Troubleshooting Tests; Error Code 18; Unit Not Able To Start; Test A - Norcold N3104 Series Service Manual

Error Code Tests, cont'd.
Be sure you have followed the "Diag-
NOTICE
nostic Pre-Checks" before continuing.
Once the problem is corrected, you
MUST power the refrigerator off and
on to clear the fault code display.
START
Is incoming 12VDC in range?
( 10.0V < 15.0V )
Yes
Turn unit off and on. Does code 18 appear?
Yes
Is production date of unit before Jan. 4,
2013?
Yes
Replace power control board and LCD
display.

Troubleshooting Tests

Be sure you have followed the "Diag-
NOTICE
nostic Pre-Checks" before continuing.
Once the problem is corrected, you
MUST power the refrigerator off and
on to clear the fault code display.
Is input at DC HC poles of power board > 12V
when the 12V heater is enabled?
Yes
Is the input at the heater conne on 12V?
Yes
Is DC heater resistance in range?
N3104: .74 + .2 Ohm
N3141 / N3150: .68 + .2 Ohm
Yes
Is DC heater properly installed?
N3104, N3141, N3150 Models
No
No
No
Replace power control board.
START
Start the vehicle. Put the unit in
Manual DC
No
e of unit prior to
Jan. 4, 2013?
No
No
16
DC input issue.

Error Code 18

Problem solved.

Unit not able to start

Correct DC input.
Replace power control board.
No
Replace power control board and
LCD display board.
Yes
Replace DC heater.
Install DC heater properly.

Test A

Does not cool
properly in
DC mode