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Old 10-02-2016, 15:39   #1
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Seaward Princess range unknown part

Anybody have any suggestions as to what this little guy is. He sat in the main power supply to the oven thermostat on my Princess galley range and whatever he used to do he was now impeding the flow of electrons in either direction. My money is on him being some kind of resistor but why? For the time being the range is back in service with a jumper where this guy use to live but it seems that Seaward may have had a reason for including him in the design.

All constructive suggestions gratefully received. OTOH if your advice tends to the realm of "OMG you've modified your electrical system so your boat will likely burn to the waterline tonight" this may be the wrong thread for you.

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Old 10-02-2016, 17:47   #2
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Re: Seaward Princess range unknown part

Is there any writing or diagram anywhere on it?

Why not a picture of the whole thing?

It most resembles a diode.

Is the power supply a battery?
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Old 10-02-2016, 17:50   #3
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Re: Seaward Princess range unknown part

That is "the whole thing". It's crimped to the end of a wire. And I agree it looks like a diode but the application is 110 VAC so a diode seems unlikely.

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Old 10-02-2016, 18:38   #4
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Re: Seaward Princess range unknown part

Why not ask Seaward? They're no longer in business as I understand it, but Sure Marine in Seattle was able to supply parts for my out of production Seaward Hillerange - ask for Graham or Todd, "stove techs" ... 206-784-9903. Not sure if they support Princess or not, but if not, maybe they could point you in the right direction. I'm sure you could e-mail them the photo & they could identify it for you. Just our experience...
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Old 10-02-2016, 18:46   #5
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Re: Seaward Princess range unknown part

I'm only guessing, but I suspect it's the part that breaks the circuit when it overheats if you leave the top with the oven on.

Check out "F" in this schematic:
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Old 10-02-2016, 19:17   #6
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Re: Seaward Princess range unknown part

There's no interlock switch on mine but that makes sense if it is some kind of bimetallic temperature switch. The wires on it feel loose so it could be that it has failed open.

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Old 11-02-2016, 05:28   #7
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Re: Seaward Princess range unknown part

Quote:
Originally Posted by sv Winterlude View Post
Why not ask Seaward? They're no longer in business as I understand it, but Sure Marine in Seattle was able to supply parts for my out of production Seaward Hillerange - ask for Graham or Todd, "stove techs" ... 206-784-9903. Not sure if they support Princess or not, but if not, maybe they could point you in the right direction. I'm sure you could e-mail them the photo & they could identify it for you. Just our experience...

It looks like Whale Marine acquired Seaward; they are at least selling some of the cooktops, they have the softcopy manuals on-line, etc.

Whale Marine - Products

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Old 11-02-2016, 05:50   #8
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Re: Seaward Princess range unknown part

It's a thermal fuse - or at least it's in the same package I've usually seen them.

Usually find temperature & current rating marked on the casing.
Find them on curling tongs and all kinds of things.

Cheap on ebay, easy to replace for anyone who can solder.

edit: been too long, can't be sure I actually did solder them. Crimp or flash-welded connection would certainly be best - or keep leads away from heat source.
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Old 11-02-2016, 07:50   #9
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Re: Seaward Princess range unknown part

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Originally Posted by unclemack View Post
It's a thermal fuse - or at least it's in the same package I've usually seen them.
Thank you to all who responded. I'm going to call this the "A" answer. Got some ordered.

Mainly I wanted to understand what purpose the little bit I was leaving out was intended to serve.

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Old 11-02-2016, 09:38   #10
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Re: Seaward Princess range unknown part

These are a "safety device" designed to fail and therefor have to buy a new appliance. IMHO Many even most coffee makers that stopped working was because of these non-replaceable fuse devices. I would do the same thing just bridge across and never had a problem. They aren't diodes though have the appearance of one.
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Old 11-02-2016, 10:43   #11
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Re: Seaward Princess range unknown part

These are indeed thermal overload shut down switches. Some reset themselves some are one shot. I have replaced these in a variety of electric appliances including boat heaters, coffee makers, stoves, hair dryers etc. I get mine from Digi-Key electronics. They are available through electronic stores. There should be a number on it which is the trip point temp. On boat heaters it is 150 deg. C.
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Old 11-02-2016, 11:30   #12
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Re: Seaward Princess range unknown part

Quote:
Originally Posted by unclemack View Post
It's a thermal fuse - or at least it's in the same package I've usually seen them.

Usually find temperature & current rating marked on the casing.
Find them on curling tongs and all kinds of things.

Cheap on ebay, easy to replace for anyone who can solder.

edit: been too long, can't be sure I actually did solder them. Crimp or flash-welded connection would certainly be best - or keep leads away from heat source.
Right you are it is a thermo fuse if too much current goes through it, it will open the circuit, some are auto reset but most are not and must be replaced with one of the same current rating.
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Old 11-02-2016, 12:23   #13
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Re: Seaward Princess range unknown part

It is called a Thermal Fuse, they are readily available from Mouser Electronics for a reasonable price. I hop the writing on it is intact, so you can order the correct value.
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Old 11-02-2016, 13:29   #14
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Re: Seaward Princess range unknown part

No markings of any kind remain. I guess 35 years of life onboard will do that. I ordered a 5 pack rated at 200 C from Taiwan this morning - 99 cents shipping included. I'm not sure I'll bother installing one when they arrive but for 99 cents I'll have the option.

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Old 11-02-2016, 18:15   #15
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Re: Seaward Princess range unknown part

I like $.99 choices. I would install it.
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