Thanks everyone.... found the blockage in an 'S' bend on the feed pipe, just before the immersion tank inlet. Managed to clear it with a length of wire fed in from the tank in the loft.
I'll leave the heating running (on and off) till the weekend, then drain it again and put in the Fernox. Then look at your suggestions for preventing the problem from happening again.
Thanks again.
Ribs
I'll leave the heating running (on and off) till the weekend, then drain it again and put in the Fernox. Then look at your suggestions for preventing the problem from happening again.
Thanks again.
Ribs