N
newcastle phill
Im saying id meg the element before fitting.
Whose on about shower or boiler circuits
Whose on about shower or boiler circuits
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Discuss Immersion heaters 3 blown in two days! in the Plumbing Jobs | The Job-board area at PlumbersForums.net
My two bobs worth, in my experience the main cause of immersions blowing is localised overheating. In hard water areas this is normally due to the build-up of scale, not directly on the elements themselves, although this can happen, it tends to break off the surface and falls to builds up in piles under the elements obstructing the conversion currents which carry away the heat & stop it from overheating.
I use to see these pyramids of scale left in tack by the last engineer as I replaced the element shortly after the new one had been replaced. Use a scrapper to move it way or clear it out before installing new ones.
I though it was a good candidate for the cause of failure in this case until you said that the "top one" had gone as well, if the unit has a higher level "boost" immersion & this has failed as well then that blows my theory out of the water, excuses the pun!
Does the system have a secondary return installed with the mixed system pipework ??
Seems unlikely to be over voltage, when you think you test them at 500+, now measuring the resistance of the new ones may provide useful information.
Try that one again in the morning Chalked.!!I beg they never switch off on secondary !
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