I have an Ariston Clas He system with an error code of 108?

Refilled pressure but still Locked in error code and won’t fire up

Jay W
March 2023

Guys if your having to top your pressure up it’s not a good thing too keep topping pressure as you will keep putting oxygenated water in your system which will cause rads to rust internal and cause iron oxide which will destroy your pump and Diverter valve And general blockages

Losing pressure could be

1 leak on system
2 expansion vessel needs pressurising
3 prv leaking caused by over pressurising

Boiler clinic
December 2018

Thank you, I turned both black taps either side of the silver braided pipe and the pressure went up. I increased the pressure to 1 bar turned both taps to their original positions and tried the hot tap. It works and I now have hot water.
Thanks again

Steve
January 2017

I opened the black taps underneath that lead to the silver corded pip[es. Then there are tiny grey ones as well which I had to open. The pressure guage shoots up really fast then so be quick to turn the black ones back to off. Then the grey ones. This raised the pressure guage , I made sure this only went to slightly over the 1, which is why you need to turn them off quick. My boiler then started working almost immediately. Hope this helps!

THank Helen

Feras

Feras
November 2016

Silly question, but there are two small 'taps' either end, left and right hand sides. My husband usually turns the one on the left to reset the pressure, but can't remember how the tap on the right should be set - open or not. He was distracted so doesn't want to cause any further problems.

Beverley
November 2016

Good morning
I don't have code 108 or any code ! But my boiler some times works and sometimes not ,brisith gas been out 16 time's can't find a problem, of course as boiler works each time .
It seems to fire up and comes on for couple second's then off , no hot water or heating. British gas think it me !
It's so intermittent it's unreal . Help please

Margaret
March 2016

The yellow tap you don't need to turn , as it's the gas . There will be a braided hose under neath with two aller grey or black knobs , you need to turn them both , so they are facing the same way , fill it to 1 to 1.5 bar when cold , then turn back off . I install this for a living , brill boiler

Claire Bradley
March 2016

i got up this morning to the same problem ,lucky for me my plumber left a bleed pipe on mine so only have to open 2 small black levers then the pressure creeps up to around 1.5 bar ,good luck to the rest of you

justin jones
September 2015

I have same problem but can't see any answer to any questions... My pressure gage won't go up.. Please help

Andrea
July 2015

I just spent 2 hours searching the web, trying to contact my installers, trying to find a solution, and you just provided the answer which was simple all along, I am very impressed, thank you!

Pat
June 2015

tried this but pressue guage is not mo ving and boiler wont come on any suggestions please

ken
April 2015

I a new model , i do not have a black valve mine is blue turn and you won't freeze to death

Nicolau Alex
July 2014

thank you!!! its all working now :)

luba
May 2014

i have this problem but when i turn the black ones and yellow then grey one nothing happens the gauge doesnt move and if i do grey tap before black it releases some water from the grey tap,

eoin
March 2014

So where are the instructions?? you people say thx for the instructions but i don't see any

Vasile V
February 2014

Walk up this morning same problem and the solution works - Thank you!

Dominic
January 2014

Thank you people, turned the black tap to increase pressure to 1. Brilliant

Tamsin
September 2013

Thanks guys opened the grey first then the yellow then the black, pressure gauge shot back up turned them all off working fine again.

Antony
March 2013

Great advice. Thanks Helen.

I had error 104 on my Ariston Clas HE and I turned the yellow and two black levers/taps under my boiler and it started again - hooray!

Jenny
February 2013

i have more than 1 and half not 2, it's a big problem or not? please answer to my question. :)

Levan Jirkvelishvili
January 2013

hi..we have the same problem.i do all of your instraction but i cant turn on my boiler...
i have that error yet...

atefe
November 2012

good info, woke up to the same 108 fault, read this and topped up the system and its now working fine. thanks

thomas wilson
November 2012

i turned the black and grey pipes and the pressure gauge went up to 1 and a half...now i have heating...thank you sooooooooo much...but still getting plumber round in morning to check all ok.

maria M
January 2012

hi.. can i just say a big thank you.. ive woken up this morning to a freezin cold house and error 108 on my boiler.. followed your instructions and hey presto i have heat again.. i did think the pressure guage was a bit low but didnt think they just lost pressure for no reason !! thank you

julie parkes
January 2012

omg you are brilliant thank you we were frozen and no water ,i only opened 1 grey tap and the pressure went up not sure if i should have opened both taps or not but we have heat thank god

jacqueline maitland
November 2011

ii follow a he said and works for me too, thanks, but i just open the tiny grey pip and The pressure guage shoots up really fast.

Luciano V
January 2011

Hi Geraldine, I have had this same problem and after looking on loads of websites realised that the pressure guage had also reduced. I opened the black taps underneath that lead to the silver corded pip[es. Then there are tiny grey ones as well which I had to open. The pressure guage shoots up really fast then so be quick to turn the black ones back to off. Then the grey ones. This raised the pressure guage , I made sure this only went to slightly over the 1, which is why you need to turn them off quick. My boiler then started working almost immediately. Hope this helps!

Helen A
June 2010