PROBLEM
PROBABLE CAUSE
(The most recurring probable cause is listed first)
REMEDY
(Repairs should only be made by a qualified technician)
Pumping System
Trigger gun leaks or will not shut off
Debris in gun valve assembly.
Clean valve assembly or replace gun.
Pump runs but has low spray pressure Water turned off.
Nozzle is not installed, is plugged, or sized incorrectly
Inlet chemical injection valve is open without the end of the
pickup tube inserted into detergent.
Coil on hot water machines is obstructed.
Priming of pump after run dry.
Dual wand valve is open.
Leaky discharge hose or quick coupler. Water sprays out
around nozzle.
Inlet strainer clogged.
Belt slippage.
Unloader valve worn or improperly adjusted.
Air leak in inlet plumbing.
EZ start valve is leaking.
Turn water on.
Install nozzle, clean or replace with proper size
Close soap valve or submerge detergent pickup tube into solution.
Clean obstruction or scale deposits from coil with coil cleaner.
Crack open fitting on high-pressure outlet of pump.
Close dual wand valve and install high-pressure nozzle.
Replace hose, quick coupler, or o-ring in the quick coupler.
Clean and check more frequently.
Tighten or replace with correct belt
Install pressure gauge on pump head to adjust pressure.
Check valve seat on unloader.
Reseal fittings and inspect inlet hoses for air leaks.
Pump runs but there is erratic,
fluctuating pressure
Inadequate incoming water supply.
Stuck inlet or discharge valves.
Restricted inlet or air entering the inlet plumbing on pump.
Leaking High Pressure seals
Leaking Low Pressure seals
Remove hose to check for internal leaks. Increase water supply flow.
Clean out or replace worn valves.
Check fittings and hose for airtight seal, clean inlet strainer screen.
Replace seals.
Pressure feed the pump & replace seals if water leaks from 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/seal.
Water is emitted from the chemical
pickup tube
Check-valve malfunctioning.
Repair or replace check-valve.
Inlet injection will not siphon chemical Check valve in strainer clogged.
Chemical valve not open or clogged.
Strainer not submerged in solution.
Detergent hose cut or kinked.
Clean or replace valve. Rinse after each use.
Open chemical valve or clean.
Submerge strainer and replenish chemical.
Inspect hose, replace as necessary.
Downstream injector will not siphon
chemical
Brass knob on injector is closed.
Unit not in low-pressure mode.
Soap solution is too thick.
Detergent hose cut or kinked.
Strainer plugged or not submerged.
Internal injector parts corroded or stuck.
Outlet water temperature too high.
Open by turning counter clockwise.
Open dual wand or install low-pressure tip.
Dilute or use different solution.
Inspect hose, replace as required.
Check screen on strainer pickup tube.
Disassemble, clean or replace.
Use with cold water (150° Maximum)
Pressure relief relieving water
Un-loader failure/Coil overheating/Excessive pressure.
Turn machine off, wait a few minutes and restart. If problem continues,
take in for repair.
Burst disc relieving water
Excessive over-pressurizing and system spikes.
Take in for system check.
PROBLEM
PROBABLE CAUSE
(The most recurring probable cause is listed first)
REMEDY
(Repairs should only be made by a qualified technician)
Heating / Burner System
– Diesel Fired
(Additional Diesel Fired burner troubleshooting flow chart on next few pages)
Burner smokes
Elevation or altitude
Soot on coil exterior
Exhaust restricted
Air intake restriction
Improper voltage at burner motor
Adjust air band and fuel pressure to compensate
Increase air or decrease fuel. Coil may need cleaning
Remove restriction if obvious. Check for sooted coil
Remove restriction if obvious. Adjust air bands. Check fan
Check generator output if equipped. Check battery or charging system.
Excess carbon monoxide
Too much air
Improper or restricted fuel nozzle
Fuel gun assembly out of adjustment
Adjust air bands
Replace fuel nozzle
Adjust gun assembly location
Burner “Puffs” black smoke
Too much fuel pressure
Not enough air flow
Adjust fuel pressure at fuel pump
Adjust air bands
TROUBLESHOOTING GUIDE
15
