Hotsy 981SS Operating Instructions And Parts Manual page 18

SYMPTOM
Pressure washer will not
produce hot water.
(continued)
Poor or no detergent flow.
Poor cleaning.
Unloader cycles when
trigger gun is opened or
closed.
Burner smokes or has
obnoxious odor.
Pressure relief valve leaking.
18
TROUBLESHOOTING
TROUBLESHOOTING GUIDE
POSSIBLE CAUSES
Inadequate water supply.
Trigger of trigger gun released.
Thermostat set too low, or defective.
Manual gas valve not open.
Defective gas valve.
Inadequate detergent supply.
Detergent screen or hose clogged.
Clogged detergent injector check
valve.
Improper detergent concentration or
mixing.
Wrong detergent for the application.
Rinsing with hot water.
Detergent valve not opening.
Air in system.
Unloader defective.
Water leak between unloader
valve and trigger gun.
Stack restriction.
Excessive pressure due to
defective unloader valve.
Defective relief valve.
Dirty relief valve.
97-6574 • HOTSY 900-1400 GAS FIRED • REV. 10/05
CORRECTIVE ACTION
Fully open faucet. Check for kinked or
damaged hose. Use 5/8" minimum hose.
Check for debris clogging inlet screen.
Squeeze trigger. Water must be spraying
for burner to light.
Raise thermostat setting. Replace if
defective.
Turn ON gas valve.
Replace gas valve.
Refill detergent container. Ensure that
pick-up screen is fully immersed.
Clean. Always start with a clean detergent
container.
Clean check valve at detergent injector.
Mix detergent per manufacturer's instruc-
tions. Ensure that powdered detergents
are fully dissolved.
Select appropriate detergent.
A final rinse with cold water will reduce
water spotting.
Check that handle or knob is not slipping
on shaft.
Open and close trigger gun several times.
Replace if defective.
Check fittings, hose and trigger gun for
leaks. Repair or replace.
See Venting under Installation.
Replace unloader valve.
Replace relief valve.
Clean relief valve seat.