I need to replace the inductor on the picture, but the color code is pretty weird: yellow, violet, green, silver (47 * ?? μH +/-10%). According to inductor color codes https://cdn.instructables.com/FRQ/J6VA/H4VQNQFK/FRQJ6VAH4VQNQFK.LARGE.gif , the third position should contain only black, brown, red, orange, yellow.
Can you please help me what this coloring could mean?
Edit: it is a control unit of a garden whirlpool (mspa oasis b-120 sapphire lite)
Just by looking at it's physical size, it is probably 4.7 µH. If that is true, then the base unit would be pH. I guess that's what the manufacturer picked for this inductor series.
However, before you replace the inductor, re-solder the top joint. That's clearly a bad solder joint, at least on this side of the board. It may have been marginal all along, then finally went open. If so, you don't need a new inductor.
If the colour bands were interpreted as per the standard IEC 60062 markings which many manufacturers use (though not actually strictly applicable to inductors as it turns out), it would be a 4.7H inductor 10% tolerance:
Yellow = 4
Violet = 7
Green = x100000
Silver = 10%
(in uH)
However, as noted that seems ridiculously large for the size (then again you don't give any reference of scale in your photo).
To throw a curve ball, that may not be a yellow marking at all, but rather a Gold band, in which case it may not in fact be 47...H at all, but rather:
Gold = 0.
Violet = 7
Green = 5
Silver = 10%
(in uH)
Which equates to 0.75uH. (Reference: Vishay Inductor Color Chart, VMN-MS6576). That would be much more reasonable for the size.
Short of purely guessing that the manufacturer used some non-standard basis such as pH as the other answer does and guessing at the value, I would simply remove it and measure as @Felthry suggests.
