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My central heating mixing valve is down... There is a clearly burned component, right next to the blue thing (capacitor). Can someone tell me what that is?

Thank youenter image description here

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  • \$\begingroup\$ Can we get a close-up? \$\endgroup\$ Commented Nov 2, 2014 at 17:41
  • \$\begingroup\$ No, nobody can. First, there are three blue things, two of them might be capacitors, but the third is most likely a varistor. However, in any case, there is nothing "clearly burned" anywhere. This mess of a question needs to be closed. \$\endgroup\$ Commented Nov 2, 2014 at 17:53
  • \$\begingroup\$ I tryed to, but I only have my phone as camera and could't really get a better picture. Is the one above those two white things, and to the right of the blue ones... \$\endgroup\$ Commented Nov 2, 2014 at 17:57
  • \$\begingroup\$ Presumably VR1 is not a capacitor, and C1,C9 are. Look at the Mini-MELF package above the upper optoisolator (right of C9). There is evidence of magic smoke on the PCB under it. No way to know what that part is, unfortunately, or what else on the board is damaged. It's dead, jim... \$\endgroup\$
    – user16324
    Commented Nov 2, 2014 at 18:38
  • \$\begingroup\$ Thank you Brian, that component is the one I actually ment. I took better pictures, fileconvoy.com/… Do you think I can just replace that component? \$\endgroup\$ Commented Nov 2, 2014 at 19:02

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Can someone tell me what that is?

enter image description here

It looks like a SMD cylindrical resistor (MELF packaging)

enter image description here

The colour code might be incomplete but it might enable you to work out the value.

enter image description here

Do you think I can just replace that component?

You can try but there is usually a reason why components fail like that and the cause of that failure often affects other components too.

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  • \$\begingroup\$ Thank you, you answered my question. I actually replaced the resistor whit another one slightly bigger in value. Is now working. \$\endgroup\$ Commented Nov 2, 2014 at 20:16

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