Although the steps below are comprehensive, in most cases, the reason for an Err1 or E-1 are aged elements. You can almost be sure of this if the kiln has been slowing down gradually. At some point in the process of aging the elements just don't have enough power to do their job. The second most common reason is a worn out relay. This is easy to diagnose with the paper test linked below.
Possible Reasons for E-1 (or Err1)NOTE: E- 1 errors read as "Err1" on controls manufactured before 2006
Elements- If you see an E-1 or Err1, then for some reason the kiln could not generate enough heat to counter the heat loss. If one of the elements or one of the circuits in the control fails while the kiln is at a high enough temperature, then it will probably display an Err8 code (which means temperature is falling when it should be rising)
- Err1 or Err8 can mean either you need new elements or a new component in one of