MAINTENANCE
BLAZER 980073 09/16/02
4-18
PROBLEM CAUSE SOLUTION
Waste tank is full. Empty the waste tank.
Water pressure has not reached
50 PSI.
Turn water pump switch to the override
position. If the unit shuts back down, refer
to the “Loss of Water Pump Pressure” in the
“Troubleshooting” section of this manual.
Engine temperature has exceeded
275°F, triggering the high
temperature switch to shut the unit
down.
Determine the cause of overheating before
restarting the unit. See “Excessive Heating”
in the “Troubleshooting” section of this
manual.
Defective fuel pump. Replace the fuel pump.
Defective upper float switch in the
waste tank.
Disconnect the float switch plugs and
bypass the switch. If the unit starts, repair
or replace the defective float switch.
Fuel shut-off solenoid, (located on
engine) not operating properly.
Test, and replace if defective. Refer to the
Briggs & Stratton Vanguard Service and
Repair Instrictions.
Defective 275° engine high-
temperature shutdown switch.
Test switch. If necessary, replace.
Starter turns over engine, but
will not start
Engine is malfunctioning
Refer to the Briggs & Stratton Vanguard
Service and Repair Instrictions.
Heat exchanger leaks
NOTE: The engine exhaust
heat exchanger will produce
water condensation discharge
at times during normal
operation. DO NOT confuse
this with a leak.
Engine and vacuum exhaust heat
exchanger are damaged from
frozen water
Inspect heat exchanger for leaks. On pre-
heaters visually inspect for damage.
Pressure check both styles after removing
them from the unit. (Maximum test pressure
engine exhaust H.E. 1200 PSI vacuum pre-
heaters 300 PSI).
Loss of temperature
The heat output of the unit is
LESS than normal.
Temperature relief valve on water
box is defective, or stuck.
Clean temperature relief valve and test.
Replace, if necessary.
Engine RPM is low.
Clean temperature relief valve and test.
Replace, if necessary.
Engine exhaust heat exchanger is
carbon-coated on outside of coil.
Soak coil section at a radiator shop. Boil
tank or soak in PROCHEM Industrial
cleaner.
Damaged or plugged radiator core
in vacuum exhaust heat exchanger.
Remove and inspect cores. Replace, if
necessary.
Engine exhaust heat exchanger is
scaled on outside of coil.
De-scale coil. Install water softener if
needed.
Worn bypass manifold, worn or
improperly installed bypass orifice.
Inspect bypass manifold. Repair as
needed.
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