Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 32 replies
  • Subscribers 32 subscribers
  • Views 3475 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Likely Gas Combi-Boiler P.C.B. Damage.

Zoomup
Mornin' all,

                         I hope that you are all keeping your spirits up during these trying times.


Yesterday I made a mistake. I can only attribute the reason to the work environment and me being pre-occupied with self distancing on site and being distracted by the house occupants, plus stupidity.


The owner had apparently struck a wall thermostat due to it being unreliable in operation, and he having a bad temper. The dial part was cracked. He asked me to change it for a new one. The wall thermostat is a Honeywell make. I have wired up many of these in my time. I did not have a Honeywell replacement but did have another make of a similar design. So I fitted that. After I had fitted the new one I noticed that I had no mains supply showing at the wall stat. I checked the switched fused connection unit at the boiler and it was displaying a glowing neon, so the 3 Amp fuse there was intact. I was asked to refit the original wall stat, which I did, and a gas engineer is coming out to look at the boiler. I did not see the boiler working initially, but the owner and his wife assured me that it was working that morning.


I must have wired the new wall stat up wrongly and shorted between L and N. That probably blew the 1, 2 or 3.15 Amp fuse on the boiler P.C.B. I did not dismantle the boiler to look.


What is the chance of irreparable damage to the boiler P.C.B?


Unfortunately I did not note the make and model of the boiler.


Bye,


Gloomy Z.

  • 0

    Zoomup:




    Chris Pearson:




    Zoomup:

    If the neutral at the wall 'stat had had blue sleeving or blue P.C. tape applied (and I had been more careful as well) this problem would not have happened. I believe that I naturally assumed that the black of the new colours 3 core and E cable was N. rather than the grey. A mistake never to be repeated. There is no fool like an old fool.




    So if a L-N short might have damaged something, you were working live? ?



    Not working live Chris. Supply off for working, on for testing.



    Just wonderin'. ?


    You see, when somebody talks about shorting a couple of conductors, I think of them being in contact with each other, or in the same terminal or junction. Not that N and SL have been transposed. And yes, I agree entirely, N should have been properly identified.

  • 0
    It is most likely that all that has happened is that the fuse has gone, if you are most unlucky a relay contact may have welded as the timer closed power onto a dead short.

    Hopefully the gas man is not a 'change the whole module without thinking' type and actually has a pack of fuses on him.



Community Rules & Guidelines