Question about Master Heaters Master B115DT 115,000BTU Fan Forced Air Heater with Thermostat

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When you plug it in asoon as the thermostat kicks on the motor hums then starts and runs bacward. If you spin the fan the correct direction when it is humming it will sart and burn properly. I do live in the states and polarity seems to be correct on my wiring.

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Look for a capacitor. Have it tested, it may be a start capacitor for the motor, which would get it going the right way. Don't worry about polarity on the cap, but you can mark the connections if it looks important.

Posted on Nov 24, 2013

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Looking at the wall thermostat, you will see the fan switch that has two settings: fan auto, fan on.
You will need to place the fan switch in the fan on position for testing purposes.
This will make the indoor fan run continuosly, and never cycle off.
In the fan auto position, the fan will turn off when the thermostat temperature setting has been satisfied.
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If the fan isn't working see if you can listen closely if it is humming, or can touch the motor to see if it is hot.
If it is humming and has a bad capacitor, you can tell this without having an electrical tester by spinning the fan wheel by hand.
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If you find that the fan wheel doesn't turn freely when you try to spin it by hand, the bearings have seized and you will need to find another fan motor of the same size, shaft length , speed , and horsepower to replace the defective motor.
Keep in mind that a humming sound in the air handler COULD be from the transformer instead of the fan motor.
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1 Answer

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Hi simpsonruth1..
In the back of the compressor motor you will see a fan, remove the plastic cover to get to it..
Once you have the plastic cover removed and the fan exposed, plug the compressor in and spin the fan with your fingers...be quick as the fan could cut your fingers if you do not get them out of the way..
If the compressor starts working, then the start capacitor is bad on the compressor...if it does not run then you have motor troubles, either replace the motor or get it rewound.
Please take time to rate me

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The thermostat is not the problem. The motor has a starter capacitot attached that gives the motor a burst of energy to get it going the right direction. It is not doing its job. The motor must be replaced.

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This is could be the capacitor that has failed. The capacitor gives the motor the initial kick in the right direction to get it started. You can confirm it is a failed capacitor and that the motor is still ok by flicking the fan blades with a stick in the direction it should spin just as you switch the pump on. The pump should run normally. You can get them off Amazon or ebay for around 5 Pounds (GBP)

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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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