Norcold 1210 Cooling issues

The 1210 has 2 Electric elements. It is possible 1 is bad. Also, SHORE POWER 120 line voltage is critical for the 120 side to operate correctly. Using a digital multimeter, check your line voltage at a kitchen 120 outlet and post the results. Your Model refer has a built in "defrost" mode for the lower refer section. This will not affect the freezer section. The Mode is built on continuous running. Every 48 to 54 hours the refer will just shut OFF for a few hours and this allows any ice build up on the lower evap fins to thaw and drain out. Then the refer resumes operation. Top STOP this defrost cycle just turn the refer OFF everyday for a few seconds and then restart. This causes the 48 to 54 hour timer to reset. Now, YOUR TRUSTY TEMP GUN IS WORTHLESS, for checking CORRECT temps in a refer. The ONLY true way to check correct temps is to have a small cup/glass of water in the refer for 24 hours and then take a digital thermometer reading of the water after that 24 hours. ICE build up on the evap fins degrades cooling. Ice is an insulator. The Fins of the evap will be 10 degrees COLDER than the interior temp of the items in the refer. If the fins are 26 degrees, the refer items will be 36 degrees. You MUST have a 1 inch air space at the back wall of the refer to allow convection air to flow UP the back wall, thru the evap fins(removing the heat). These are numerous suggestions to help you determine the problem you may be having. Doug