Systems Troubleshooting: 8-2
HEATING SYSTEM
1. The truckmount overheats and shuts down
Possible Cause Solution
1.1. Primary orice plate
or lter is clogged
Clean orice plate and lter
1.2. Reduced ow through
heat exchanger
Descale machine
1.3. Dump solenoid faulty Replace solenoid
1.4 RTD sensor not
working properly
Test sensor per the HM RTD Sensor Simulator eld
procedure (164-028)
1.5 Temperature controller
not working properly
Test controller per the HM RTD Sensor Simulator eld
procedure (164-028)
1.6. Faulty sensor Inspect the engine overheat switch and test for
functionality.
2. Unable to achieve normal cleaning solution temperature
Possible Cause Solution
2.1. Temperature control
knob is turned down.
Inspect the knob. Adjust if necessary.
2.2. The thermovalve is
faulty.
Inspect the thermovalve and test for functionality.
2.3. Excessive solution
ow at tool.
The cleaning tool jet is too large or worn. Inspect the jet.
Replace if necessary.
2.4. The heat exchanger
has hard water scale
buildup.
Descale the system.
2.5. The heat exchanger
has blockage on the inlet
side.
Inspect the interior of heat exchanger. Remove the debris
and clean as necessary.
2.6. The heat selector
valve is in the wrong
position.
Move the heat selector valve to the "HOT" position.
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