Dometic RM2612..Replaced Thermister, was cooling excellantly, now freezer works well but no cold in bottom of frigg? What may cause this?

During very cold ambient temperatures the refrigerator may stay cold enough to seldom need to operate the cooling unit. The thermister (thermostat) is in the refrigerator and tells the cooling unit when to operate. With the refrigerator staying cold enough because of outside temperatures, the freezer may not be kept cold enough. The Climate Control Switch keeps the light on in the refrigerator when the door is shut so the unit will operate more often, keeping the freezer cold enough. Dometic recommends turning the switch off during warm weather.

Here is a link to a Service manual for RM2612 to RM2852 There is a list of items to check in the manual. Other Manuals and info, HERE I am here should you have questions, Thanks Sea Breeze

Reseal with silicone sealant. Any idea what happened to original sealing?

Make sure it is level, has proper airflow out through top vent. Also check baffle, or stack where flame sits under and blow it out good with compressed air to make sure it's clean. If you smell a hint or strong smell of ammonia, shut it off, it has a leak in cooling unit. If all ok in that area, shut it off, disconnect and plug propane line, disconnect power and remove the fridge. Turn the fridge upside down for a day or 2, then re-install and let it sit 24 hrs before turning it back on. Quite often that will take care of any blockage in flow of cooling liquid, and get things back to normal if cooling unit is still good.

my domestic refrg will not work on electric but will lite on gas. freezer will get cold on gas but bottom will not cool.you can plug refrg in and it will kick the gas off. you unplug refrg on gas will lite.that part of the power board seems to be working.

If your freezer is getting down close to zero degrees (F) then I doubt that your refrigerant is low. The most common cause of the refrigerator section not getting cool (approximately 40 degrees (f)) is a fan that pulls the coils in the freezer into the refrigerator has failed. A very common failure of a cheep little fan motor. Normally that fan is behind a panel in the freezer section at the bottom. Determine where the cold air in the refrigerator section normally enters and the fan will be above there.

It is possible that your cooling unit is failing due to a blockage. The solution used to cool starts at the top of the fridge and works its way to the bottom. If there is a blockage in the cooling unit it could produce the symptom you have explained.

the blower is broken or frozen.you need to defrost and clean it.or the air passages are clog.

Make sure the thermister is attached firmly to the fins in the back. The boards on a Norcold can be reset a service center familiar with this process is your best bet. It takes disconecting the board and then shorting it out best to leave it to some one who is familiar.

The thermister is located in the fridge. Verify it is clipped to the metal fin Think of this as a knob control move it up and down to control the fridge temp. If this does not help most likely you need a new thermister.