HP z820 CPU Air cooling option that are compatible with the air shroud

[DGroves]

exactly what is the bios error message shown? the z820/840 air shroud should have 3 fans installed one fan per cpu and a 3rd one that sits in the corner along with the 3 squirrel cage fans

https://notebookparts.com/genuine-hp-z820-z840-cooling-fans-and-shroud-assembly-684574-001/

the shroud has a multi pin connector  that mate with the motherboard to supply power

with the shroud installed, the mating connectors are located in the top right  

if you look at the link i provided look at the small fan in the top right, along the edge there is the fan connector

i have seen cases where the connectors fail to mate properly causing on or more fans not to spin

[SDH]

EDIT: Corrected the default BIOS setting and the modified setting to bypass use of F1 when encountering a "recoverable error".

There are unrecoverable errors and recoverable errors in HP workstations... DGroves is trying to help you figure out why you have that recoverable error happening, which you can now proceed through by pressing the F1 key.  In some but not all HP workstation BIOS there is an option to automatically bypass recoverable errors without having to use the F1 key. That option is set to "Disabled" in the factory default settings if it exists.

It is best to fix the root cause if possible but here is how you'd bypass the F1 need on a Z820, from the Maintenance and Service Guide. Navigate into BIOS and instead select "Enabled" and save on the way out of BIOS. If you ever reset BIOS to factory defaults you'd again need to reset this from the default of Disabled to Enabled. Here's the path:

I'd work with DGroves a bit more on this but the alternative above is a good option. The terminology in the manuals from the xwX400 through the ZX20 families varies, and I don't think it is there in the ZX00 BIOS.

Bit more HERE . I had a build that needed to use a special video card that always threw the demand for F1 to proceed through boot and setting this option in BIOS to Enabled worked for that issue.