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Ionisation problem on Heatline Solaris boiler, code F4?

We have a 2 year old Heatline bolier which has come up with the fault F4, an ionisation problem causing the bolier to completely shut down. My plumber cannot fix this and Heatline's technical support is shut at weekends. Does anyone know whether this would just be a replacement part needed?

Cleone, August 2008

home Fix label Heating label_important Home Heating Systems category Heatlinedone

Nillu is 100% right. Follow his instruction and your boiler will work again. I have just fixed mine. The fault code is wrong for me. Nothing about ionisation. I think is ignition problem.
All you need a screwdriver and a little sandpaper to clean the electrodes. Should be 10-15 mm gap between them.

Toby, April 2015

I got the same boiler and same fault! What you need to do is change the boiler nothing but problems!

Gareth, January 2013

Try cleaning the probe this usually esolves the issue

fred, December 2010

we have only had our bolier going for 3 weeks and now it has stoped working and it is bran new we got it last year but only got round to doing it and it showing code f4

nicola, October 2010

i had same problem. if u r ok with some d.i.y then try removing the probe and slightly widen the gap between the 2 prongs. this will give a bigger spark and should fix the fault

nillu, January 2009

not sure of the terminology "ionisation", is the boiler failing to stay alight, i.e lighting for 10 secs or less then locking out? If so could be a loose connex inside to the electrodes near the burner, or mis placed loose electrode. You are in "corgi" territory I think!

hobhead, August 2008

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