![background image](http://html1.mh-extra.com/html/graco/geo-blaster-gb1200/geo-blaster-gb1200_operation-and-parts_2252667021.webp)
Troubleshooting
3A4167C
21
No blast air flow when the blast con-
trol switch is engaged. The water
pump
does not
cycle while the blast
control switch is engaged.
Inadequate air supply.
Make sure the air inlet pressure
gauge reads 100-150 psi (6.8–10 bar,
0.68–1.0 MPa). If the gauge does not
read 100–150 psi, check the air com-
pressor for proper setup.
Emergency Stop is engaged.
Disengage the Emergency Stop.
E
lectric blast control circuit is mal-
functioning.
Inspect the hose cable for damaged
or shorted wiring. Check the battery
and control panel connections. Make
sure the DC power source is 12V.
Check the current flow in the circuit. If
current exists, replace the air relay
assembly.
P
neumatic blast control circuit is
malfunctioning.
S
The blast control switch is not
engaged, but blasting occurs.
Main air regulator is malfunctioning
or is stuck open.
Repair main air regulator.
B
last control tubing is not connected
properly.
Ensure air tubing is routed and con-
nected properly. See “Air Line Tub-
ing” on page 46.
Electric blast control circuit is mal-
functioning.
Inspect hose cable for damaged or
shorted wiring.
Pneumatic blast control circuit is
malfunctioning.
S
Air relay is mechanically hung in
active position.
Engage the e-stop (push it down). If
blasting stops replace the air relay.
Problem
Cause
Solution
Summary of Contents for Geo Blaster GB1200
Page 25: ...Parts 3A4167C 25 Control Panel Components upper left...
Page 27: ...Parts 3A4167C 27 Control Panel Components lower left...
Page 29: ...Parts 3A4167C 29 Control Panel Components lower right...
Page 31: ...Parts 3A4167C 31 Control Panel Components upper right Rear View of Item 48...
Page 33: ...Parts 3A4167C 33 Control Panel Components rear...
Page 35: ...Parts 3A4167C 35 Water Valve and Pressure Relief Valve Components...
Page 37: ...Parts 3A4167C 37 Air Valve Components...
Page 39: ...Parts 3A4167C 39 Water Valve and Filter Components...
Page 42: ...Parts 42 3A4167C Water Pump Components...
Page 53: ...Technical Data 3A4167C 53...