Installation guide
Owner’s manual
How big is a Kenmore microwave model 72180403400 in inches?
For Kenmore microwave/hood combo model 72180403400, the overall exterior size is typically about 30 inches wide, 16 to 17 inches high, and 15 to 17 inches deep. For the exact cutout and mounting clearances, use the dimensions and templates in the 72180403400 installation guide.
Use a tape measure and confirm these points before ordering trim, cabinets, or a replacement unit:
- Overall width: left edge to right edge of the microwave case
- Overall height: bottom of case to top of case (not the cabinet)
- Overall depth: front face to back of case (exclude the wall gap)
- Cabinet opening width: inside-to-inside of the upper cabinet
- Mounting height above cooktop: cooktop surface to microwave bottom
These are the common exterior ranges for 30-inch class microwave/hood combos like the 72180403400:
| Measurement | Typical range (inches) | Why it matters |
|---|---|---|
| Width | 29 7/8 to 30 | Must match cabinet span |
| Height | 16 to 17 1/4 | Affects cabinet clearance |
| Depth | 15 to 17 | Affects reach over the cooktop |
Over-the-range microwaves are installed using a wall mounting plate and upper-cabinet hardware. The 72180403400 installation guide shows where the model number label is located and explains the mounting plate location, which helps you confirm you are measuring the correct unit and planning the correct clearances.
- Measure twice and write down all three exterior dimensions.
- Check for rear wall obstructions (outlet, duct, studs) before assuming depth.
- Confirm whether you are venting outside or recirculating; duct routing can change space needs.
- If replacing an older unit, compare the existing mounting pattern to the new one; mounting plates often differ.
Last updated: January 2026
Is Kenmore a good microwave?
Kenmore microwaves are a good choice for most homes because they deliver reliable everyday heating and ventilation at a solid value, especially in microwave/hood combo designs like model 72180403400. The best results come from correct use, proper installation, and routine filter and cleaning care per the 72180403400 owner's manual.
A microwave/hood combo has two jobs: cook food evenly and move smoke and odors away from the cooktop. In our experience, Kenmore units typically perform well when the turntable system, door switches, and ventilation filters are kept in good shape.
Common strengths customers look for:
- Consistent reheating and defrosting for everyday meals
- Built-in exhaust fan and cooktop light convenience
- Straightforward controls for timed cooking and add-a-minute functions
- Long service life when kept clean and not overloaded
These factors matter more than the badge on the door:
- Ventilation setup: Recirculating (charcoal filter) vs. vented outside (ducting)
- Clean airflow: Grease and charcoal filters changed/cleaned on schedule
- Door operation: Door closes firmly; interlock switches work correctly
- Cooking habits: Avoid running empty; use microwave-safe cookware
| Check | What you want to see | What it suggests if not |
|---|---|---|
| Heats a cup of water normally | Strong, consistent heating | Possible high-voltage issue |
| Turntable rotates smoothly | Even cooking | Motor/coupler or tray issue |
| Fan moves air well | Better odor and smoke control | Filter or vent restriction |
| Door closes and latches cleanly | Safe operation | Interlock/door alignment issue |
A microwave can appear to work (lights, fan, turntable) but still not heat if a high-voltage component fails. For model 72180403400, one common service part in that circuit is the microwave high-voltage diode 6021W3B001V. For symptom-based guidance, use why is my microwave not heating.
A “good” microwave is one that heats safely and vents effectively. Following the operating and care guidance in the manual helps prevent nuisance failures and keeps cooking performance consistent.
Last updated: January 2026
How do I find the model number on my 72180403400?
On the Kenmore 72180403400 microwave/hood combo, the model number label is on the oven front. Open the door and look along the upper front area of the cavity opening for the model and serial number label, then copy the full model number exactly.
- Open the microwave door.
- Check the oven front frame around the opening.
- Look near the upper side of the cavity front for the label/plate.
- Wipe the area with a dry cloth so the print is readable.
- Record both the model number and serial number for parts lookup.
Having the exact model number ensures you get the correct Kenmore parts and diagrams for your unit, especially for fit-critical items like door switches, filters, and thermostats.
| You need | Why it matters |
|---|---|
| Model number | Matches the correct parts list and diagrams |
| Serial number | Helps identify production variations |
| Full characters (no missing digits) | Prevents ordering the wrong part |
- Take a clear photo with your phone and zoom in.
- Try side lighting (flashlight at an angle) to make faded text stand out.
- If the label is damaged, use the installation paperwork for the model family and match the full number to your unit.
Microwave/hood combos often share similar-looking cabinets across multiple models; the model number is what separates the correct parts for your 72180403400 from close variants.
For a diagram showing the label location, use the installation guide.
Last updated: March 2026
