Question about Intermatic Malibu 300W Power Pack Transformer ML300RTW

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Transformer hums for a few seconds then goes silent. The lights never come on.

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Posted on Sep 27, 2009

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3 Answers

My compressor comes on for a few second, makes a slight humming sound, then goes silent; any suggestions?


Please realize I'm not a professional compressor repairman.

Your description "comes on for a few second, makes a slight humming sound, then goes silent" leaves me guessing. When you say "comes on" does that mean it "makes the pumping sound of a compressor" or it "Clicks"? Allow my musings.

On a plugged in and turned on compressor the compressor's pressure switch turns on the pump motor when the pressure falls below it's set low pressure threshold (usually ~ 90 psi). The pumps pushes air into the pressure tank until the pressure reaches its high pressure threshold (usually ~ 120 psi). If the compressor is not plugged in or turned on you can hear a click when the pressure switch turns on.

Aside: Leaks, of any sort, make the pumping more frequent or longer. Bad leaks can make it pump continuous because the high pressure threshold is never reached. The leaks can be in the switch, at line connections or in the pump (valves or piston rings) itself.

I once had a low-volume ultra-quiet compressor that made little more noise than a hum when compressing. If yours is not an ultra-quiet (clicks on, hums, and quits) than I'd have to guess that the pump might be binding instead of pumping. If it is binding then the motor would over-heats and shuts off.

Some compressors are oil cooled. If an oil cooled compressor was extremely low on oil would it bind? I suspect so.

If you suspect binding I'd find a parts list for your model to work from and disassemble the pump to investigate. (see link below)

That's my best guess on limited information. Good luck.

Campbell Hausfeld Air Compressor Parts

Jan 16, 2015 | Campbell Hausfeld Extreme Contractor...

1 Answer

Microwave buzzes when off


This is the power transformer humming, sometimes when transformers get older you get vibrations in the windings due to magnetic fields generated within the transformer which causes the humming noise, It's more annoying than anything and won't affect the operation of the microwave.

Mar 06, 2012 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Do I need a transformer if my furnace has HUM port


Yes you still need a transformer the hum. port on the furnace goes to the 24 volt transformer. one leg of the primary side goes to the transformer and the other leg of the primary goes to the neutral on the board. Then you have your 24 volt terminals one goes directly to the humidifier and the other goes to the humidistat the other wire from the humidifier goes to the humidistat.

Jan 25, 2010 | Honeywell HE260A1010 Whole House...

2 Answers

High pitched hum from LNT5265FX when powered off


i'm surprized the set still turns on you have what sound like either a bad Capacitor or shorted Zenor diode in the power supply You really need to have a tech take a look it does sound like you will need a power board replacement

Dec 18, 2009 | Samsung LNT5265FX 52 in. LCD Television

1 Answer

My Karcher just hums for a few minutes then goes silent


http://www.fixya.com/support/t2162702-karcher_electric_press_wash_hums_when

Oct 14, 2009 | Alfred Karcher K255 Electric Pressure...

1 Answer

No audio/video


sounds like fly back failure. high voltage transformer

Aug 12, 2009 | RCA 27V514T 27" TV

1 Answer

Deep Humming Noise


if the noise continues after you power down its the cooling fan

Jan 22, 2009 | Samsung HLR5067WX 50" Rear Projection HDTV

1 Answer

Intermittent "static surges"


Ionic Breeze is no longer supported because Sharper Image went into bankruptcy as a result of these products proving to be ineffective.

Here is a Sharper Image article

Here is an EPA article

Jun 17, 2008 | Sharper Image Professional Plus Ionic...

1 Answer

Humming Noise


There might be something wrong on the volume dial, or the speaker connection.
SOLUTION: Check the speaker cables on the back.

Mar 28, 2008 | Philips FWC577 CD Shelf System

3 Answers

Loud humming coming from subwoofer


This can be caused due to an increase in local interference. The hum is decreased when you plug in the satellites because the interference is spread over a longer area. You may notice that speakers tend to hum around things like cell phones and power outlets. To see if this is the case, move the speakers to another part of the room if you can, slide the desk around, plug the computer in at another room, something like this. If the hum gets louder or quieter, it is interference at your new place. This can be solved by finding a new area to set up your computer stuff at. Since it's mostly the subwoofer, try elevating it off the ground, there may be a power main running under the floor.

Sep 04, 2007 | Audio Players & Recorders

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