Having an issue with this unit. Keeps going down every other day. So far has gone down 3 times since 11/25/20. Faults have been ULFB. SHD.
DMFB. SHD.
UMFB SHD.
All of them reset easily and it runs after. Any ideas what I should be looking to or for for the possible issue here? My first impression is these are valve coil/valve related issues. But I have taken apart and cleaned the screens and stem seats. No change in observable operation. Any thoughts anyone?