Biasi Mf90 24s contstantly re igniting every few secs

[clarkerothwell]

Have a Biasi that for both hot water and heating ignites for approx 3 secs then cuts out and tries again, constantly does this, doesnt lock out or go to fault...
Any ideas?
Cheers

 

[Agile]

Obviously it has a fault.

But we don't give DIY repair advice for gas/combustion issues on here.

Best to get a competent engineer.

Unlikely to be too expensive, in my local area I would expect it to be under £99.

Tony

 

[clarkerothwell]

i'm actually fully qualified...Maybe i should ahve posted on the combustion chamber!!..?
Ive checked both the Thermistors, there are 10/12 ohms, removed and cleaned the venturi, tested the aps making over and can hear it switching...
Not worked on many of these, hate the things... Im suspecting the ignition board, and i know your the expert when it comes to Biasi boilers, so was hoping you'd maybe point me in the right direction...
Im going to check the ignition board for signs of dry joints tomorrow.

 

[Agile]

You need to check your measurement technique!

Ask the question in the CC where I can answer you.

Tony

 

[clarkerothwell]

Ignition board replaced, part cost £154. Charged £60 labour.
All working now.