Nilfisk-Advance MC 6P Service Manual page 37

Pic. E1: By-pass valve..
SM_MC_6P Ver.2.0_2021
Troubleshooting
Symptom: Machine doesn't start when acti-
vating the spray gun.
Cause: Defective reed switch (3) or stocked
flow piston (2).
Remedy: Replace defective parts.
Symptom: Irregular working pressure.
Cause: Injector nozzle (4) is worn.
1 Remedy: Replace injector nozzle.
2
Symptom: Low working pressure
Cause: By-pass valve kit (1) worn and leaks
3 water.
Remedy: Replace By-pass valve kit.
4
Symptom: Suction inlet for detergent leaks
water. Water flowing back to detergent tank.
Cause: Non return valve (5) defective.
Remedy: Replace non return valve.
5
By-pass valve failures NA6 (NA5)
E
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