Where is the thermo fuse?

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Space Heater

Repair guides and support for small electric personal space heaters.

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Mónica Sánchez @monicasanc74112

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投稿日: 2025年2月10日

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Where is the thermo fuse?

Hi,

I have used for years the fellowes footrest heater. The other day, it overheated and the inline fuse "burnt". It must be a one-time fuse because even after cooling down, it doesn't release warm air, but it does "heatless" air.

Here is the picture

-edited -

I checked the heater element. I do not see anything burnt.

One of the thermal fusers looks a little bit dark. Here are some pictures:

I do not have any DMM. Is it needed to continue with the repair?

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jayeff @jayeff

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投稿日: 2025年2月10日

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Hi @monicasanc74112

If there's a thermal fuse I don't think that it will be on the board.

It will be in the fan case somewhere, where it can monitor the heat more effectively.

Perhaps near the heater element, that's where I'd look

Have you checked that it's not a case of the element burning out? No element - no heat.

With the power disconnected from the fan, use a DMM's (digital multimeter) Ohmmeter function to test the element for continuity and not that it is open circuit.

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I added more pictures to my original question. Thank you!

Mónica Sánchez さんによる2025年2月12日

@monicasanc74112

You need a DMM to prove whether the thermal fuse is electrically OK or not as it may not be visually evident that it has failed

jayeff さんによる2025年2月12日

You can pick up a very cheap one for these purposes; all you really need to tell is if it's an open circuit or not. It can also be used to check the heating element to ensure it has continuity as well.

Jerry Wheeler さんによる2025年2月12日

I checked with the DMM and there are two thermal fuses, One of them is burnt and the other one seems to be fine. The heating element has continuity. The only problem is that the thermal fuse seems to be very difficult to change.

Mónica Sánchez さんによる2日前2025年3月12日

@monicasanc74112

I'm not totally sure but I think that thermal fuse wiring connections are electric welded and not soldered and obviously not screw terminal type connections.

This is most probably due to their location as given the heat that they're subjected to then most likely soldered connections wouldn't last and screw terminal type connections mightn't be in the manufacturer's business plan i.e. heater is non serviceable as far as they're concerned

You could remove the faulty thermostat by cutting it out, but connecting the replacement would be difficult to say the least, given its location and most probably the average DIY'er wouldn't have the correct gear to do this.

jayeff さんによる昨日2025年3月12日

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@monicasanc74112

You need a DMM to prove whether the thermal fuse is electrically OK or not as it may not be visually evident that it has failed — jayeff
You can pick up a very cheap one for these purposes; all you really need to tell is if it's an open circuit or not. It can also be used to check the heating element to ensure it has continuity as well. — Jerry Wheeler
I checked with the DMM and there are two thermal fuses, One of them is burnt and the other one seems to be fine. The heating element has continuity. The only problem is that the thermal fuse seems to be very difficult to change. — Mónica Sánchez
@monicasanc74112

I'm not totally sure but I think that thermal fuse wiring connections are electric welded and not soldered and obviously not screw terminal type connections.

This is most probably due to their location as given the heat that they're subjected to then most likely soldered connections wouldn't last and screw terminal type connections mightn't be in the manufacturer's business plan i.e. heater is non serviceable as far as they're concerned

You could remove the faulty thermostat by cutting it out, but connecting the replacement would be difficult to say the least, given its location and most probably the average DIY'er wouldn't have the correct gear to do this. — jayeff

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Where is the thermo fuse?

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