Hi, I'm having a problem with some of my rads not heating up.
I have a conventional vented heating system with 11 rads all on 8mm microbore, and a standard boiler. All rads are fed by separate flow and return from a manifold in the airing cupboard.
Both some of the upstairs and downstairs rads are not heating up, only 5 of the 11 are hot, the others mainly don't even have heat at the flow pipe. I have bled them all
Its Pumped by a Grundfos super 4 that seems to be running ok, had the motor off but couldn't extract the impeller to check it. Today i have drained down and flushed out 2 rads that were not working, also back flushed the flow and return pipes for these too upto the expansion tank so guess the pipes are not blocked. Thoroghly cleaned the gunk from the expansion tank and re-filled and bled rads. When refilled one of them gets hot and one completely not.
Even shutting down all the hot rad doesn't sem to get the cold ones going.
Any ideas, I'm trying to stick to the warm rooms at the mo.
I have a conventional vented heating system with 11 rads all on 8mm microbore, and a standard boiler. All rads are fed by separate flow and return from a manifold in the airing cupboard.
Both some of the upstairs and downstairs rads are not heating up, only 5 of the 11 are hot, the others mainly don't even have heat at the flow pipe. I have bled them all
Its Pumped by a Grundfos super 4 that seems to be running ok, had the motor off but couldn't extract the impeller to check it. Today i have drained down and flushed out 2 rads that were not working, also back flushed the flow and return pipes for these too upto the expansion tank so guess the pipes are not blocked. Thoroghly cleaned the gunk from the expansion tank and re-filled and bled rads. When refilled one of them gets hot and one completely not.
Even shutting down all the hot rad doesn't sem to get the cold ones going.
Any ideas, I'm trying to stick to the warm rooms at the mo.
