Spray Gun Trigger Is Released Pressure Washer Cycles On And Off

There a generally two reasons for this on & off cycling to occur:

1. Water leaking from the spray gun or high pressure hose. This causes the TSS module to sense water flow. When it does, it will turn the motor on. Because the water flow essentially stops when the unit is pressurized, the pump immediately shuts off. The fix: replace the spray gun or HP hose.
2. A defective TSS module. Replace the TSS module. See the 112 video on this subject.