Galanz countertop microwaves (compact and retro, 0.7-1.2 cu ft): quick sheet

Covers: Galanz-branded countertop transformer microwaves sold at big-box retailers (e.g. GLCMKA07 retro 0.7 cu ft, 700 W; 1.1-1.2 cu ft models). Galanz also builds microwaves sold under other brand names; check the rating plate.

Single sourceBrands: Galanz7 components

Low-cost transformer microwaves with membrane keypads. Repair economics are tight: door switches, line fuse and turntable issues are worth fixing; a magnetron, transformer or control board on a 0.7 cu ft unit usually is not. Child lock ('L' on display, held Stop/Clear about 3 s on several Galanz models) causes many 'dead keypad' calls.

Safety first

The high-voltage capacitor can hold a lethal charge after unplugging; discharge and verify before any internal work.
Never operate with the wrap off or interlocks defeated.
If the repair cost approaches the price of a new compact microwave, recommend replacement.

How it works

Mains passes the line fuse, thermal cutouts and door interlock switches to the control board relays; the HV transformer, HV capacitor and diode feed the magnetron.

Interlock switches are arranged so a failed monitor switch blows the line fuse; a blown fuse after a door switch fault is the classic pattern - replace both and test all switches.

Turntable motor runs on line voltage whenever the oven runs; the glass tray sits on a roller ring over the coupler.

Components & tests

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): White countertop microwave on a kitchen counter by cottonbro studio, Pexels License

Diagnostic guides for this appliance

Guide · Microwave

Over-the-range microwave vent fan turns on by itself or won't turn off

Most OTR microwaves have a heat-protection thermostat that starts the vent fan when the cooktop below heats the unit, and on that cycle the fan cannot be switched off until the area cools. Some models also run the fan during and after microwave cooking or link the hood to the cooktop. If the fan runs in a cool kitchen, right at power-up, or for hours, suspect a thermostat stuck closed, a welded fan relay on the control board, a stuck vent key or a shorted wire.

8 steps ~45 minmoderate

Guide · Microwave

Microwave keypad locked or in demo mode (keys dead, or runs but doesn't heat)

Two software modes cause many no-fault calls: control/child lock and demo (showroom) mode, which runs everything except the magnetron. Clear them with the model's key sequence before any high-voltage diagnosis.

6 steps ~10 mineasy

Guide · Microwave

Known issue: Whirlpool WMH53520 / WMH73521 over-the-range microwave internal arcing (2016 recall)

In August 2016 Whirlpool recalled about 15,200 Whirlpool microwave hood combinations, models WMH53520 and WMH73521 (CS, CW, CB, CE, CH) with serial numbers TR33500000 to TR34899999, sold January 2014 to April 2016. Internal arcing during use can ignite an internal plastic part. The published remedy was a free replacement microwave. Units of this age are still installed in many homes and rentals.

6 steps ~20 mineasy

Other microwaves manuals

Manual · Microwave

LG LMV2031 / LMV1831 / LMVM2033 over-the-range microwave: quick sheet

LG 30-inch over-the-range microwaves LMV2031 (2.0 cu. ft., suffixes such as ST, SS, SB, SW, BD), LMV1831 (1.8 cu. ft., ST, SS, BD) and LMVM2033 (2.0 cu. ft., stainless). Transformer-type (non-inverter) units with a hidden vent grille, glass touch controls and a turntable, sold roughly 2015-2022; most are now listed as discontinued. LMHM2237 (2.2 cu. ft., taller cabinet, ExtendaVent 2.0) is a different, larger chassis: the fault logic below still applies, but check its own parts list before ordering anything.

10 components7 common failuresLG

Manual · Microwave

Frigidaire FFMV1846V / FFMV1645T / Gallery FGMV176NTF / FGMV17WNVF over-the-range microwave: quick sheet

Frigidaire 30-inch over-the-range microwaves: FFMV1846V (1.8 cu. ft., suffixes VS, VW, VB, VD), FFMV1645T (1.6 cu. ft., TS, TW, TB, TD, TM), Frigidaire Gallery FGMV176NTF (1.7 cu. ft.) and FGMV17WNVF (1.7 cu. ft.). Transformer-type units with a bottom grease filter, 2-speed vent and a turntable, sold roughly 2014-2021 and now discontinued (FMOS-series replacements). Factory revisions are shown by the last letter of the serial model (for example FFMV1846VSA/VSB); parts differ between revisions, so always order by the full model number.

10 components7 common failuresFrigidaire

Manual · Microwave

Countertop microwave (transformer type): field service manual

Conventional countertop microwaves that use a heavy iron-core high-voltage transformer, an HV capacitor and an HV diode (most GE, Whirlpool family, Samsung, LG, Frigidaire, Sharp and private-label countertop units). Over-the-range units use the same HV circuit; see the OTR manual for the vent system.

10 components8 common failuresAll