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Master heater 150btu (b150jt) only works with smaller fan. Won't turn on with original blade. ???? Thanks

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I am not sure what you mean but try the fan switch in the ON position to see if the blowers any good at all, if that works chances are good the low speed/ heat sped is ok too. this will be run by the temperature delay but that is tricky for a novice to mess with.

Posted on Nov 23, 2014

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Posted on Jan 02, 2017

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These run very small motors with low "starting torque" If the fan hasn't been run for a long time, its possible that it has jammed up or got tight from just sitting there. Being careful, turn on the fan and spin it in its usual direction by hand, it should start running. If you cannot spin by hand, it may have seized up which will require you to strip and lube the motor. If you manage to get the fan spinning , let it run on high fan speed for an hour or so, it should free up and then be OK again. A small spray of WD40, CRC or similar spray can lube on the fan shaft where it disappears into the motor may assist.

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1 Answer

Will a smaller blade on a ceiling fan cause problems


Interesting situation.. not many people want to down-size a fan. Anyway, reducing the size of the fan blade shouldn't cause a problem - as long as the pitch or angle of the blade remains the same or is less than the original. Increasing the angle with a smaller blade could actually move MORE air than what the motor was designed to do - resulting in overloading and shortening the motor's life in the best case scenario. Worst case scenario - well, anything for electric devices in a worst case scenario usually involves fire, burns and even death (though not likely to happen).

Prior to starting, make sure all the blades are the same in every way including: length, width, angle and weight. A warped blade can cause wobble, too. Stand on a ladder and spin the fan by hand. Look for a blade that is tipped up or hangs lower than the others. Make adjustments as needed to correct (it may not be possible to correct a warped blade - so be forewarned). If any of the variables listed in the first sentence of this paragraph are different from those of the other blades, wobble and motor noise will result. Neither condition should be allowed to exist longer than absolutely necessary. You can minimize these effects by operating the fan at a slower speed. Generally, the blades should be pretty close in all of these variables - but a wobbly fan indicates an imbalance. Weights placed on fan blades can help correct wobble - but can be tricky to determine which blade is the cause.

Good luck!

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There are 2 fans under the bonnet in my 1993 Mazda 626. One big fan at the front of the radiator, and another...what is the smaller fan to the side for. Whilst the fan mechanism is turning the blades are...


The one big fan is for cooling the water off in the radiator during idle times. While your driving air does that job for the fan. The smaller is for the A/C. When you turn on your A/C it will kick on. If the fan motor is running but the blades are not turning then you might need to replace the fan

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Should the an on my master 150000 btu be hard to spin . My wont run all of a sudden. It keeps tripping the reset button aftera humming sound for a few seconds


the fan should turn freely. those fans have a tendancy to dry out and will trip the reset. if the fan isn't shot completely, try oiling it and working the blades until they loosen up. most of the fans used on these units are not bearing type but brass collars which dry out. if they don't loosen up, the fan is probably too far gone. usually the humming indicates the motor trying to turn the rotor but can't turn the dry rotor shaft or a bent blade stuck on something. good luck jay

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