Norcold RV fault codes

Norcold absorption refrigerators are common in North American RVs. Faults usually show on the temperature display as short text indicators such as "no FL" or "no CO".

Refrigerator

8 flashes
DC input voltage too low. The 12V supply feeding the ref… 9 flashes
DC input voltage too high. The 12V supply to the refrige… 10 flashes
Communication lost between the refrigerator's controls (… AC / rE flashing
The flame-sense circuit on the control has failed, so th… AC HE
AC heater fault. The control cannot run the 120V AC heat… dc LO / dc HI
DC voltage faults. 'dc LO' means the 12V DC voltage supp… dr
Door-open alarm. The refrigerator door has been left ope… F1 / F2 / F3
Indicates an open (blown) fuse on the power board, each … Li OP
The high-temperature limit (thermal) switch has opened, … no AC
No usable 120V AC power is reaching the heater. The cont… no CO
The control board's cooling-system monitor detected that… no FL
The refrigerator tried to run on LP/propane (gas) mode b… Sr / CL flashing
The control detected that the AC relay is stuck in the c…