Ferroli optima 901 ch not hot, hw great

18 Mar 2013
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United Kingdom
Just bought a house and when moved in I have a problem with the central heating.
The boiler is as per above. Optima 901.

The how water works great and fires up v hot in no time.
The central heating fires up ok but the gas flames appear to be too low. Ie, they are not as powerful as when the HW is put on.

All appropriate knobs are in the correct positions. Wonder whether anyone has come up against this problem before and if so, what was the diagnosis?

Just for clarity, the ch does not get warm at all. Perhaps the radiators warm to luke warm, but no more than that. The output pipe from the boiler for re ch is warm but not too warm that I cannot touch it. Think problem is associated with the electrics not telling the boiler to send 100% gas when the ch is activated.

Thanks in advance for your comments.
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