The dreaded F.9... a question regarding flushing

Rob Foster · Aug 28, 2018

ShaunCorbs said:
??

I though the pics were he op's system and magnaclean - I didnt read the post properly durrrrrrrr

king of pipes · Aug 28, 2018

Get with the program bud filters are a Worcester (made by adey though they won't admit it ) and a fernox tf1 leak master amazing how much crap they can trap . Cheers kop

Rob Foster said:
I though the pics were he op's system and magnaclean - I didnt read the post properly durrrrrrrr

Steve2381 · Sep 1, 2018

Just to keep all updated.... still no fix. I ordered a new pressure sensor, as S97 flashes when you ask it to display its current activity, and that can either be a dud/blocked pump or the pressure sensor.
Pump def OK, and sensor only £23.
I assume I isolate the boiler using the valves underneath it and swap it out.
We had the water pressure checked here by the water board... they said it was above average pressure. Nothing stupid like the pressure coming in is too high? I highly doubt it.

king of pipes · Sep 1, 2018

Drain the boiler after isolation bud protect any electrical parts plenty of blue roll to hand, as has been said before get it cleaned properly first and protected or you will end up back in the same position. Kop

Harvest Fields · Sep 1, 2018

king of pipes said:
Drain the boiler after isolation bud protect any electrical parts plenty of blue roll to hand, as has been said before get it cleaned properly first and protected or you will end up back in the same position. Kop

I got called to a Vaillant the other week where the sensor had blocked. He had the sensor replaced a few weeks before and it was blocked solid again. I am going to flush the system for them in a few weeks. The water way on the sensor is so small on these sensors that it doesn’t take much before they get blocked.

Rob Foster · Sep 2, 2018

Harvest Fields said:
I got called to a Vaillant the other week where the sensor had blocked. He had the sensor replaced a few weeks before and it was blocked solid again. I am going to flush the system for them in a few weeks. The water way on the sensor is so small on these sensors that it doesn’t take much before they get blocked.

Its always been in my mind to insert a plate heat exchanger right next to the boiler and let it do a tight circuit and let the mucky stuff go around the heating system. The problem has been a heat exchanger which has decent sized pathways thro it and of course two pumps but there is one cause I found it - but its on a computer thats gone lala and is for service - is this a good idea ?