frig cooling problem...with a Norcold 821
Please can someone explain me what "mechanically or chemically" goes wrong inside a Norcold 821 for the cooling becoming less efficient ones in a while, despite having good heat, good ventilation and ...
Forum Discussion
The most common failure is the percolator tube will simply get blocked, resulting in loss of circulation. This can be gradual, and is caused by slightly off level operation.
The other failures are gradual loss of hydrogen- can happen through slightly porous welds, and build up of another gas which is given off by overheated sodium chromate, which forces the hydrogen higher and higher in the tubing. You can tell this is the problem if the freezer is still working fine (i.e., zero or below), but the fresh food compartment isn't cooling correctly. This is also caused by off level operation.
You can look at this webpage for a good explanation.
The other failures are gradual loss of hydrogen- can happen through slightly porous welds, and build up of another gas which is given off by overheated sodium chromate, which forces the hydrogen higher and higher in the tubing. You can tell this is the problem if the freezer is still working fine (i.e., zero or below), but the fresh food compartment isn't cooling correctly. This is also caused by off level operation.
You can look at this webpage for a good explanation.
