Norcold low dc beeping

I fixed it. there was a large circuit board on the opposite side of the rv in one of the storage compartments that houses a ton of fuses, relays and breakers. The schematic on the board cover showed a 5 amp circuit breaker for fridge. When I put a test light on it, one side was bright and the other dim. I figured corrosion on the terminals could be it, so I cleaned it and all is good now.

"dc" "LO" Fault Code –dc voltage input to power board is lower than 10.5 volts


Before beginning this procedure: Make sure RV DC voltage to refrigerator is at least 10.5 and no more than 15.4 volts. Determine if the "dc LO" fault code displays when the converter is the source of DC power. Make sure no other appliance or lighting circuit is connected to the refrigerator DC circ



Electronic controls operate on 12 volt DC. When an AC/DC converter is used to supply DC power, the refrigerator circuit must be connected to the appliance output terminals of the converter (filtered side).
If the refrigerator circuit is connected to the unfiltered side, the AC ripple generated by the converter may cause a "dc LO" fault code to display.
To troubleshoot a "dc LO" fault, connect a charged 12 volt automotive battery to the power board. If the "dc LO" code clears, the fault was caused by unfiltered DC power.
If the "dc LO" code does not clear, replace the power board (

mobilefleet wrote:
Norcold 1200 LRIM model. Beeping low dc but stops when i open either fridge door. House battery shows 13.6 with rv running and it is beeping with rv running. It starts beeping again a minute or so after door is opened and closed. Any ideas?

It would be nice if you could let us know how this was fixed. It might be helpful to others.

dougrainer wrote:

mobilefleet wrote:
Norcold 1200 LRIM model. Beeping low dc but stops when i open either fridge door. House battery shows 13.6 with rv running and it is beeping with rv running. It starts beeping again a minute or so after door is opened and closed. Any ideas?

If you leave the doors open for more than a minute, what beeping or indicator do you get? 1200 models have a beeping that will indicate if the door light switch is NOT closed. You have to adjust the door up to stop that indicator. The 12 volt power MUST be read at the input to the refer, not just what the house battery shows. The refer is sensing lo DC voltage, so check the voltage at the refer 12 volt input with a digital voltmeter. When you open the refer door, the rear fans also stop and that may mean the voltage is just at the minimum. When you close the door those 2 fans start up again. Doug

if I leave doors open it turns off. not sure whats wrong but thinking maybe control board at the back of the fridge?

I had mine do that once. The tech pulled the 12 volt wire from the power board(?) or what ever it's called. Then unplugged the 120 volt fridge supply cord. Waited a minute or so, then plugged all back up. Still working....

Does it alarm when using shore power or just on battery power?

Just on battery.......check 12V DC (+/-) connections on power module and the DC fuse holder on power board. Make sure they are clean/tight connections.


Hopefully it just a poor connection causing high resistance and not the power board.

mobilefleet wrote:
Norcold 1200 LRIM model. Beeping low dc but stops when i open either fridge door. House battery shows 13.6 with rv running and it is beeping with rv running. It starts beeping again a minute or so after door is opened and closed. Any ideas?

If you leave the doors open for more than a minute, what beeping or indicator do you get? 1200 models have a beeping that will indicate if the door light switch is NOT closed. You have to adjust the door up to stop that indicator. The 12 volt power MUST be read at the input to the refer, not just what the house battery shows. The refer is sensing lo DC voltage, so check the voltage at the refer 12 volt input with a digital voltmeter. When you open the refer door, the rear fans also stop and that may mean the voltage is just at the minimum. When you close the door those 2 fans start up again. Doug

newman fulltimer wrote:
ur door is not sealing properly

I Believe you mean NOT LATCHING correctly. There is no indicator of a refer door not sealing correctly. Doug

ur door is not sealing properly