[Richard L]

OK, It is very clear now.

It appeared the valve has some sort of blockage or the internal seal has swollen. Since this is a recent event as it was working perfectly for 4 months or so.

Possible solutions:
1. Reverse the I/O ports of the FAV and do a "SYS" test. IT might help clearing some debris.
2. What kind of alcohol do you use and at what %?

3. Does the FAV gets warm if you test it for 1 minute. If it doesn't, check the wire connection inside the plug.