A full power test is a simple but powerful diagnostic step that helps you verify whether your kiln’s relays and elements are functioning correctly. While it’s not the right solution for every error code or firing issue, it’s extremely useful when you need to determine if all elements are energizing as they should.
When to Use a Full Power Test
Use this test only when you need to confirm relay performance or assess element health. It should not be treated as a universal fix or first step for all kiln errors.
How to Run a Full Power Test
Program your kiln using one of the following methods:
Option 1: Ramp-Hold Program
- Create a 1-segment program
- RA1: 9999 (as fast as possible)
- °F1: 1000
- HLd1: 0000 (no hold)
Option 2: Fast Glaze Program
- Program a cone 04 Fast Glaze firing
Once programmed:
- Leave the lid open.
- Start the firing.
- After 10–20 minutes, visually inspect the elements.
What to Look For During the Test
Observe each element from where it enters the kiln all the way around. You’re looking for consistency in glow and brightness. Here’s what each outcome means:
1. One section of the kiln is dark
Usually indicates a defective relay, since most kilns use one relay per section.
2. One element is not glowing at all
A completely dark element suggests a broken element.
3. Some areas of an element are dimmer
These cool or dark spots are signs of worn elements that may soon need replacement.
4. The top and bottom elements are brighter
This is normal for many kiln models—they’re often designed with hotter elements at the top and bottom to help even out temperatures.
After the Test
Once you’ve completed your observations, turn off the kiln and allow it to cool. Use your findings to determine whether the kiln needs relay replacement, element replacement, or further troubleshooting.
A tutorial video below walks you through the entire test if you prefer a visual guide.
