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Singer electric furnace is inop. changed out the starting capacitor and unit started operating again for a night then inoperable again. sounds like power is going to the unit but just a buzzing noise.

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  1. Check for 24volts ac at terminals "R" and "C".
  2. Check for 24volts ac at "G" and "C".
  3. Check for 24volts ac at "W" and "C".
  4. Check the temperature of the blower motor.....just want to know if it feels "hot" to the touch.
  5. Will the Blower Wheel spin by hand when you first attempt to turn on the heat?
Let me know your findings. Also, can you provide a model and serial number of your furnace?

Posted on May 03, 2010

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I have an old Intertherm gas-fired furnace, Model MGH-055AB which ceased operating last night. It was quite warm when I arrived home, and when I set the heat up a little, began to hum, but the fan would...


Tom P's answer is generally correct: The motor start capacitor is usually not the problem. However, in some cases, particularly on older furnaces, where there were capacitors of certain make and production run will prematurely fail. This happened in March on a mobile home HVAC unit where both the blower fan and condenser fan motor capacitors failed open circuit. Both caps were of the same Mfg, and production lot.
Here is a suggestion (for you or an electrically inclined friend): Locate a substitute motor capacitor having similar Mfd (or MF) and Voltage ratings. Remove power from the unit. Reach into the blower squirrel cage and spin it to verify that the shaft is not frozen. Pull the wires from the existing capacitor noting color and location. Connect the wires to the substitute capacitor and secure it place. Apply power and turn on the blower. A no start? Motor replacement time.

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Panasonic air conditioning model no cu-v9ckp5 inside unit switches on but no fan operation outside unit starts then after approx 1 min whole thing shuts down again


The outside unit has a fan capacitor and it must be faulty!!! thae capacitor tells the fan to rotate and if the fan does not work then the compressor will shut down due to a high head pressure and temperture!! change the capacitor located in the electrical section of the outside unit and it should work fine...

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Blower motor stopped, there is a medium-loud ''electric buzz'' sound every minute or so as if trying to start the blower motor. Could be relay switch. Last week, I extracted the entire motor and fan...


you have a bad "starting capacitor" .. the capacitor is used to get the motor to start in the correct direction .. when its bad the motor doesnt know which way to turn so it just sits there buzzing until it gets hot .. that trips a thermal breaker in the motor and shuts it off ... when it cools it tries again .. dont let it do that for a long time since you could damage the moter eventually ... the starting cap is a round cyclinder probably mounted close to or on the motor (wires come from it to the motor) .. they are not expensive .. you can take the old one with you to a motor parts place so they can match it up with a new one ..

while the motor is buzzing .. if you spin the blower it will start in whatever direction you spin it ... it will run until its shut off but then wont start on its own again ... changing the starting cap will fix that ..

Aug 18, 2009 | Bryant Heating & Cooling

1 Answer

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sounds like the relay for the unit may be bad, usually if a blower motor goes it stops or has a very loud humm and only goes slow

Aug 03, 2009 | Heating & Cooling

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Ac fan not turning on I can ''stick start it'' but which direction?


The condensor fan should be sucking air from the top and blowing it through the coils, probably a counter clockwise direction. The buzzing/humming sound is confusing to me. A humming sound sounds like a motor that can not turn over to start. A starting capacity would be needed. Just because you changed it out last year does not mean it is good. A buzzing sound sounds like a contactor problem. Contactors buzz and after a while, they will fail. In any case, you can "stick start" the condensor fan PROVIDED you are sure the ac compressor is working (this is for a short and temporary use). Also, you may have a high load duty capacitor that assists in the unit running. This will affect your condensor fan operation if it is not good. Unless you know all the components and operations of ac electrical, I would highly recommend calling out a professional.

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HVAC


Could be a voltage problem, could be the motor or the run capacitor or the start capacitor (if it has one). Gonna need test equipment to diagnose this one. Check the input voltage both at rest and during start/operation. Use capacitor tester to test capacitors. If all else checks good, it's the motor. I bet it's a power supply problem though if you have two different motors with the same symptoms.

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Electric Furnace Trips Breakers


it is normal for a breaker that is run right on the edge (50 amp and your furnance to use 45) to get weak after a while . the first thing you should do is change the breaker with the same type and amp rateing . it should take care if it

Jan 16, 2009 | Heating & Cooling

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