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It seems I lost a power from one of phases feeding the panel. The pen tester proofs that. It's interesting if I reset the main switch, the power comes back. If I put any appliance (be it a small light bulb) the power disappears on the same phase until main switch is turned -> off -> on.

I was wondering someone has any theories what could be the issue?

enter image description here

It seems I lost a power from one of phases feeding the panel. The pen tester proofs that. It's interesting if I reset the main switch, the power comes back. If I put any appliance (be it a small light bulb) the power disappears on the same phase until main switch is turned -> off -> on.

I was wondering someone has any theories what could be the issue?

It seems I lost a power from one of phases feeding the panel. The pen tester proofs that. It's interesting if I reset the main switch, the power comes back. If I put any appliance (be it a small light bulb) the power disappears on the same phase until main switch is turned -> off -> on.

I was wondering someone has any theories what could be the issue?

enter image description here

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Lost one phase in main panel

It seems I lost a power from one of phases feeding the panel. The pen tester proofs that. It's interesting if I reset the main switch, the power comes back. If I put any appliance (be it a small light bulb) the power disappears on the same phase until main switch is turned -> off -> on.

I was wondering someone has any theories what could be the issue?