Fault Finding
Preliminary Electrical Systems Check
Blue Green Yellow PLUG (with cover removed) Earth Wire Green/Yellow
()
FUSE
SOCKET (face view)
E( )
START Isolate appliance and carry out: A: Earth Continuity check.
Neutral Wire Blue
N
L
Blue Brown Green Yellow
NO
YES
Carry out: C: Polarity check.
Carry out: D: Resistance to Earth check.
Electricity supply should now be satisfactory.
Has inlet fuse blown?
NO
YES
A. EARTH CONTINUITY CHECK - Appliance must be electrically disconnected - meter set on W (Ohms) x 1 scale and adjust zero if necessary. a) Test leads from any appliance earth point to earth pin on plug. Resistance should be less than 0.1 W (Ohm), check all earth wires for continuity and all contacts are clean and tight. B. INSULATION CHECK - Appliance electrically disconnected, all switches ON. a) meter set on W (Ohms) x 1 scale. Test leads from L to N in appliance terminal block. If meter reads «0» then there is a short circuit. b) meter set on W (Ohm) x 100 scale. Repeat test with leads from L to E. If meter reads less than ¥ (infinity) there is a fault. NOTE - Should it be found that the fuse has failed but no fault is indicated - a detailed continuity check (i.e. by disconnecting and checking each component) is required to trace the faulty component. It is possible that a fault could occur as a result of local burning/arcing but no fault could be found under test. However a detailed visual inspection should reveal evidence of burning around the fault.
Inlet wiring faulty. Rectify any fault.
Isolate appliance and carry out: B: Insulation check. Rectify any fault including replacing fuses as necessary.
