Radiator airlock

[ChrisinShropshire]

Condensing boiler
Microbore piping to rads.

When we are heating water (megaflow tank) and a heating demand happens, all our radiators heat up except the one in the hall near the thermostat (i.e. no trv). Whilst we know how to clear the problem, it's annoying to have to walk around turning rads off.
We have done what we can to bleed the system, but are wondering if there is anything else we can do to prevent it happening. It stops us running water and heating at the same time as, effectively, the thermostat is no longer controlling the boiler.

Thanks in advance

Chris

 

[terryplumb]

Does the same thing happen when only central heating is selected,no demand for the cylinder water to be heated ? If it doesn't ,the flow through the coil needs throttling down

 

[ChrisinShropshire]

Thanks, it only happens when there is demand for both. I will look at the circuits to see if I can do it.

 

[Harry Bloomfield]

Thanks, it only happens when there is demand for both. I will look at the circuits to see if I can do it.

You might also try balancing the radiators..