Biasi m96 c2

[southcoastboile]

Went out to this one.

Found heating running on all the time if off on programmer and room stat.

disconnected external controls and unplugged integral time clock. Still running on heating.

checked NTC resistance, found okay.

pressumed pcb was faulty, replaced, still the same.

anyone got any ideas?

 

[giarc00007]

will it switch over for hw, could be diverter stuck in ch

 

[southcoastboile]

It switches over for hot water okay.

b4 I ordered pcb I asked Biasi tech if the motorised head can cause it but apparently it can't.

i removed it and checked for a leak from the diverter below it in any case but looked okay.

 

[jonnyswamp]

Have these got a diaphragm operated CH microswitch like an older Baxi?

 

[southcoastboile]

Ahh yeah I didn't even think of that I'm pretty sure they do!

mabey the micro switch is causing the fault.

thanks for that I'll check it when I go back.

 

[buckley plumb]

what diverter has it got the plastic one or brass

 

[southcoastboile]

Plastic motorised head and brass body.

when I went there it wasn't bypassing just constantly running. My mate went back today and replaced the motorised head and thermistors (even though resistance was okay I didn't want a call back) he said the diverter is bypassing but doesn't seem to be constantly running now.
im getting him to go back with the body tomorrow as I don't ever replace the innards.