Overall I was disappointed with the workmanship of the peeps who installed my Combi but that is another story.
It occurred to me today that after the install [and seeing that everything was okay] the system has been drained down not once but twice while I had redecoration work done [downstairs rads taken off]. While I had the downstairs rads off I flushed them clean with a hosepipe [I could NOT believe how much gloop was in them!]. Install was in August; has been refilled and working for 2 weeks now.
Now this obviously means that all the inhibitor that had been put in must all have been drained out too? So I would need to have this added. I replaced my bathroom rad with a towel rail/radiator. This has a draining screw atop one side rail and a "blanking plate" [ie looks like a big nut] on top the other end.
1) Do I need to add Inhibitor back into the system? 2) Which should I use [worth asking the installer what he used before?- that way I get to kow if they even did!]
3) Could I do it myself by pouring it into the top of the towel rad? Simple case of Opening the bleeding screw (+/- removing the blank screw also?) or is there more to it and I should leave it to a pro?It came to me because I had had the system running lots over the past couple of days and there is a quiet background hum not just downstairs but actually all through the house [via the rad pipes I presume]. I might be paranoid but I didnt think I could hear it this loudly before...