Originally Posted by jdalrymple
During a dry camp this weekend, I found our refer not properly cooling. It was almost cool, but not enough to freeze bottled water completely solid in the freezer. When we got home, I plugged the shore line, and went in for a few hours before cleaning up the trailer, and to check pricing on a new refer. Much to my surprise, when I returned to the trailer, I found the water frozen hard. I tried to new batch of bottles, confirmed that the refer works fine on electric.
Now, after searching the trusty forums I found this thread and help. I speculate, that a recent "upgrade" (replacement) of the valve that switches between full and empty propane tanks, is the culprit. I assume it is supplying a lower flow pressure than the previous regulator.
Is anyone aware of varying pressure models of these valves? My local parts dealer had only this one model one the shelf.
Before you invest any money in another valve, try the following first.
Check the LPG pressure. It should be between 11 and 13 inches of water column pressure. 12 inches is better.
Next, take the burner apart and clean it. That should be done every 4 to 5 years or so. If the burner orifice is partially plugged up, and that's also what you will find, then it limits the amount of LPG that can burn, which in turn means the flame is not hot enough. The result of that is exactly what your describing.
Many owners fire up the reefer before they start their trip, and it checks out fine.
When they get to their campsite, then they encounter what you have. The problem is caused by the trailer bouncing around, which loosens some rust particles within the reefer flue, which falls into the burner and orifice.
Use caution when cleaning the flue, since you will find a spiral piece of metal within the flue. It's purpose is to keep the heat within the flue as long as possible.
When you fire the reefer back up, make sure that the freezer compartment shelf plate, is level. If not, it can also reduce the cooling.
Let us know what you find out.