Page 8-4 MAXX 450D/470D/Diesel
HydraMaster Corporation
10/24/02
1.0.Water from exhaust
1.1. The recovery tank has been filled with foam or overfilled with water. Remove
recovery tank lid and inspect. If full, drain tank then inspect high-level shutoff switch for
proper operation. Clean or replace switch as necessary.
1.1.1. If foam is observed in recovery tank, use defoamer on carpet being cleaned.
1.2. Condensation. This will be more pronounced in cool weather and humid climates.
Observe how long this condition persists after starting machine. If it is only until the
machine warms up, it is normal.
1.3. A heat exchanger is leaking. Change the diverter mode switch back and forth between
Divert and Heat Exchange mode. Observe which condition causes water to be expelled
from exhaust.
1.3.1. If water is expelled while switch is in Heat exchange mode, the engine exhaust
afterburner heat exchanger is leaking internally. Remove and test. Replace as
necessary.
1.3.2. If water is expelled while switch is in Divert mode, the blower exhaust heat exchanger is
leaking. Remove and test. Replace as necessary.
Miscellaneous
Troubleshooting
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