11
Problem Possible cause Solution
No function when On/Off Trigger Switch (1) is operated
Lock-Off Button (2) not depressed
Depress the Lock-Off Button before pressing the On/
Off Trigger Switch
Defective On/Off Trigger Switch
Replace the On/Off Trigger Switch at an authorised
GMC service centre
Water does not ow when Coolant Valve (20) is
operated
Coolant Hose (22) blocked Remove hose and unblock
Water mains tap not open Carefully open tap
Mains water hose does not stay connected to Water
Hose Connector (23)
Mains pressure too high Only slightly open mains water tap
Coolant Valve (20) closed Open Coolant Valve
Incompatible hose (diameter, material, shape)
Use different mains water hose, use adaptor, or secure
connection with hose ties or jubilee clip
Troubleshooting
263288_Z1MANPRO1.indd 11 13/10/2015 11:48
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