No Co Fault Code - No Cooling Detected By The Controls; Power Board Resetting Procedure - Norcold N109X Series Service Manual

no co fault Code* – No cooling detected by the controls
Fault indicator displayed:
Check for cooling at fin
assembly.
Check for completion of
cooling cycle after resetting
power board.
* For more information on the "no co" fault code, see
pages 30-33

Power board Resetting Procedure

1. Turn OFF the refrigerator.
2. Disconnect the following from power board:
a. 12 VDC positive and negative wires.
b. AC power cord.
c. Solenoid gas valve wires.
d. Spark/sense electrode assembly wires.
3. Remove the power board cover.
4. Reconnect 12 VDC positive and negative wire.
5. Turn ON the refrigerator.
6. Locate Pin 15 on 16 pin connector (P1). Pin 15
is the empty socket to the right of the white/violet
wire on the top row. See Figure 9.
7. Using a 14 AWG size insulated jumper wire, jump
Pin 15 to the power board ground lug for 10 -
15seconds. A click sound will indicate when the
controls reset. See Figure 9.
A jumper wire to jump Pin 15 to ground can be
made from a 8-inch long insulated 14 AWG wire by
stripping 1/2 inch of insulation from each end.
8. Turn OFF the refrigerator.
9. Turn ON refrigerator. If "no co" code displays,
repeat steps 7 - 9.
Refrigerator Service Manual
Cooling
detected?
YES
"no" "co"
code shows
before cycle
end?
YES
NOtE
1-COLD COLDEST-9
MODE
ON TEMP ON-OFF
SET
1. Check for ventilation obstructions
and leveled operation.
NO
2. Reset power board as shown in
Figure 9 and described in procedure
below.
3. Allow unit to operate normally.
Cooling unit is good. Recheck for
NO
ventilation obstructions and leveled
operation.
1. Replace cooling unit if "no co"
shows before completing a full
cooling cycle.
2. Reset power board as shown in
Figure 9 and described in procedure
below.
10. Turn OFF the refrigerator.
11. Disconnect the 12 VDC power positive and
negative wires from the power board.
12. Install the power board cover.
13. Reconnect the following to the power board:
a. Spark/sense electrode assembly wire.
b. Solenoid gas valve wires.
c. AC power cord.
d. 12 VDC positive and negative wires from the
power board.
14. Place refrigerator in service.
Pin 16 To pin 15
White/violet wire
figure 9. Resetting the power board.
Insulated wire jumper
Ground Lug
22 AWG with 1/2" long stripped ends
N109X Models
17