Viessmann Vitotronics 100 Fuse
I have a KW10B Vitotronic 100 control and there is a PCB Fuse on the board that blows out every so often. When it was installed brand new 3 years ago, it came with 5 spare fuses. This fuse is listed as a transformer fuse and with out it, the boiler seems to short cycle, going on and off and not adequately heating the home. My problem is the install company doesn't seem to know where to get replacements, Viessmann hasn't answered any Inquiries and there seems to be many models of that particular fuse available. The fuse is made by littel fuse and is labeled as 100mA/250v. T 374. When I look that up there seems to be like 20 different models of the T374 and what I'm worried about is getting the wrong time delay and it either biring too quickly or not fast enough allowing stray voltage spikes to reach and cause damage to the PCB. Viessmann sales finally answered me but they are not technical and provided a part # of 7837269. When I look it up on boston supply and others they show a glass fuse which is not what is bad. Anyone else have this problem with this PCB Fuse and know where to buy them?
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094 is correct. One of the manuals said it was 7837269. however when going to websites they show glass fuses. Here is what the fuse looks like and for scale its on a salt shaker.. I googled the littel fuse and there is like 97 types of the 374 fuse.
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I'll take a look there too.didnt think about them.
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https://m.littelfuse.com/search-results.aspx#q=374&first=20&t=PartsTab
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Good news is I just came across a description of how the model # for the littel fuse is identified. 0374 is the model series, the next 4 is the Amp code in my case 100mAwould be 0100 abd the last 4 are packaging quantities. This in mind it seems I can narrow the list down from 97 to 5
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