Question about Samsung SMH7174BC Microwave Oven
After 5 to 10 seconds of use, the lights flash on and off. The display flashes funny (*#@%etc) symbols, unit stops working, and gfi outlet on opposite wall blows.
(If yours is not a Samsung, please reply back with your brand and model!)
Sadly, we hear of this over and over.
This is due to a defective or loose magnetron causing electrical interference and disruption in the control circuit board.
If your magnetron was recently replaced, it may have loose mounting nuts or bolts or maybe the wire mesh RF gasket was not installed or got pinched.
It may also need a new high-voltage diode and stirrer, and the cavity may be affected.
If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa.
If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then your manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.
They may even send you a replacement magnetron.
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 06, 2008
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Posted on Jan 02, 2017
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Mar 03, 2015 | Microwave Ovens
Hey JT Tai, I appreciate your post!
The symbol at the top left hand side of your display could be child lock symbol or vent symbol. If it is the child lock you should be able to press and hold the stop/cancel button down for 3 seconds to release the child lock.
If the light is on for the vent I would seek assistance from a professional for proper diagnosis and repair to be completed on your microwave. I hope this is helpful. -Matt
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