I am attempting to repair a Crown branded fan heater. The thermal fuse has blown.
What is likely to have caused the thermal fuse to blow - failure of the mechanical cut-out?
There are three cut-out outs. One is the thermostat, the second is the mechanical one just above the heater elements and the third is the thermal fuse also above the heater elements.
Thanks.
-- M.Joshi
A possibility for failure/opening of the thermal fuse is inadequate air circulation. If the heater was used sitting too close to a wall, has a partially-blocked air filter, or any other abnormal placement that would restrict the unit's accessibility to free air flow, the internal temperature can/will likely increase.
Some folks with little understanding of how heating appliances (and many other devices) work, will place objects on heaters to warm those items (wet towel, jacket, hat, etc). Any objects placed on many styles of heating appliances will substantially decrease the needed free air flow.
One could test each temperature limiting device, but it's often much easier to just replace the thermal fuse with a proper replacement device*, and make sure that the interior is clean, and that the appliance has adequate free air flow at the location where it's to be used.
*Use of an inappropriate safety device is hazardous.-- Cheers, WB .............
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