SOURCE: Loud buzzing after heating up
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.
SOURCE: Fahrenheat 4000 watt wall mounted heater shuts off and needs reset
the reset is probably an inline circuit breaker. if you can get hold of am amprobe clamp around ammeter, check the current when the unit is running at full power. the reading you get check against the current rating of the inline breaker. your fan motor bearings may be dry increasing the current draw of the unit and tripping the breaker. try oiling the fan bearings with a light oil NOT WD-40.
about the only way I can figure is to let the room get very cool and adjust the thermostat to its lowest setting. now turn on the unit. monitor the heat until the stat just opens. the thermostat bimetal will be closed and will open when the bimetal expands and opens its contacts. another way is to hitch up a chart recorder to measure temperature with its output connected to the heater. [too expensive for you or the DIY to accomplish]
SOURCE: Electric Heater Coils Always On
We use the STW0925H! in 60 rooms on this property and have encountered similar problems that were caused by weldedd contacts on one of two relays that controls the electric strip heat. They can be replaced if needed.
PTHP's and PTACs employ thermal fuses as well as a bimetal limit stat on the heating element to limit risk if fan motor were to fail and the heating element were to remain energized. It would be wise to check that both are fuctioning properly while you are servicing the unit.
SOURCE: Fahrenheat wall heater fan doesn't shut off.
Try these links for a new fan delay part number.
http://www.marleymep.com/
http://www.berkomeh.com/develop/prod_pdf/instructs/5200-2267-003x.pdf
http://www.grainger.com/Grainger/rp_parts_list.jsp?xi=xi&lastProdSearchCriteria=7143473&mfg=MARLEY&model=AWH-4000-C&info=&desc=Wall+Heaters&supp=20005837&save=1
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