Stephen78 Posted February 11, 2023 Report Share Posted February 11, 2023 We have a Duncan EA820-2 that is making a horrible humming sound when switched on. We have replaced the relay however this did not solve the issue. Anyone had similar issues? What do we need to look at replacing or repairing. Quote Link to comment Share on other sites More sharing options...
Bill Kielb Posted February 11, 2023 Report Share Posted February 11, 2023 There are several relays, including two solid state timers. You will need to locate where the hum is coming from. Does this kiln have a three position low, manual, high rocker switch? Quote Link to comment Share on other sites More sharing options...
neilestrick Posted February 11, 2023 Report Share Posted February 11, 2023 Yes, figure out where the hum is coming from. Elements humming is normal. Relays in that kiln should be quiet, as they are not very large. Quote Link to comment Share on other sites More sharing options...
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