Your mod can't read the resistance correctly, show "ohms too low" or "ohms too high",it may caused by these points:
1.There's breakdown for the resistance detection component
2.tank screws are not tight down to the mod
3.Loose contact for the tank or mod
Suggestions & Solutions
1.Identify the problem by switching the tank to other mods and fit the mods with other tanks.
A.if the mod works well with other tanks,it should be the problem of the tanks
B.meanwhile it should be the problems of the mod thread part if the tanks works well with other mods.
2.If it is the mod issue, please try to upgrade it if there is firmware updating.
3.Please make sure screws are tight on tank, if you use the RBA coil on your mod.
4.Please screw the tank into the mod nice and tight.