HydraMaster Corporation
Page 9-8: Water and Chemical
Boxxer 421
1.0. Machine overheats and shuts down
1.1. One or both orifices or filter screens are restricted. Remove and inspect. Clean as
necessary. Note: Make sure orifices are not interchanged.
1.2. High pressure dump solenoid is restricted. Inspect solenoid and the hose that
delivers water to it. Clean or replace as necessary.
1.3. Diverter valve is stuck or out of adjustment. Operate diverter valve manually (make
sure exhaust system is cool) to determine if the movement of the valve is restricted.
Repair or adjust as necessary.
1.4. Diverter valve and high-pressure dump solenoid are not functioning. Check the
fuses that provides power to the diverter mode relay and to the temperature controller.
1.4.1. If a fuse is blown, inspect electrical system for worn and shorted wires. Repair or
replace as necessary.
1.4.2. If fuse is good, inspect diverter relay and diverter switch. If either is faulty, replace.
1.4.3. If switch and relay are good, refer to qualified service technician to test temperature
controller and RTD sensor.
1.5. Engine RPM is too high. Check RPM with accurate tachometer and adjust as
necessary to 3000 RPM.
2.0. Unable to achieve normal cleaning solution temperature
2.1. System is in Divert mode or temperature control knob is turned down. Inspect
divert switch and temperature control. Change or adjust.
2.2. Diverter valve is not closing completely. Inspect diverter valve for proper operation.
Adjust linkage as necessary.
2.3. Diverter and hot water dump systems will not switch into “Cleaning” mode. Refer
to qualified service technician to test system.
2.4. Engine RPM is too low. Check RPM with accurate tachometer and adjust as necessary
to 3000 RPM.
2.5. Cleaning solution flow is too great. Measure flow at cleaning tool.
Heating System
Troubleshooting
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