Norcold N611 five blinking error on fridge panel

heres the service manual..



http://rvrefrigeratorrepair.com/wp-content/uploads/2016/08/Norcold-Service-N61x-N81x

Could be lots of things..

The underlying issue could be any of the following:
Poor ventilation
Off-level operation
Dirty burner
Bad thermistor
Low AC voltage
Cooling fan inoperative
Improper installation
Incorrect orifice
Bad cooling unit