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Our 2000 A1.1 intermittently trips its MCB and blows its 13amp fuse in the wall outlet. Only once early on did it trip the consumer unit RCD and not since. It seemed to happen when the fan oven was on and triggered by shutting the oven door sharply so I changed the fan element, without success. It was not damaged and was electrically sound.
I could not reproduce the fault with only the oven light on so, today I banged the fascia near the oven function selector / commutator. Only when I had the thermostat turned active despite no oven function being selected could I create the fault. I had thought the next candidate was the commutator but this made me wonder if the thermostat itself was at fault but surely that would either short to earth or keep power on to the oven continuously and overheat.
Does the power only go to the commutator when the thermostat is “active”? That would explain things quite well if the commutator is the problem.
Is an internal short in the thermostat a possible cause or not? -I think it only has two terminals and an earth.
Has anyone come across this before and what was the answer?
Any thoughts as to isolate the problem further or am I best just changing the commutator/selector?
Any advice would be appreciated.
Re: SMEG Opera A1.1 intermittently trips MCB.
Power goes to the changeover switch so long as the clock feeds it usually.
The main oven thermostat ditto but, it should only be energised when the oven is on a function that requires its use.
Same with the safety or fan control stats.
K.
Re: SMEG Opera A1.1 intermittently trips MCB.
OK, so the order should be – clock, changeover switch, thermostats, elements.
How do you suggest that I isolate this fault now?
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