After one year the heater stopped working, the fan motor still works, there is/was no dust build up at all, except the coil is pretty crusty in spots. Is it the coil? The thermostat? or the thermostat switch?
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Re: No heat but fan works L5600
If you can see any sign of a crack in the coil (Hot Surface Ignitor/HSI) it is probably bad.
If the inducer fan starts (the small fan) and you don't see the ignitor glow, it is almost definitely the ignitor.
Hope this helps
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These Bionaires (including your 9212 and its taller version, the 9224) have a small temperature safety relay mounted slightly above the ceramic heating elements. Its purpose it to shut off the elements if they overheat, which I would assume would happen if the fan stops working or possibly if the outlet to the front becomes blocked (and these ceramic elements, which are like a radiator core, do get a lot of dust accumulated on the inside which will block air flow). The sensor is a small unit with exposed contacts and if these contacts open (driven by the temperature sensor connected to them) or if these contacts do not have good contact (say by dirt or oxidation build up that makes them effectively fully or partially open) then the ceramic elements will not work. My best suggestion to explain your problem is that the contacts on that safety switch became dirty during storage. The only way to verify that (and possibly repair the unit) requires taking the outside shell off and cleaning the contacts of the safety switch with either a small, fine file (like the old ignition files) or maybe fine emery cloth.
A big problem with these heaters ans well as others is the motor driving the fan. The bearings get stiff from dirt and do not spin fast enough activating the over temp device of the heating element. Check the motor out by placing the unit in fan mode them pull the plug or turn off looking at the fan to see how many revolutions is makes with no power applied. It should rotate like five times or more indicating freeness. If it hals to a stop immediately after power is removed the motor bearings are tight.
If your handy you take apart and oil the shafts using 3inone motor lube. Clean the motor of dust and dirt drop a few drops on the shafts near the bearings then work it in by hand rotating the blades. Do this a few times reassemble then lerripp!!!
Usualy the fan absorb dust and dirt which located on its axis and support ball bearing and this making it more hard to rotate so some times rotate and some times is not. However if you are capapble you desasemeble the motor and clean the shaft axis and lubricated the ball bearings, if its is dificult for you, you can use a lubrican oil in between shaft axis and bearings this can help it run better.
The final solution is to replace the fan motor
I have been without heating for the past month since the fan motor in my ducted gas brivis heater filled the house with smoke.
The guy replaced the fan motor, and then it had the same symptoms as yours.
After a month of various tradesman trying to work it out, it has come down to the "thermal switch" within the unit.
first of all, have the thermostacts been checked,if not they will need to be checked,mainly dust can get into them.
if they have heating elements,ckeck to see if they are all in tact and have no dust on them.if this does not work then you will need new heating elements,which you might not get any more,if this is the case then im sorry to say that new heaters will be needed. i hope this helps and good luck.
Sometimes too much dust around the heating elements can cause the heater to switch off to prevent a fire. Check for dust build up first. You can try using a can of compressed air that can be found at many electronic stores.
the buzzing is normal. there is an element inside the quartz tube much like a filament in a light bulb. as this heats up it starts to move. where you have electrical energy you also have magnetism produced. metal objects vibrate when they are in or within a magnetic field. the element is tungsten wire and vibrates off this magnetic field.
You can reach the fan wheel by using a can of compressed air normally used to clean your compute keyboard. Make sure you hold a vacuum wand close to the heater when doing this to collect the debris. Using a small coffee stir straw, lubricate the end of the fan motor shaft with light motor oil. This will keep the motor alive for a bit longer.