Resistor identification help.

Thread Starter

brumster

Joined Oct 25, 2017
10
Morning all, I'm after a little help and struggling to figure this out. I have what looks like a blown resistor on a PCB.

It's a 5 band and looks to be Brown, Black, Brown, Gold and then Black. The tolerance is confusing me (sorry, not my field of expertise). It's from a PCB in a boiler switch. I have another one which is working and the resistor in that gives a reading of 101 ohms on the meter.

Image provided.

Can alone help me identify it so I can source a replacement?

Thanks in advance for any help you might provide.

Paul
 

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Thread Starter

brumster

Joined Oct 25, 2017
10
Yes it should be 100 ohms 5%..
Another question, would you mind explaining why this is 100ohms and not 10? If I put the Br,Bl,Br,Go through a four band resistor calculator it correctly comes out at 100 ohms, what does the last 5th black band mean? Thanks. P
 

Delta prime

Joined Nov 15, 2019
159
The most important question is yet to be asked,why did it blow?
When the resistor is replaced and circuit is function properly count your blessings. If not that's when the fun begins.
 

Thread Starter

brumster

Joined Oct 25, 2017
10
Photo taken under a magnification lens using an iPhone XS :)

It's a boiler switch and it looks like the earth screw inside the casing has worked it's way loose, that in turn has caused a short, from there my limited knowledge has identified that the component in question (the resistor shown above) has blown, a meter across the pins shows 0. Remember that the image above is from a working identical switch, the resistor in question has visible signs of damage.

Hopefully a replacement resistor will bring it back to life, if not then you're right, the fun begins or I source another. But, can I be that lucky!

Thanks for all the replies, great community!
 

Ylli

Joined Nov 13, 2015
891
Now sure how it was determined that the part in question was a 3W, but assuming it was, and the 5W art you ordered will fit, then it is a fine replacement.
 

Thread Starter

brumster

Joined Oct 25, 2017
10
Me neither, if size has anything to do with it then it possibly was a 3W as the 5W replacement is slightly larger than the original component.

Everyone likes an update (I do anyway) so here's how I got on......

The unit in question is a Hive Heating SLR Receiver (the boiler switch).Model is Hive SLR1 Receiver.

I ordered the replacement part yesterday from RS and it arrived today. The first image below shows the failed component. The second image showing the fitted replacement, as you can see slightly larger in size. I powered the unit up (using a dim bulb tester) and it powered up immediately. It has now been fully reset, tested and re-added to the home heating system.

To all those above that took the time to help me out a very large thank you! Really appreciated!
 

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