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Douglas
Douglas, HVAC Technician
Category: HVAC
Satisfied Customers: 3089
Experience:  Manufacture Rep for Major Brand, Technical Trainer, NATE
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Hello, I ordered a new thermocouple for my gvr 50 100. The

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Hello, I ordered a new thermocouple for my gvr 50 100. The factory one appears to fuse soldered to a bracket, but this is missing off the replacement thermocouple. Did I get the wrong part?
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Douglas :

Hi, I'm Douglas and I am here to help you resolve problems with your heating and cooling equipment.

Customer:

hi doug

Douglas :

It shouldn't be fused... one moment while I look at something

Customer:

The original unit has something soldered in between the thermocouple end and the connector outside of chamber. It looks like a fuse

Customer:

But the part I ordered, and AO Smith confirmed as being correct doesn't have it

Douglas :

oh, I see.... ok ... Can I ask what the part number they sent you is?

Customer:

The bag says(NNN) NNN-NNNN that doesn's seem like the right number, if I'm rembering my order correctly....

Customer:

going to check my email records.

Customer:

it is the right number, sort of. the bag is missing the last 3 numbers - 015

Customer:

Yes

Customer:

GVR 50 100

Douglas :

does it have the pezo lighter?

Customer:

Yes

Douglas :

and the thermocouple wont screw into the gas valve, the one you got?

Customer:

It will screw in just fine, I'm concerned I got the wrong part because the factory unit has this built in thermetic fuse, but the replacement part does not.

Douglas :

Oh... a fusible link

Douglas :

you're in CA.... that may explain it

Customer:

Yes

Customer:

Yet another ridiculous CA Law messing me up here?

Douglas :

Likely....

Douglas :

I cant find anything on an AO smith that requires it. Here's what it is. If the burner were to roll flames out, that link would melt and cut the pilot milivolt signal and ultimately drop the gas out.

Douglas :

I dont see that anywhere, even as an accessory

Customer:

Me neither

Douglas :

I would ignore it

Customer:

so I can remove the old one, and proceed with the install as if it didn't exist?

Douglas :

yes. I am looking in their complete parts book.

Douglas :

for all models too

Douglas :

If I were servicing it, I would install a standard thermocouple. I just dont see that in any parts or service breakdown

Douglas :

Is this the original thermocouple?

Customer:

Yes, the heater is less than 4 years old. 3 years if you minus the house was empty due to foreclosure by previous owner.

Douglas :

it just doesnt seem like an AO Smith part.... wait... let me call a buddy

Customer:

I can take a picture and send it to you if necessary.

Customer:

By the looks of the backet that hold the fuse to rest of the burner assembly, I'd say it factory. Too clean and professional to be a replacement part.

Customer:

bracket

Douglas :

Yeah, ok, I just called my buddy who works in the supply house. He says just use the thermocouple... he said they dont even stock it because none of the techs or customers want it

Douglas :

he said he had one guy adiment about it and they couldnt find it in their parts list either

Douglas :

and he's the AO smith distributor

Douglas :

but it is a thermal link

Douglas :

sometimes referred to as a fusible link

Customer:

Wow, sounds like another dumb CA law strikes again. I'll use the replacement. Thanks for your help

Douglas :

no problem. go get your water hot

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