Biasi Riva 24 no attempt to fire up

[dazwalsh]

I have a Biasi Riva 24 combi that appears to be functioning correctly, that is no lights to indicate fault. The problem is the boiler makes no attempt to fire up when turning on CH or when asked for DHW.

when i turn on the hot tap i hear a click but nothing else, the lights to indicate DHW operation come on but there is no pump, fan etc to accompany it.

Same with CH, it just sits there with its lights flashing as normal.
i first assumed a problem with the PCB but that itself seems to operate completely normal, so whats next in the sequence of start up? Pump? Fan?

its a rental so I'm going to take a look at it tomorrow morning again but would like to know what happens in what order when the boiler is called for. That way by order of elimination i can get it fixed.

Any help would be appreciated.

Many thanks in advance

Darren

 

[Dotty]

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