Thetford N3000 Series Troubleshooting Manual page 15

Error code 12: Display board and power board lose
Input DC low current voltage at
the fridge is between 10 V and
15 V
Yes
Disconnect 12V and wait 5 min
(resettable fuse can cool down)
Connect 12 V, still error code
12?
Yes
Check if the pins in the wiring
loom plug are present and not
bent or loose
No
Are the connectors on the
display board and power board
OK?
Yes
Measure on the communication
connector on the power board
(connector with 4 wires)
between white (+) and green(-)
on DC. Is there +/- 5V?
Yes
communication with each other.
No
No
Yes
No
No
No
N3000 - series
DC input issue
non fridge
related
Solved, does
error occurs
again?
Yes
Fix pins if
possible
Restore
connections
Yes