Problem | Probable Cause | Remedy |
| Trigger gun leaks or will not shut off. | Debris in gun valve assembly. | Clean valve assembly or replace gun. |
| Pump runs but there is no spray pressure. | Water turned off. | Turn water on. |
| Nozzle is plugged. | Clean or replace with proper size. |
| Inlet chemical injection valve is open, without the end of the pickup tube inserted into detergent. | Close soap valve or submerge detergent pickup tube into solution. |
| Coil on hot water machines is obstructed. | Clean obstruction or scale deposits from coil with coil cleaner. |
| Pump dry, needs to be primed. | Crack open fitting on the high pressure outlet of the pump until water flows out. |
| Pump runs but has low spray pressure. | Nozzle not installed. | Install proper sized nozzle. |
| Dual wand valve is open. | Dual wand valve must be closed and high pressure nozzle installed. |
| Leaky discharge hose or quick coupler. | Replace hose, quick coupler, or O-ring in the quick coupler. |
| Inlet strainer clogged. | Clean and check more frequently. |
| Worn or wrong size nozzle. | Replace nozzle of proper size. |
| Belt slippage | Tighten or replace with correct belt. |
| Unloader valve worn or improperly adjusted. | Install pressure gauge on pump head to adjust pressure. Check valve seat on Unloader. |
| Air leak in inlet plumbing. | Reseal fittings and inspect inlet hoses for air leaks. |
| Pump runs but there is erratic, fluctuating pressure. | Inadequate incoming water supply. | Increase water supply flow. |
| Stuck inlet or discharge valves. | Clean out or replace worn valves |
| Restricted inlet or air entering the inlet plumbing on the pump. | Check fittings and hose for air tight seal, clean inlet strainer screen. |
| Leaking H.P. seals. | Replace seals. |
| Leaking L.P. seals. | Pressure feed the pump and replace LP seals if water leaks from the pump head. |
| Excessive crankshaft play or loud, knocking noise in pump. | Broken or worn bearing or connecting rod in crankcase. | Replace pump or bearing. |
| Oil leaking from pump. | Loose drain plug or damaged seal. | Locate point of oil leakage and replace damaged O-ring or seal. |
| Inlet injection will not siphon chemical. | Check valve in strainer clogged. | Clean or replace. Rinse after each use. |
| Chemical valve not open or clogged. | Open chemical valve or clean. |
| Strainer not submerged in solution. | Submerge strainer and replenish chemical. |
| Detergent hose cut or kinked | Inspect hose, replace as necessary. |
| Water is emitted from the chemical pickup tube | Check valve malfunctioning. | Repair or replace check valve. |
| Downstream injector will not siphon chemical. | Brass knob on injector is closed. | Open by turning counter clockwise. |
| Unit not in low pressure mode. | Open dual wand or install low pressure tip. |
| Detergent hose cut or kinked. | Inspect hose, replace as required. |
| Strainer plugged or not submerged. | Check screen on strainer pickup tube. |
| Internal injector parts corroded or stuck. | Disassemble, clean or replace. |
| Outlet water temperature too high. | Use with cold water (150º Maximum) |
| Pressure relief reliving water | Unloader failure / coil overheating / Excessive pressure | Turn machine off wait a few minutes and restart. If problem continues take to an authorized repair center for complete system check. |
| Burst disk relieving water | Excessive pressure and / or system spikes | Take in to an authorized repair center for a complete system check. |