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PROBLEM
Flashing EFI fault indica-
tor light.
Steady ON EFI fault indi-
cator light.
Engine starts and shuts
off right away.
Fault Indicator Codes
The fault (P) code is displayed by a series of
blinks to indicate the code number. There is a
one second pause between blink sequences.
• If multiple failures have been detected, the
fault light will turn off for 2 seconds between
fault codes.
• Once the fault light has flashed all failure
codes, the fault light will turn off for 4 sec-
onds. Then the 4 second End Code light
turns on. After the End Code light, the unit
will repeat the codes up to 10 times, and
then stay lit.
Fault code example:
Fault code P0123 is displayed by, ten blinks = 0, one second pause, one blink = 1, one second
pause, two blinks = 2, one second pause, three blinks = 3, four second pause, four second light
= End code.
There is a one second pause between blink sequences
0 = 10 Blinks - **********
9 = 9 Blinks - *********
8 = 8 Blinks - ********
7 = 7 Blinks - *******
6 = 6 Blinks - ******
5 = 5 Blinks - *****
4 = 4 Blinks - ****
3 = 3 Blinks - ***
2 = 2 Blinks - **
1 = 1 Blink - *
End Code = 4 Second Light
20
CAUSE
1. Engine may or may not run
depending on severity of fault.
1. Engine may or may not run
depending on severity of fault.
1. Automatic COsense® shut-off
due to accumulating carbon
monoxide (red light) on side
panel.
2. Automatic COsense® shut-off
due to a system fault (yellow
light) on side panel.
1. Contact IASD.
1. Disconnect battery to reset
ECU. Contact IASD.
1. Follow all safety instructions
and relocate generator to an
open area outside, far away
from windows, doors and
vents. See
2. Start generator to confirm yel-
low light blinks when/if gener-
ator shut-off. If COsense®
fault continues, contact IASD.
• Once the fault(s) have been resolved, dis-
connect and reconnect the battery. The
ECU will automatically reset and stop flash-
ing fault codes.
Call Generac Customer Service at 1-888-
GENERAC (1-888-436-3722) for assistance.
Fault (P) Code Example
********** (0)
* (1)
** (2)
*** (3)
Four Second Pause
Four Second Light
Owner's Manual for Portable Generator
CORRECTION
COsense®
.
P
Fault Code
P0123
End Code
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Troubleshooting
Need help?
Do you have a question about the XT8500EFI and is the answer not in the manual?
Questions and answers
what is the part with the copper posts that the positive and negative battery cables hook up to, broke the post and need a replacement part
The engine running but there's no electrical output
The Generac Power Systems XT8500EFI engine may be running but not producing electrical output due to the following possible causes:
1. Circuit breaker is open – Reset the circuit breaker.
2. Poor connection or defective cord set – Check and repair the connection or replace the cord set.
3. Connected device is faulty – Connect another device that is known to be in good condition.
4. Fault in the generator – Contact an Independent Authorized Service Dealer (IASD).
5. GFCI breaker module is open – Correct the ground fault and press the reset button on the GFCI breaker module.
These steps can help diagnose and resolve the issue.
This answer is automatically generated