Thetford N3000 Series Troubleshooting Manual page 16

Error code 12: Display board and power board lose
Yes
Measure on the display board
between white and green. Is
there +/- 5V?
Yes
Measure on the display board
between the yellow (+)and
green(-) wire on AC. Is there a
pulse that is going on and off
between 0.5 and 0.7 VAC?
No
Production date of the fridge?
communication with each other.
Replace cable
No
between
power- and
display board
Yes
Contact
Thetford
Before 22-6-2015?
Serial number < E173S....
After 22-6-2015?
Serial number >/= E173S.....
N3000 - series
No Yes
Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
Replace power board assembly
(691101)