Repairing and Replacing of Faulty Modules

One of the common causes of malfunctioning of microwave oven is due to non-compliance of user manual instruction or using the appliance inappropriately. Some frequently occurring problems and their causes are given below :

1.
Problems :
Home fuse blows when a power cord is plugged into the wall receptacle

Causes :
Shorted power cord or wireless harness

2.
Problems :
Monitor fuse blows when harness power is applied.

Causes :
1.Shorted power cord or wireless harness
2.Secondary interlock or monitor switch

3.
Problems :
Nothing displays on the the display when powered is plugged in

Causes :
1.Shorted or open wiring
2.Monitor switch or monitor
3.Over temperature fuse
4.Control unit

4.
Problems :
No response after pressing STOP/CLEAR button.

Causes :
1.Primary interlock relay or door sensing switch

5.
Problems
Over lamp does not light with shorted or open wiring opened

Causes  :
1.Monitor fuse
2.Over temperature fuse door
3.Over lamp or socket
4.Control unit
5. Relay (RYI)

6.
Problems :
Over lamp does not light at all

Causes :
1.Shrted or open wiring
2.Over lamp or socket

7.
Problems :
Oven lamp lights, but fan motor and turntable motor do not operate

Causes :
1.Shorted or open wiring
2.Cooling fan motor
3.Turntable motor

8.
Problems :
Over does not go into cook cycle Shorted or open wiring when START button is touched

Causes :
1.Primary interlock system
2.Monitor fuse
3.Magnetron or oven temperature fuse
4.Relay (RYI)

9.
Problems  :
Oven is working but food is not getting heated up.

Causes
1.Shoryed or open wiring
2Agnetron
3.Power transformer
4.Rectifier assembly
5.H.V capacitor
6.Primary interlock system

10.
Problems :
Food is unevenly heated in the cook cycle.

Causes :
1.Shorted or open wiring
2.Turntable motor
3.Low voltage
4.Dirty oven cavity
5.Wrong operation

11.
Problems :
Cooking Power not working properly

Causes :
1.Shorted or open wiring
2.Control unit

12.
Problems :
Defrost function not working

Causes :
1.Magnetron
2.Wrong operation.
3.Low voltage
4.Dirty oven

13.
Problems :
The oven is in the sensor cooking condition but AH sensor condition but AH sensor does not end or AH sensor turns off about off about a maximum of 30 minutes after start.  When a cup of water is heated by sensor, the oven does not shut off when the water is boiling. (This happens in few models)

Causes :
1. Control Unit
2.AH Sensor