Brand: SAMSUNG
Category: Microwave Oven
Document Type: Manual
Language: EN
Manual for ME18H704SFB/AA
Uploaded: Nov. 21, 2025, 6:18 p.m.
Manual Publish Date: 2016-07-01
Warranty Information
This manual does not contain warranty information.
This manual provides detailed instructions for servicing and repairing Samsung Microwave Ovens, specifically models ME18H704SFB/AA, ME18H704SFW/AA, ME18H704SFS/AA, ME18H704SFB/AC, ME18H704SFW/AC, and ME18H704SFS/AC. It covers essential safety precautions, product specifications, disassembly and reassembly procedures for various components, alignment and adjustment guidelines, troubleshooting steps for electrical malfunctions and error codes, PCB diagrams, wiring diagrams, and schematic diagrams. Special emphasis is placed on high voltage safety and microwave leakage testing.
Troubleshooting and error codes
| Cause | Correction |
|---|---|
| Oven is dead. (No display and no operation at all.) | |
| Fuse is OK (Yes) | Open or loose lead wire harness Open thermal cutout (Magnetron) - Check fan motor when thermal cutout is defective. Open low voltage transformer - Check Ass'y PCB when L.V.T is defective. Defective Ass'y PCB |
| Fuse is OK (No) | Shorted lead wire harness Defective primary latch switch (NOTE 1) - Check adjustment of primary, interlock monitor, power relay, door sensing switch. Defective monitor switch (NOTE 1) - Check adjustment of primary, interlock monitor, power relay, door sensing switch. Shorted H.V.Capacitor Shorted H.V.Transformer (NOTE 2) - When H.V.Transformer is replaced, check diode and magnetron also. |
| Oven does not accept key input (Program) | |
| Oven does not accept key input | Key input is not in-Sequence - Refer to operation procedure. Open or loose connection of membrane key pad to Ass'y PCB Shorted or open membrane panel Defective Ass'y PCB - Replace PCB main. |
| Timer starts countdown but no microwave oscillation. (No heat while oven lamp and fan motor turn on.) | |
| Timer starts countdown but no microwave oscillation | Latch switches out of alignment - Adjust door and latch switches. Open or loose connection of high voltage circuit especially magnetron filament circuit (NOTE) Defective high voltage components H.V.Transformer H.V. Capacitor H.V.Diode, H.V.Fuse Magnetron - Check high voltage component according to component test procedure and replace if it is defective. Open or loose wiring of power relay Defective primary latch switch Defective power relay or Ass'y PCB - Replace PCB main. |
| Oven can program but timer does not start. | |
| Oven can program but timer does not start | Open or loose wiring of secondary interlock switch - Adjust door and interlock switches. Primary interlock out of alignment - Adjust door and interlock switches. Defective secondary interlock S/W |
| Microwave output is low. (Oven takes longer time to cook food.) | |
| Microwave output is low | Decrease in power source voltage - Check power source voltage. Open or loose wiring of magnetron filament circuit. (Intermittent oscillation) - Check H.V.Capacitor, Magnetron and H.V.Transformer. Aging of magnetron - Replace the defect parts. |
| Fan motor turns on when plugged in. | |
| Fan motor turns on when plugged in | Loose wiring of door sensing switch - Adjust door and interlock switches. Check the connection of interlock switches. Check the interlock switches, and PCB main. Replace the defect parts. |
| Oven does not operate and return to the plugged in mode. | |
| Oven does not operate and return to the plugged in mode | Defective Ass'y PCB - Replace PCB main. |
| Loud buzzing noise can be heard. | |
| Loud buzzing noise can be heard | Loose fan and fan motor - Tighten screws of fan motor. Loose screws on H.V.Transformer - Tighten screws of H.V.Transformer. Shorted H.V.Diode - Replace H.V.Diode. |
| Turntable motor does not rotate. | |
| Turntable motor does not rotate. | Open or loose wiring of turntable motor. Defective turntable motor - Replace turntable motor. |
| Oven stops operation during cooking. | |
| Oven stops operation during cooking | Open or loose wiring of primary interlock switch - Adjust door and latch switches. Operation of thermal cutout (Magnetron) |
| Sparks. | |
| Sparks | Metallic ware or cooking dishes touching on the oven wall - Inform the customer: Do not use any type of cookware with metallic trimming Ceramic ware trimmed with gold or silver powder also causes sparks |
| Uneven cooking. | |
| Uneven cooking | Uneven intensity of microwave due to its characteristics - Wrap thinner parts of the food with aluminum foil. Use plastic wrap or cover with a lid. Stir once or twice while cooking foods such as soup, cocoa, or milk. |
| Noise from the turntable motor when it starts to operate. | |
| Noise from the turntable motor when it starts to operate. | Noise may result from the motor - Replace turntable motor. |
| Error Code List | |
| Gas Sensor | Cause and conuntermeasure |
| -SE- | Key short error(10 sec.). Replace assy control panel or smart board. |
| E-11 | Sensor open error. Check unplugged sensor, wiring or smart board. If necessary, replace sensor. If error code appears when starting sensor function, replace smart board. |
| E-12 | Sensor short error. Check shorted sensor or smart board. If necessary, replace sensor. If error code appears when starting sensor function, replace smart board. |