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Posted on Jan 02, 2017
SOURCE: loud humming
If this is an electric resistance heater then there is no power supply or transformer. I had a baseboard heater that would hum loudly and I found there's a wire that runs along the bottom to connect the far end of the heat element to the electrical wiring at the supply end. This wire becomes magnetized from the current flowing through it and vibrates in the channel it runs through. I was able to open this channel and squirt a bit of silicone caulk in to keep the wire from vibrating and the hum is gone.
Posted on Mar 21, 2007
Almost certainly, the component called the "magnetron" has died. This is the valve (tube in the US) which actually generates the microwaves. The loud humming is the transformer that supplies the magnetron being overloaded and/or the magnetron itself. If the rest of the appliance is OK and not too old, the magnetron can be replaced. If you aren't familiar with these appliances, you *must* get this done by someone who understands the dangers of messing with them - if you get it wrong, they can bite! In some countries, only qualified engineers can buy the spare parts. In the UK, the part costs around £40 - £80, depending on the model. If the appliance is more than around three years old, it may be a false economy to repair it as other parts may fail soon after the repair.
Posted on Sep 24, 2007
Is the water filling up and then draining out? Mine did this and a part was broken inside the unit. The part was five dollars and called a lifter. I fixed it myself.
Posted on Apr 08, 2009
411a when i turn on it gos for 1 min then i have too press it on and off 3or 4 times befor it works and it only stays on for 1 min.
Posted on May 21, 2009
bob I had this happen to my Karcher, the pressure seals have blown. $Au200 for service and replacement from karcher dealer. tyhey would not sell the parts for a DFY
Posted on Jun 22, 2009
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