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Atlas Copco Fault Codes

101 Atlas Copco generator fault/alarm codes with symptom, cause and remedy — compiled from Atlas Copco service and controller documentation.

Fault / alarm codes

101

Code	Meaning / symptom	Cause	Remedy	Models affected
11	VSG input low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
12	VSG input high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
13	Coolant level circuit low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
13	Air and oil mist expelles from air filters immediately after stopping	Unloader valve jammed	Check and, if necessary consult Atlas Copco	Atlas Copco XA(S) 137 KdG, Atlas Copco XA(S) 300 KD7G
14	Intercooler, coolant or oil temperature circuit high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
14	Engine overheating	Insufficient engine cooling	Relocate compressor	Atlas Copco XA(S) 137 KdG, Atlas Copco XA(S) 300 KD7G
15	Intercooler, coolant or oil temperature circuit low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
15	Compressor overheating	Insufficient compressor cooling	Locate compressor away from walls; when banked with other compressors, leave space between them	Atlas Copco XA(S) 137 KdG, Atlas Copco XA(S) 300 KD7G
16	Coolant level circuit high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
16	After working for some time, the unit stops for no apparent reason	Air in fuel system, or insufficient fuel supply	Check filters and hoses for leaks, dirt and bends	Atlas Copco XA(S) 137 KdG, Atlas Copco XA(S) 300 KD7G
17	Bypass position circuit high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
18	Bypass position circuit low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
18	Engine coolant temperature input voltage high			Atlas Copco QAS generator set with JDEC system
19	Engine coolant temperature input voltage low			Atlas Copco QAS generator set with JDEC system
21	TPS circuit high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
21	Sensor supply voltage high			Atlas Copco QAS generator set with JDEC system
22	TPS circuit low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
22	Sensor supply voltage low			Atlas Copco QAS generator set with JDEC system
23	Fuel temperature circuit high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
23	Engine oil pressure input voltage high			Atlas Copco QAS generator set with JDEC system
24	Fuel temperature circuit low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
24	Engine oil pressure input voltage low			Atlas Copco QAS generator set with JDEC system
25	No codes			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
26	Auxiliary shutdown #1 or #2 active			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
27	Air temperature circuit high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
28	Air temperature circuit low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
31	Auxiliary output short or open circuit (high side)			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
32	SEL short or open circuit			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
33	Boost pressure circuit high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
34	Boost pressure circuit low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
35	Oil pressure circuit high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
36	Oil pressure circuit low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
37	Fuel pressure circuit high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
38	Fuel pressure circuit low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
41	Too many SRS (missing TRS)			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
42	Too few SRS (missing SRS)			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
43	Coolant level low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
44	Intercooler, coolant or oil temperature high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
45	Oil pressure low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
46	Battery voltage low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
47	Fuel pressure high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
48	Fuel pressure low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS228 Gd USA
52	A/D conversion fail			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS246 Gd USA
52	A/D co			Atlas Copco QAS228 Gd USA, Atlas Copco QAS228 Gd USA 3V-SW RS
53	EEPROM write or nonvolatile checksum fail			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS246 Gd USA
54	Vehicle speed sensor fault			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS246 Gd USA
55	J1939 data link fault			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS246 Gd USA
56	J1587 data link fault			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS246 Gd USA
57	J1922 data link fault			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS246 Gd USA
58	Torque overload			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS246 Gd USA
61	Injector response time long			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS246 Gd USA
62	Auxiliary output open or short to battery			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA, Atlas Copco QAS246 Gd USA
63	PWM open or short to battery			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
64	Turbo speed circuit failed			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
67	Coolant pressure circuit high or low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
68	IVS switch fault, open or grounded circuit			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
71	Injector response time short			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
72	Vehicle overspeed			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
75	Battery voltage high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
76	Engine overspeed with engine brake			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
81	Oil level or crankcase pressure circuit high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
82	Oil level or crankcase pressure circuit low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
83	Oil level or crankcase pressure high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
84	Oil level or crankcase pressure low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
85	Engine overspeed			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
86	Fluid pump or barometer pressure circuit high			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
87	Fluid pump or barometer pressure circuit low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
88	Coolant pressure low			Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
Blink 26	Manifold air temperature input voltage low			Atlas Copco QAS generator set with JDEC system
Blink 28	ECU error			Atlas Copco QAS generator set with JDEC system
Blink 32	When reading blink codes, signifies start of active fault codes			Atlas Copco QAS generator set with JDEC system
Blink 33	When reading blink codes, signifies start of stored fault codes			Atlas Copco QAS generator set with JDEC system
Blink 37	Fuel temperature input voltage high			Atlas Copco QAS generator set with JDEC system
Blink 38	Fuel temperature input voltage low			Atlas Copco QAS generator set with JDEC system
Blink 39	Crank position input error			Atlas Copco QAS generator set with JDEC system
Blink 42	Engine over speed moderate or extreme			Atlas Copco QAS generator set with JDEC system
Blink 54	ECU power down error			Atlas Copco QAS generator set with JDEC system
Blink 62	Engine coolant temperature high - least severe			Atlas Copco QAS generator set with JDEC system
Blink 63	Engine coolant temperature high - moderately severe			Atlas Copco QAS generator set with JDEC system
Blink 64	Engine oil pressure moderately low			Atlas Copco QAS generator set with JDEC system
Blink 65	Engine oil pressure extremely low			Atlas Copco QAS generator set with JDEC system
Blink 66	Manifold air temperature moderately high			Atlas Copco QAS generator set with JDEC system
Blink 68	Fuel de-rate			Atlas Copco QAS generator set with JDEC system
Blink 69	Engine coolant temperature high – most severe			Atlas Copco QAS generator set with JDEC system
Blink 71	Pump control valve closure too long			Atlas Copco QAS generator set with JDEC system
Blink 72	Pump control valve closure too short			Atlas Copco QAS generator set with JDEC system
Blink 73	Pump solenoid circuit open			Atlas Copco QAS generator set with JDEC system
Blink 74	Pump solenoid circuit severely shorted			Atlas Copco QAS generator set with JDEC system
Blink 75	Pump control valve closure not detected			Atlas Copco QAS generator set with JDEC system
Blink 76	Pump solenoid circuit moderately shorted			Atlas Copco QAS generator set with JDEC system
Blink 77	Pump solenoid current high			Atlas Copco QAS generator set with JDEC system
Blink 78	Security violation			Atlas Copco QAS generator set with JDEC system
Blink 79	Internal ECU error			Atlas Copco QAS generator set with JDEC system
Blink 81	Fuel temperature moderately high			Atlas Copco QAS generator set with JDEC system
Blink 82	Engine protection shutdown			Atlas Copco QAS generator set with JDEC system
Blink 83	Auxiliary engine shutdown switch active			Atlas Copco QAS generator set with JDEC system
Blink 88	When reading blink codes, signifies no fault codes in buffer			Atlas Copco QAS generator set with JDEC system
Blown fuse	Alternator does not excite.		Replace fuse.	Atlas Copco QAS246 Gd USA
Blown fuse.	Alternator does not excite	Insufficient residual voltage. Increase the speed by 15 %. No residual voltage.	Replace fuse.	Atlas Copco QAS 186, Atlas Copco QAS 186 GdS USA, Atlas Copco QAS 246 GdS USA, Atlas Copco QAS 306, Atlas Copco QAS 306 GdS USA
Check rpm	Intervention of protection.	Winding failure.	Check windings.	Atlas Copco QAS246 Gd USA
Connections are interrupted.	After being excited alternator does not excite		Check connection cables as per attached drawings.	Atlas Copco QAS 246 GdS USA
H3	Indicación de carga			Atlas Copco XA(S) 186 Dd, Atlas Copco XAHS 146 Dd, Atlas Copco XAHS 186 Dd, Atlas Copco XATS 156 DD, Atlas Copco XAVS 166 DD
H5	Temperatura de salida del motor alta			Atlas Copco XA(S) 186 Dd, Atlas Copco XAHS 146 Dd, Atlas Copco XAHS 186 Dd, Atlas Copco XATS 156 DD, Atlas Copco XAVS 166 DD
H6	Presión de aceite baja			Atlas Copco XA(S) 186 Dd, Atlas Copco XAHS 146 Dd, Atlas Copco XAHS 186 Dd, Atlas Copco XATS 156 DD, Atlas Copco XAVS 166 DD
H7	Fluido refrigerante insuficiente			Atlas Copco XA(S) 186 Dd, Atlas Copco XAHS 146 Dd, Atlas Copco XAHS 186 Dd, Atlas Copco XATS 156 DD, Atlas Copco XAVS 166 DD
Increase the speed by 15 %	Insufficient residual voltage.			Atlas Copco QAS246 Gd USA
Intervention by protection.	Higher than rated voltage at load			Atlas Copco QAS 246 GdS USA
PEP	PROBLEMES MECANIQUES			Atlas Copco 160D LC, Atlas Copco 160X2, Atlas Copco 1984 Telelift TTS-25, Atlas Copco 1990 Kenworth C510, Atlas Copco 1993 International 4900, Atlas Copco 1995 International 4900
Reset voltage	Low voltage at no load.	Voltage potentiometer out of setting.		Atlas Copco QAS246 Gd USA
Reset voltage potentiometer.	Lower than rated voltage at load.			Atlas Copco QAS246 Gd USA
Substitute regulator.	High voltage at no load.	Voltage potentiometer out of setting.		Atlas Copco QAS246 Gd USA
Substitute regulator.	Current too high, power factor lower than 0.8; speed lower than 10 % of rated speed.			Atlas Copco QAS246 Gd USA

Compiled from Atlas Copco service manuals and controller documentation. 11 code numbers mean different things on different controllers; each meaning is listed with the models it applies to. Cause/remedy shown where extracted; always verify against the manual for your exact model.