Norcold 1200LR

[Raybo]

How many times can you hard reset the control. Can't get it to reset again. Over time I reset it 4 times

[Old-Biscuit]

You have been messing with this (no co') for several days. ....since the 29th

YOUR cooling Unit is BLOCKED.

You will need to replace cooling unit or fridge.

Off level operation will KILL a cooling unit .....DEAD!



OK..rant off
Did you short the board (burn it out) when you did the last reset?

Have you ever pulled the thermistor leads and checked the resistance on it........a bad thermistor will cause a 'no co' fault due to lack of temp sensing

When trying to reset you do have 120V AC leads plugged in, 12V DC power leads plugged in, spark electrode wire in place, gas valve solenoid leads plugged in and fridge turned ON...correct

[Raybo]

Being on the road I purchased a 4cu ft electric unit. Yes I had all items plugged in. Before I did the reset. It reset twice. An after running some time no co came back on. I did check the thermistor it was replaced two years ago an is ok. I did not know since the control knows it was not the first reset if it also had a limit on reset can be done. Thanks

[StevieG]

When you say "hard reset", I assume you mean using a jumper in the board? When I had a problem, I reset it several times. Eventually, I came to the conclusion... Before smelling the ammonia and seeing a yellow residue that my cooling unit was junk. Make sure your fans are running and that you have plenty of air circulation behind the fridge as that can cause the "no co" code...

[Raybo]

To finish this. When I got home from Maine I tested refrigerant unit heating elements. There 64 olms and 225 watts each. They were very close to 64 olms. I removed the black plastic cover from control board an connected both elements to 110 volts. Checking the watts both was plus or minus 10% of 225 good. Left this run over night. After 2 hrs the unit was getting cold. Next morning unit was 30 deg. This proved the refrigerant system was working an my door seals are good. Now checking control board why it would not hard reset. I was using a multi wire wire to try to reset it. The first couple of try's it made contact through the plug then the wires bound up an was not making contact. After I found this out an used a single wire it reset and it all works now. Infro about running a unit out of level. About 20 yrs ago the manufacturers made the tube that clogs up a larger diameter it can still happen but it is not common as it was. The reason for hard resetting is there is a thermistor attached to the right side of inside cooling fins. If this does not feel a drop in temperature in a certain time it will lock out the board