HIGH-SUMP-PRESSURE critical
High Sump Pressure — Control/Valve Fault
SULLAIR-HIGH-TEMPERATURE critical
High Temperature 1/2/3 — Discharge Over-Temperature Fault
SULLAIR-MAIN-MOTOR-OVERLOAD critical
Main Motor Overload — Relay Tripped
SULLAIR-STARTER-AUX-CONTACT critical
Starter Aux. Contact — Starter Failed to Operate
ATLAS-COPCO-2010 serious
Alarm 2010 — Meaning Depends on Controller: Conf digital input 1 alarm / Coolant Temperature
ATLAS-COPCO-2020 serious
Alarm 2020 — Meaning Depends on Controller: Conf digital input 2 alarm / Engine Oil Pressure Alarm
ATLAS-COPCO-2030 serious
Alarm 2030 — Meaning Depends on Controller: Conf digital input 3 alarm / Engine Coolant Level
ATLAS-COPCO-2040 serious
Alarm 2040 — Meaning Depends on Controller: Compressor Element Temperature / Conf digital input 4 alarm
ATLAS-COPCO-3010 serious
Fuel level low 2 (Alarm 3010)
ATLAS-COPCO-3400 serious
Pumper oil pressure alarm 1 (Alarm 3400)
ATLAS-COPCO-3410 serious
Pumper oil pressure alarm 2 (Alarm 3410)
ATLAS-COPCO-3420 serious
Pumper oil pressure sensor circuit (Alarm 3420)
ATLAS-COPCO-4000 serious
Alarm 4000 — Meaning Depends on Controller: L.P. Element temp. alarm 1 / single stage 2 elements
Compressor Brands
| Brand | Applications | Notes |
|---|---|---|
| Atlas Copco | XAS 185 / 375 / 800 towables, XATS / XAVS variants, XL/XR shop-air | Dominant in construction rental fleets. Diesel models run Kubota, Deutz, or CAT engines with Xc4002 / Xc2003 / Xc4004 controllers. |
| Sullair | 185, 260, 375, 750 towables; rotary screw shop-air | Hitachi-owned. Common in rental fleets alongside Atlas Copco. Different controller platform; codes vary. |
| Doosan / Ingersoll Rand | P185, P425, P600 towables | Doosan acquired the Ingersoll Rand portable power line in 2007. Same chassis families remain in service. |
Common Air Compressor Issues
- Air outlet temperature high (E003) -- low compressor oil, blocked oil cooler, excessive duty cycle
- Engine coolant temperature high (E002) -- radiator fouling from jobsite dust
- Battery voltage low (E010) -- worn battery in towable yard storage
- Compressor oil pressure low (E004) -- airend lubrication problem
- Fuel filter restriction (E031) -- contaminated diesel, missed service interval
- Engine overspeed (E020) -- stuck unloader valve or runaway fuel condition
- Air filter restriction (E040) -- dust accumulation on extended jobsite use