Grunaire F1 error code

[mshynson]

i have two 121-hx units. a few months ago i got a F1 error code on one. replaced the PFC board and problem solved. now i have the same code on the other unit. replaced the PFC but still have the F1 code. all connections look good. any ideas? these units are great when they work......

[mshynson]

still broken. any ideas?

[monkey spanners]

Swap board from good unit to one with fault code, if code goes, new board faulty.
If code stays look for another problem.
We don't get that make over here, what is an f1 code for?

[dante805]

Just got the same code. F1. Did you ever figure it out? Checked all the connections to the unit. Is there a reading or easy way to figure out if its the PCB board? There seems to be 3 boards which one is the PCB? I have a spare unit so can exchange parts pretty easily. Thanks.

[alive2live]

F1 usally means the main boards in the outside unit is bad.
Amcor units were notorious for F1 outside PC board failures. Grunaire is made by the same company.

[alive2live]

Meant to say, it is the main pc board in the outside unit that likely burned out.