Effects of boiler pressure dropping too low

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Hello experts:

About a week before Easter, our Vailant (EcoTec Plus 824) boiler stopped working. On investigating, I found that the water pressure had dropped below working level, and there was a leak. An engineer came and said that the fault was the diverter valve and that he would obtain one and fit it. Then came the Easter holiday, and, even after it ended, I had to wait longer, until the part was obtained. The upshot — and to get to the point — was that the boiler needed to be topped up every so often, to keep on working. In all (because the severity of the leak varied from day to day — sometimes it went three days before needing a top up, and sometimes only a day or so), I must have topped it up (and let it fail, through leakage) about five times in the fourteen or so days of malfunctioning.

The boiler seems to be OK now, having been repaired. However, in the manual, I notice a reference to "damage to the boiler because of allowing the pressure to drop too low" — or words to that effect. If I had known this, I would have looked at the pressure more often, but I did not know it.

My question is, then, ought I to be concerned about what happened? Is there likely to be any damage, and if there is, how would it show?

With thanks in advance, to anyone that can give an informed reply,
L.L.
 
If it’s only a few weeks, shouldn’t be that much of a problem. Did the engineer add inhibitor back into the system? If not, I recommend getting this done. If you’re confident, you can do this yourself.
 
If it’s only a few weeks, shouldn’t be that much of a problem. Did the engineer add inhibitor back into the system? If not, I recommend getting this done. If you’re confident, you can do this yourself.
Thanks Chris. Actually, as I said, it was only a fortnight, so I presume that the lack of inhibitor would not be a serious problem for such a relatively short time. And the engineer did put a litre of inhibitor in, so it will be OK now. However, my question was about damage to the boiler as a result of allowing the pressure to get too low, not really because of any dilution of the inhibitor. What possible damage might result from allowing it to get low in pressure? And how would this show, if it had occurred?
 
as a result of allowing the pressure to get too low, not really because of any dilution of the inhibitor. What possible damage might result from allowing it to get low in pressure? And how would this show, if it had occurred?
Usually overheating, however, this boiler will have a low water pressure sensor, so it’ll go to F22 before that happens.
 

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