Is it normal for the heating element to hum during operation at lower voltages and currents
1107119
Maybe, you are not lowering voltage, just adjusting freq, which lowers the usuable voltage and watts. If the heater is on a threshold it will him.
1165459
Yes I have experienced that, glad to know it is not my wiring. It is kind of annoying and I guess could be dangerous, but I love the charger and makita tools so I can live with it. also if one expects it then it is not as alarming.
1840631
It is very normal; my electrician explained it to me when he installed the thermostat - nothing to worry about!Donna
311217
When mine goes on, it makes a loud pop and then a very loud and noticeable vibrating noise, like from a coil or something. This dies down after several seconds, and then it runs quietly....until the next cycle. It cycles several times an hour. Have had the unit for 11 months, and it has made these noises the whole time. Negligible effect on my electric bill.
1801640
I have the model with the additional display module. I does get a bit warm. I called PI and discussed this with a tech. He had me measure the OHM rating of the actuator which employs a copper coil and is basically an electromagnet that is in the solenoid the allows power to pass thru the unit. He indicated the some heat is OK.
1561644
I just installed one of these. It does not hum under the sink at all. The Hum around the water heater is very low almost imperceptible. If you put your hand on the unit wjen it's running you can feel the rotor turning but no appreciable vibration. I am very happy with it. One thing you will notice however is at the sink where you have the valve underneath the cold water is warm it takes a long time for that water to get cold for some reason
1155822
This is a very high quality, quiet unit but you can hear the fan running at times. We actually have it in our pantry, so, we don't notice it, but I believe if you had it in a small kitchen, you would hear a low hum.
268489
Mine does not hum, I use it as an automatic transfer switch in the living room, it's been on 24 hrs a day for a month with zero noise. I would return it and try another one.
1220560
I have not noticed any power supply hum at all, it has been an excellent unit for me. It should power a 75 watt radio just fine. It's a 12 amp constant, 14 amp surge power supply, which translates to about 165 watts peak draw at 13.8 volts DC. Source for converting amps to watts: http://www.rapidtables.com/calc/electric/Amp_to_Watt_Calculator.htm
766187
The reason you are hearing the hum is because your transformer plates are slightly loose. The metal plates in the core are laminated and can become separated, you may be able to reduce or eliminate the hum by painting a varnish or shelac onto the core and letting it "soak in". I would suggest several thin coats to do the job. The metal core itself can be loose and vibrate as a whole too so you may need to seal that up the plastic bobbin that the copper windings are wound on. Otherwise if all else fails this unit is quiet, at least the one I got is. You may also try insulating between the transformer and the joist if yours is mountable that way. Hope that helps.
21683
Not at all. It has a couple power/heating indicator LEDs in the front. They are low-power but can be covered up with tape if necessary. In addition, this heating tech is completely silent; no creaking/popping as the elements expand and collapse. The only noise is the click of the relay when toggling power to the elements.
928593
Mine does not have this high pitch you're talking about, just a loud hum, rather like a window air-condition unit. Since it is in my basement, it does not bother me. Maybe you have a bad unit?
357468
Yes, it's normal. Ours clicks also when starting. It's the electrical solenoid activating.
550327
For the most part, yes. There is a very faint hum of the motor and a bit of a trickle. I actually had to go turn one on to see if it made noise as it is not something intrusive at all. I have three of them in our house.
1883393
The heater makes a quite audible hum, like a fluorescent light. Quieter on low, and louder on high. I love this heater except for the hum. I bought it to use in a meditation house and the hum is distracting. I intend to keep it, however, and use it elsewhere because it is a really good heater. But NOT SILENT as some have said.
1313940
Yes, and I asked my Electrician and he said this was normal. I do not know if this is true but I took his word for it. You might want to check with GE
558409
You're experiencing ground loop hum. Try using batteries only. If you still here loud hums, send it in for repair.