Gasboy CFN III Mgnr's Mnl V3.4 - Manual (Page 260)

Enabling and Disabling Devices Operating Pumps Manually
Page 244 MDE-4315 CFN Series CFN III Manager’s Manual for Windows NT · August 2004
If this manual-override procedure does not work, chances are the power supply or the relays in
the PCU are bad, and your only choice at this point is to replace them.