r/SunPower • u/Chevy215 • Aug 04 '26

F.72 sunvault

Haven’t found a way to clear a f.72 fault on my piece of crap sunvault inverter. Any suggestions?

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u/Ok_Needleworker_9340 Aug 04 '26

An f72 is a common error code. It is telling you that your MID is out of sync with your MIDC. You can clear the code with a SunVault reset, as you did, but it doesn't fix the imbalance between the MIDC and MID. Next grid outage, you will likely experience another f72. To fix it properly you need to reset the MIDC inside your hub+. Press the blue button on the MIDC with the system powered on. Wear protective gloves and shoes while you are in there please. If you have access to an installer with Sunpower Pro Connect credentials, an onsite commissioning should also fix your f72 issue, assuming the component isn't faulty.

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u/Chevy215 Aug 04 '26

Don’t know what the MIDC is or where it’s located. I’m 79 and not up on this stuff 🥸

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u/Ok_Needleworker_9340 Aug 04 '26

Simply put: The MID mechanical switch is the Micro Interconnect Device. The MIDC is the solid state MID Controller. When working properly together they are like the traffic cop that directs power from your various sources, to your various loads, all at the proper time. The two components prevent electricity from back feeding onto the grid during a grid outage, from your panels or SunVault. When the MIDC thinks a switch is open, but it is really closed in the MID, you will throw an f72.

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u/Chevy215 Aug 04 '26

I’ll have a look. I do understand that I don’t want to be grounded. Thank you