by DONFRAMAC »
Sun Dec 02, 2007 10:03 pm
It sounds as if this rad. is the "ONE" rad. in the house which is supposed to take almost full flow, to protect the pump. You need to restore flow, by removing the plastic cap, by removing the securing screw. Then use a cap borrowed from another, IRV, or a spanner, to open the valves. If the rad. is too hot, just close-off the input side enough to achieve a reasonable temperature. Replace the tamper-proof caps, and tell your guests to stop meddling.
The system may need the rads. bled of gas. To do this, the boiler has to be off. Bleed each rad. of gas, then restore system pressure to 1.2 bar, using the filling-loop, so that it will run at about 1.5 bar. My combi won't run below 0.5 bar, and needs reset after a fault condition eg low pressure or high pressure relief (>3bar ).
Balancing the rads. using their IRV's, may help restore normal radiator temperatures.