[Community post] Fuse problems? ERHQ

[pitylee]

Hello community,

Did you guys have problem with fuses on outdoor units? It keeps blowing the F1A ceramic 6.3x32mm fuses, and showing U4 error, and have no idea why it does that.

[raomin]

I'll convert this one to a discussion as it's not really an ESPAltherma issue.

[Tardymo]

Is that a 3-phase outdoor unit you are talking about?

[pitylee]

yes, it has a bunch of fuses that are not even on the technical drawings. after all, it got shorted, and the PCB needed some transistors replaced.