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I have a icos he15 condensing boiler on a indirect vented system, the system has been in for 8 months and has drayton programmer set up for the DHW the heating, the trouble im having is that the airing cupboard is in our bedroom and even when boiler is not programmed to heat the circulating pump...

The system seems to be air locking in the DHW supply not the flow and return, and the header/ cistern isn't running dry either. Cheers Lee.

Hope someone might be able to help, i recently replaced a fortic primatic in my wifes grandparents cottage, the new fortic was about 100mm smaller due to the price, the primary is feed from a wood burning arga via 28mm flow and return with no temp control, the fortic is only for DHW aswell...