Page 5-6 MAXX 450D/470D/Diesel
HydraMaster Corporation
10/24/02
2.3. System will not switch into “Cleaning” mode. Inspect the two fuses that supply 12
volts to the temperature controller. If they have blown, carefully inspect wiring for damage
before replacing fuse.
2.3.1. If the fuses are okay, refer to a qualified service technician to inspect the temperature
controller and RTD sensor.
2.4. The air pump is not functioning properly. Check the air-flow from the line that feeds air
to the catalytic converter. If there is no (or very little) air-flow, replace the air pump.
2.5. Cleaning solution flow is too great. Measure flow at cleaning tool.
2.5.1. Cleaning tool jet is too large or worn out. Inspect jet. Replace if necessary.
2.5.2. Cleaning solution pressure is too high. Adjust pressure to normal. Inspect pressure
gauge for accurate reading.
2.6. Engine RPM is too low. Check RPM with accurate tachometer and adjust as necessary.
2.7. Heat exchangers have hard water scale build up internally. Descale system.
Chemical System
Troubleshooting
1.0. System will not prime
1.1. Check valves in chemical pump are faulty. Remove valves and inspect. Clean or
replace as necessary.
1.2. Chemical pump diaphragm is faulty. Remove and inspect. Replace as necessary.
1.3. Check valve in high pressure pump (the one that the chemical pump attaches to) is
faulty. Remove valve and inspect. Clean or replace as necessary.
1.4. Filter on feed line in chemical jug is clogged. Inspect and clean.
1.5. Feed line from chemical jug is loose, pinched or cut. Inspect and repair.
1.6. Three-way prime valve is faulty. Check valve for leaks between ports. Replace as
necessary. Note: if the chemical system has been run dry, it is frequently necessary to
insert the prime hose from the chemical jug into the vacuum inlet for a “boost” to purge all
of the air from the system. Machines produced after April, 2001 will have the prime hose
connected directly to the vacuum system.
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