Total PreFill sequence volume is not reached for color (SHA1, SHA2, or SHA3) or catalyst (SHB1) during the 5-minute PreFill sequence.
Check components and clean, repair, or replace as necessary.
Check and repair pump. See pump manual for repair procedures and replacement parts.
Check air line path. See System Pneumatic Schematic, in manual. Verify that solenoid is working.
Increase fluid pressure.