Question about Samsung SMH7178STD Microwave Oven
It's almost certainly a bad humidity sensor or "gas sensor" as they also call it.
There may be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.
You can order Samsung parts here.
You can find your nearest Samsung-authorized service center here.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Sep 25, 2008
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Control displaying F3 E0:
There may be a problem with the Oven Temperature Sensor, or the associated wiring.
Power unit down by turning off the circuit breaker(s) for one (1) minute.
Power unit up by turning on the circuit breaker(s).
Monitor the oven for one (1) minute to ensure the error code does not display again.
Verify oven operation.
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