Roger Peryer

Hi everyone many thanks for your replies. It appears that the issue was caused by an incorrectly connected RMII controller. The schematic I was using was for an earlier model. New controller on it's way. Expensive mistake

The lid switch is connected from the RMII controller through to the relays - all 3 are looped together. So when the lid switch is closed the signal is sent to the relays. I had disconnected the neutral from the relays and the same problem exists. Havent replaced the thermocouple, but the clearence from any metal is good. The controller does not have it's own earth connection but is fixed directly to the cover which is grounded.

I have an Evenheat RMII 2329 kiln. It was recently involved in a fire (wall behind kiln caught). I have replaced the RMII controller, the 3 relays and transformer. I believe the elements are all good. When the power is turned on the controller wakes up and all looks correct. However once the lid switch is set there is a loud noise (humming/rattleing) coming from the control panel, this appears to be below the RMII controller in the area of the relays, transformer and main power connection. Once the kiln is turned on it starts heating and the relays start switching between the elements the noise becomes intermittent. One cycle it is there next cycle it goes away. At the same time the controller temperature indicator jumps up and down around 5 degrees. I am an electrician and this has got me compleatly beaten.