Kiln Not Firing

Check main electrical supply switch

• Fuse blown / breaker tripped
• Cable connection failure

Check kiln controlling contactor

• Loose connection
• Contactor failure

Check kiln door / lid switch 

• Switch switched on
• Switch incorrectly engages
• Switch failure

Check Controller

• Controller not switched on
• Loose connections
• Controller faulty
• Thermocouple circuit inoperative
• Fuse in controller blown

Kiln Does Not Reach Temperature 

• Heating element failure
• Heating element broken in chamber
• Heating element broken at connection with electrical supply cable to element
• Ageing elements
• Too much weight of product and kiln furniture
• Programmed heating rate set outside the kiln capabilities
• Top bung left out during the total up cycle
• Badly fitting (worn) top bung
• Worn door seals

Uneven Heating 

• Heating element(s) faulty
• Top bung left out during the total up cycle
• Badly fitting (worn top bung)
• Worn door seals
• Uneven placing of ware within the kiln chamber
• Too densely packed ware in the chamber

Kiln Over-firing 

• Main control contractor fused in
• Thermocouple pushed back into the insulation
• Incorrect programming for the type of firing being undertaken

Increased Firing Time 

• Ageing elements / broken elements
• Supply voltage low
• Worn door seals / top bung