biasi m96.28sm/c2 not firing up for Central Heating.

[lisajo79]

Hi I have spent hour's sesrching for vlues but no luck pls can anyone help.
We have the above boiler with wireless iflow digistat. Hot water is fine but when the thermostat calls for hesting the boiler just doesnt fire up. we are grtting no error lights on boiler and the wireless control seems to be communicating to the digistat box wired to the boiler. ??

 

[Slugbabydotcom]

Assuming you have some degree of electrical competence:-

The end product of your timer is that the switch wires are electrically joined together at the circuit board. Identify these wires and link across the switch wires and see if it fires.

If it does fire then the problem is with your wireless stat equipment. Commonly the remote unit needs new batteries or the or it needs synchronising with the base unit. Sometimes the relay in the base unit is faulty and the aforementioned electrical connection isn't made.

If the original timer is still connected to the circuit board then unplug it as it is superfluous in any case

 

[lisajo79]

I have no knowledge at all myself but a friend has been looking at it and tried new batteries in the wireless thermostate, tried wiring it straight in but still no fire up.

 

[Agile]

Have you linked the two boiler call for heat wires?

Are you sure the boiler controls are correctly set?

And particularly the boiler's time clock is showing "on" in its display?

Tony

 

[Slugbabydotcom]

And particularly the boiler's time clock is showing "on" in its display?

Tony

Sometimes the boiler time clock can indicate 'ON' but the relay inside doesn't make the connection. By disconnecting its plug from the pcb the boiler goes to an 'always on' state and the 'call for heat' comes from the the aforementioned link.

 

[Agile]

That is a pretty rare situation though.

Much more common is the plug at the back of the clock to have been wrongly replaced as they are not polarised.