I've just installed a new kitchen consumer unit with RCBOs. The client says the oven RCBO is now tripping when it cools down. Any ideas what could be causing this?
- Mar 9, 2015
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Was the oven on an RCD before the board change?
its possible the element is on its way out. they tend to trip RCD’s when they begin to fail and the closer to failure the more frequent the tripping.
its possible the element is on its way out. they tend to trip RCD’s when they begin to fail and the closer to failure the more frequent the tripping.
Micktw68
Arms
- Feb 7, 2020
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Oven element starting to break down.
Also the old....you touched it last gambit.
Also the old....you touched it last gambit.
The oven was on the same type of RCBO (different manufacturer) before the CU change. Seems odd that it's only tripping when cooling down. Sounds to me like a faulty part in the oven (cooing fan/element issue). Just want to be sure it wasn't the CU change that caused this. Any suggestions?
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Unless you’ve made an error in the Cu swap. Loose termination etc then that won’t be the reason.
W
Wilko
Hi - another vote for the element 
If you wanted to be sure, you could try IR of the circuit when oven is cold. (I’d do L+N to E at 250V to to absolutely certain you can’t hurt any oven electronics or trigger surge protectors etc). If that reading is ok, run the oven up to temp, turn off and redo the same check with oven in the cooling phase. Hopefully this will show it.
If you wanted to be sure, you could try IR of the circuit when oven is cold. (I’d do L+N to E at 250V to to absolutely certain you can’t hurt any oven electronics or trigger surge protectors etc). If that reading is ok, run the oven up to temp, turn off and redo the same check with oven in the cooling phase. Hopefully this will show it.
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Maybe ramp test the RCBO and see what level it is tripping at?
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