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Wot is wrong with my Ferroli Optimax HE 31 C gas boiler?

My gas boiler is flashing F37, which is low system pressure. The manual says that I should fill the system to 1-1.5 bar. But the boiler wont let me!! Does anyone know wot could be wrong?

Thanks

Lisa
August 2010

Ferroli Heating, Home Heating Systems He 31 C Gas Boiler

Pilot is not showing flame got no hot water or heating

mike
December 2014

Hi guys - so glad to have found this!

I tried doing the above and the gauge didn't even flinch and I was concerned to leave it open for so long. I bled a radiator last night (which had a lot of air in it) and therefore the pressure has gone.

How long do you usually have to keep the valve open for? Are we talking seconds or minutes?

Thanks guys

Mike Useless with Boilers Price
October 2010

Get in touch with Ferroli, the filling valve will be seized. They will change the valve under warranty, no fuss and no charge.

Gaz BFC
September 2010

If one of the black taps is seized this is your problem. It must be seized closed and this is preventing the water from flowing. Unfortunately this means either applying more force to the tap and risking damaging it or replacing the tap. It will probably move with a little encouragement but the plastic knobs on the taps usually turn and leave the valve in the same place.

Andy
August 2010

Thanx Andy, but the one of the black knobs wont turn. There is a blue one though, but nothing happens when I turn the black and the blue.

Lisa
August 2010

You have to open both the black taps to allow mains water to flow into the system but open the second one slowly as this will allow the water to flow. Watch the gauge to make sure you don't over pressurise it. I have to do mine about every 6 months

Andy
August 2010