I fitted repo cast iron rads two years ago and from that day onwards there has always been a serious air bubbling issue around the pump to the extent that there's so much air, it takes ages for the rads to warm up. It's not air in the system due to lack of bleeding because if I run the pump without the boiler, I get no bubbling sounds at all. It's only when the water is heated this happens.
I confess, I made the mistake of not adding inhibitor at the time. But I have flushed and flushed, used DS40 and flushed again, but I still can't seem to get rid of the bubbling.
I removed the heat exchanger today and heated it on my stove. I saw bubbling within 30 seconds of applying heat. What on earth could be causing this? After I flushed it with water for a while, I applied heat again and all was fine.
So my questions are:
1. What is causing this bubbling as soon as the heat exchanger is heated?
2. How can I fix the problem (since flushing for the last two years hasn't worked).
Thanks!
Alan
I confess, I made the mistake of not adding inhibitor at the time. But I have flushed and flushed, used DS40 and flushed again, but I still can't seem to get rid of the bubbling.
I removed the heat exchanger today and heated it on my stove. I saw bubbling within 30 seconds of applying heat. What on earth could be causing this? After I flushed it with water for a while, I applied heat again and all was fine.
So my questions are:
1. What is causing this bubbling as soon as the heat exchanger is heated?
2. How can I fix the problem (since flushing for the last two years hasn't worked).
Thanks!
Alan