(TROUBLE 2) Oven does not operate at all, Display window does not display any figures, and no input is accepted.

CONDITION

1. Fuse blows.

CHECK

RESULT

Check continuity

Continuity.

of monitor

 

switch (with

 

door closed).

No continuity.

 

Replace fuse

 

Check continuity

Continuity.

of primary

 

switch (with

 

door opened).

No continuity.

 

Disconnect one

Normal.

side of the wire

 

lead connected

 

from transformer

Fuse blows again

to the high

 

voltage

 

capacitor and

 

operate the unit.

 

CAUSE

Malfunction of the monitor switch.

Shorted contact at the primary switch.

Defective high voltage capacitor.

Defective high volt- age transformer.

REMEDY

Replace fuse, primary, monitor switches, and RELAY(RY2) of P.C.B Assembly.

Replace fuse, primary, monitor switches, and RELAY(RY2) of P.C.B Assembly.

Replace high voltage capacitor.

Replace high volt- age transformer.

2.Fuse does not blow.

 

Check continuity

 

 

 

No continuity.

 

 

 

 

 

 

 

 

 

of thermostat.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Continuity.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check continuity No continuity. of power supply

cord.

Defective thermostat.

Defective power supply cord.

Replace thermostat.

Replace power supply cord.

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Whirlpool 721.663398 manual Fuse blows

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