failsafe problems ::cause found::

[chris-mr2]

Just installed a hfs-3 system and having failsafe issues
After starting the car the system starts up as it should and dispays everything on the gauge, the green idc led on the controller flikers with engine rpm.
purged the system and linked "sys" and it sprays just fine, test drive done and it also sprays and shows bars on gauge.
but the failsafe light flashes all the time even though the tank is full??
any help would be appreciated