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Discuss Radiators won't bleed unless the system is on in the Central Heating Forum area at PlumbersForums.net

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Hello. I am sorry to open this with an admission: I made a dumb mistake and am seeking any help possible, thanks in advance ---

The pressure dropped on my boiler, so I opened the usual valve and let it climb up to 1.5 bars. I've not been in this house long, so the boiler is new to me. I closed the valve... or so I thought. I came back later to find an error, and the pressure over 3 bars and climbing. Water was dripping from the boiler pipes in more than one place.

Mildly panicked, I switched off the heating then went around the house and opened the bleed valves on all the radiators. Water came out of one of them, but not the rest. I left the valves open and watched the pressure meter drop over several hours down to 2, and no lower. I closed all the valves, and turned the heating back on. The boiler powers up, and the pressures sits between 2-2.5, but... the radiators do not get hot.

If I bleed the radiators now while the heating is off, nothing happens. No air, no water, no change.

However, if I open a valve while the heating is on, plenty of air comes out, and the radiator will get hot. I've read this is a bad idea, but it seems to be the only way to get hot water into the radiator at all. However, it will not last after I close the bleed valve up again.

If I just turn the heating on and wait several hours, after a time, it seems the boiler will give an error, F37 - which apparently means low pressure (Ferroli boiler) despite still hovering around the 2 bar mark.

Is there a way I can try to reset things again? Any advice would be appreciated. We've just moved house and are hitting a huge number of unexpected costs already, I would really like to avoid professional repairs/new boiler if I can.
 
Sounds like the gauge is faulty time to call a pro out
 
Did the system work ie. all radiators getting up to temperature evenly before this episode?
They did, but pressure was dropping regularly apparently.
Sounds like the gauge is faulty time to call a pro out
I think you’re right, I’ve booked someone.

It’s frustrating because I can get the pressure right, and if I open a bleed valve I can get the radiator hot and quite evenly too, but it won’t stay on.

Well, I appreciate the input anyways, cheers
 

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