Question about Samsung SMH7178STD Microwave Oven
Some keys work some don't
Quite a common problem this. The keypad needs to be replaced. Very seldom but possible that there is an actual pcb fault, but most likely cause is the keypad itself
Posted on May 06, 2014
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Posted on Jan 02, 2017
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The microwave oven may be provided with a self diagnostic routine that can be operated
through the touch pad keyboard. To enter the self-diagnostic routine:
1.While pressing the CANCEL keypad:
a) Open the oven door.
b) Unplug the microwave oven for 2-seconds and plug it back in.
c) Release the CANCEL keypad and close the oven door. You will see the following display.
NOTE: The humidity sensor test results will appear on the display after 8-seconds.If the tests are successful, "OK " will be displayed. If one or more of the tests fail, "ERR " will be displayed.. 2.When a keypad is pressed, a number according to the test chart will be displayed. When no keypad is pressed, a blank "—" is displayed...
POWER FAILURE &FAILURE CODES
Power Failure: After a power failure, the WELCOME screen will be displayed.
F2 —Keyboard Failure: Refer to the Tech Sheet and conduct a touch panel continuity test.
F3H —Humidity Sensor Failure: Refer to the Tech Sheet and test the sensor.
F6 —Microwave Relay Failure: Check the microwave relay.
F7 —Microcomputer Board Failure: Change the microcomputer board.
Oct 18, 2007 | Microwave Ovens
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