How to: Top up the pressure on Glow-worm Flexicom Combi Boiler - Low Water Pressure Fault Code F22

Are you getting a Low Water Pressure Fault Code F22? or just looking to top up the pressure on the Glow-worm Flexicom Combi boiler?
This video shows you where and how to do that. Under the boiler, you will find 2 levers. These levers quarter turn to allow water to flow into the heating system to help increase the pressure.
If you find the pressure keeps dropping regularly then you may have underlying issues with your heating system that need looking at by a Gas Safe Registered engineer. You can find your local GSR on the Gas Safe website.
If you have any questions, feel free to leave a comment or get in touch.
Thanks for watching.
Links:
Gas Safe Website: www.gassafereg...
DPJ Plumbing, Heating and Gas: www.DPJplumbin...

[@sillwuka]

First day back from holiday and it's snowing and the heating wouldn't come on. Lifesaver, thank you so much

[@dpjplumbing]

No worries, I'm glad it helped you out. Thanks for leaving a comment!

[@alesatenkari2072]

I'm a single lady living alone in my studioflat, I needed hot water to shower before work and was so scared to have to take a cold bath in full winter/storm because the heater stopped working. You saved ny day :)

[@dpjplumbing]

Glad I helped you out! Thanks for taking the time to comment!

[@Theos1919]

Thank u dude, got me feeling like tesla out here

[@dpjplumbing]

No worries!

[@flavadmusic]

Hi, I managed to turn the valve as you said however it never climbs above 1.1, and flashes between that and 0.9bar Does this indicate a fault? I read it should be at atleast 1.6 but after 10 mins it won’t go any higher

[@dpjplumbing]

It could be that the mains water pressure isn't powerful enough to raise the pressure that high Or a common issue with this boilers is the digital pressure sensor gets clogged with debris/sludge and it stops reading the correct pressure. Without testing it myself, I can't tell you if any of these are the actual issue. But the recommended pressure from boiler manufacturers is for the pressure to be between 1bar and 1.5bar. Hope that helps.

[@stopcheat500]

Thanks for this video. How to reduce pressure, if the pressure is more. My one is showing 3 bar. Thanks

[@dpjplumbing]

The easiest places to reduce pressure is by a drain off valve or bleeding a radiator into a jug

[@emmamcbride1268]

Can’t thank you enough for this video!

[@dpjplumbing]

No worries! Thanks for leaving a comment, it's much appreciated 👍

[@TatyanaK-t1b]

Hello, thanks for this video, if I have 3,2 bar Flashing screen it’s a problem? I must have abruptly unscrewed two valves 😮

[@dpjplumbing]

I've had common issues with these boilers/filling loops passing. They slowly fill the heating system causing the pressure to rise over 3 bar. If I suspect that is the case, I undo the filling loop and if it continuously drips then that is usually the cause. Only way to stop it is to replace the filling valves but they are part of the inlet valves of the boiler.

[@darrenwoods645]

Great video mate helped me out there nicely..cheers

[@dpjplumbing]

No problem! Glad it helped you out + thanks for taking the time to leave a comment 👍

[@javadrahmannezhad9908]

Saved my life😊Cheers👏👏

[@williamrussell2768]

Excellent video

[@dpjplumbing]

Thanks!!

[@donnajones2468]

Watching your video whilst water piddles out the bottom of my boiler with nobody working between Xmas and new year and no hot water or heating. Chuffing freezing!

[@dpjplumbing]

Sorry to hear that Donna, not much I can do to help with that. Hope you get it sorted quickly!

[@donnajones2468]

@@dpjplumbing thank you. Need something to cheer it up to stop it crying 🤣.

[@dpjplumbing]

@@donnajones2468 lol!

[@sgb64]

Thanks! So helpful! You saved me!

[@dpjplumbing]

Thanks for leaving a comment, it's much appreciated. Have a merry Christmas and happy New year Dan, DPJ Plumbing Heating and Gas

[@fperkon1]

I do exactly that, and have for many years, but now I turn the left valve on and there is silence. I cant hear any water coming in. Ive checked the mains pressure at it is at 3.8 bar. The left valve does work and give water (i checked that the metal filling pipe gets pressuried. Any ideas what might be wrong?

[@dpjplumbing]

Not sure. I know on some boilers sometimes the valve will seize up and the plastic lever will just twist out of shape. I'm not sure on these type if it is the case. From memory I think they can come in plastic and metal. Try using a small screw driver to remove the plastic lever and use a spanner/grips on the brass part of the valve

[@richard3lee]

I had the same problem. Basically the right valve is not turning even though you turned the silvery knob because it’s worn and slipping off. Take off the knob(a screw under it) and get a wrench to turn it to the right. The actual valve has seized overtime and not moving even when you turned the silvery knob.

[@dpjplumbing]

Thanks for your comment 👍

[@oliverboo421]

Helped me out fella!

[@janetnicholson5001]

Thanks! Very easy to understand.

[@dpjplumbing]

Thanks for the comment, I'm happy it helped you out 👍

[@zeynep3900]

Hi, I don’t know how fast you reply to comments but I have an issue with my boiler that I was hoping you might be able to help with. So yesterday it came up with the F09 code and I tried re-setting the boiler as a first step. When I reset it, it told me the pressure was 1.1 but still would keep going back to the fault code. So I tried repressurising it like you showed in the video and it increased the pressure. However, despite only opening the valve for a couple of seconds, the pressure has now gone up to 2 and keeps fluctuating between 1.9-2.3. I turned it off and left it for the rest of the day and have just come back this morning to try it out again. Now the pressure fluctuates between 1.9-2.1… I have 2 main questions. My first question is whether a pressure of 2 is too high? I searched online and it said that a pressure of 2 could cause long-term damage to the boiler - so I’m a bit concerned. My second question is, is it normal for the pressure to fluctuate like this? I assume not 😅 so if it is not normal, what would you suggest I do? Thank you so much!

[@zeynep3900]

Just to give another update, I turned my heating up to 17 degrees Celsius (not on the boiler itself, but on my thermostat). I left it for a few minutes to heat up and then it was showing that the pressure was 2.9… this makes me think there is a problem with the heating but I am in no ways an expert so please can you advise me! That would be very much appreciated 😁

[@dpjplumbing]

Hi, It sounds like you have an issue with the boiler itself. It could be the expansion vessel or the digital pressure sensor inside the boiler. Both of those things need testing by someone qualified and knows what they're doing. Fluctuations are normal during boiler operation as the heating water heats up it expands and creates more volume and naturally the pressure will rise slightly. But the expansion vessel is designed to absorb that expansion. It's difficult to give you a straight answer without seeing/testing it myself.

[@zeynep3900]

@@dpjplumbingThank you so much for getting back so quickly! Seems like I will just have to get someone out to come check it, thanks for the advice

[@dpjplumbing]

@zeynep3900 no worries, apologies I can't be much more help!

[@Rowan126]

Thanks for this video, managed to re-pressurize my boiler with your content

[@dpjplumbing]

Thanks for the comment Rowan, I'm glad it helped you out 👍

[@standarddiamond]

Hi. I have this exact boiler but I don’t have those valves underneath. There is just one single pipe going in underneath and that seems to be the gas. Also - how do you bring the measure display up. I can only see the F22 error flashing, and if I reset it just shows the temperature until the error kicks in again. Thanks.

[@dpjplumbing]

You might have a braided hose type filling loop instead of the manufacturer's supplied one.

[@standarddiamond]

@@dpjplumbingHi thanks for the quick response. The only other pipe on the back is a flexible one that leases to a waste pipe. I think that’s for condensation or something. There’s the a white cable that’s like a power cable - as thin as a standard plug cable. The rest of the space at the back is empty. I opened the front of the boiler to see if there was anything obvious in there, but there isn’t.

[@dpjplumbing]

@standarddiamond without seeing it myself I can't offer any more advice sadly

[@standarddiamond]

@@dpjplumbingok, thanks mate. Maybe I can upload a video tomorrow and share the link. Thanks for your help so far.

[@standarddiamond]

@@dpjplumbingHi again. Here’s a link to a quick video of the area at the back a bottom of our boiler. kzbin.info/www/bejne/jILXZ56FrdCiY5ofeature=shared thanks.

[@PatriaJorda]

hello . i have f22 and i only one yellow valve seen below. it is similar to the yellow valve seen in your video.

[@dpjplumbing]

It's possible you have a different type of filling loop, possibly the braided hose type. But without seeing it myself, it is difficult to confirm that

[@rzgr2487]

Hi,I have Glow warm Flexicom 18 sx,from this night it's not turning off ,and I switched off, when I switched on it's start to heat even if it's on off mode,what problem could be?Thank you in advance.

[@charliewiltshire6084]

Hi DPJ plumbing really helpful video, I have a question about the filling loop. My loop is letting by causing the system to gain pressure but I am having trouble finding any correct capping nut to remove the filling loop to stop it leaking into the system. Any idea if there are any specific products out there?

[@dpjplumbing]

Hi, I've found it's a common problem with these filling loops that they end up both passing and slowly causing the pressure to rise above 3bar. You then get the symptom of water dripping out the overflow pipe. I haven't found a blank that fits onto the filling loop threads myself. The local merchants don't have anything that fits and I've not got anything in my odd bits box either. I end up changing both the cold inlet and heating valve, so that my customers can easily fill the system without having to reconnect the filling loop every time it needs topping up. Apologies I can't help you any further. You will most likely be able to get a blank but it might be some trial and error. Cheers, Dan DPJ Plumbing Heating and Gas

[@je6874]

What’s the difference between this and the flexicom 18sx model? Regarding locating the valves. Thanks for the video.

[@dpjplumbing]

I think the sx model is a system boiler, whereas this is a combi boiler. The main difference is that a system boiler heats a cylinder of hot water. A combi heats hot water up inside the boiler. So the sx wouldn't need a cold water supply or a hot water outlet. This means, usually the filling loop is located externally. Hope that helps. Cheers, Dan DPJ Plumbing Heating and Gas

[@je6874]

@@dpjplumbing Thank you for your quick reply, much appreciated! By externally, I assume this can mean in a different location to the boiler itself?

[@dpjplumbing]

@@je6874 yes. What I meant by externally is not part of the boiler. It's usually a chrome braided hose with one or two isolation valves (this is the most common method but I've seen lots of weird and wonderful plumbing bodges) Most commonly it'll be below the boiler or where the cylinder is. But again, I've seen them put in the back of cupboards that noone even knew about. Hope that helps.

[@alanb193]

Hello My problem is the boiler keeps loosing Pressure quickly Can’t have a shower as it goes from 1.0bar to 0.3 then 0.0 rather quickly

[@dpjplumbing]

You've got a leak somewhere on your heating system. Could be to do with your boiler or pipework/radiators. Check to see if the outside copper pipe is leaking

[@alanb193]

Yes was a leak 👍. Turns out it was at the Water filter

[@dpjplumbing]

@@alanb193 thanks for the update. I'm glad you managed to find it and sort it out! Cheers!

[@LorraineHainey]

Hi Dan just a quick question ❓ is it a veey bad sign to have the pressure fall to 0.2 bar ? Doew it mean my valves are cappoot? Thanks again 👍

[@dpjplumbing]

Hi, From what you are saying, it sounds like you have a leak somewhere. As long as the valves let you fill it up then there shouldn't be an issue with the valves. If you are getting pressure in the system but the digital display does not increase. It could be a faulty pressure gauge.....these are a common issue on these boilers. I would need to see it myself to diagnose that issue. Thanks, Dan

[@sobiahanif7462]

hi wondering if you could help i have code f14 on this same boiler have been resetting often now the reset button doesn’t not work as it has fell out and my screen is showing nothing what can i do to fix this

[@dpjplumbing]

Hi, There are a few things an f14 error code could be. One of those things is some sort of blockage, stopping the flow of the heating system. Possibly a faulty boiler component. I'd advise getting a gas safe engineer to take a look. Hope you get it sorted quickly!

[@kevincurley5065]

When I open the 2nd tap it doesn't pressurise. There def water goin to ot but no noise of flow like in you're video

[@dpjplumbing]

Apologies, only just seen this comment. Did you get it sorted in the end?

[@kevincurley5065]

I haven't. System is still working at 0.7bar but if like to set it to 1... Strange when that valve on the left hand side is opened there is no flow??

[@dpjplumbing]

@@kevincurley5065 it does sound strange. There's a few things that could be happening but without seeing it in person it's hard to diagnose. If the pressure does rise when opened then I would assume it work as it should. The sound of the water flowing doesn't always happen, flow rate and water pressure can make the noise happen or not. If it's not pressurising at all, you could have a faulty valve or tap but again, I would need to see/test it to confirm. I know I've replaced a fair few of the glowworm valves due to them failing and passing water, don't think I've changed any for not opening up. Cheers

[@nikosmeletopoulos3272]

thanks mate ❤️❤️❤️

[@TheVividProject]

I got the same one but whenever i open the taps it won't fill up, i even waited 10 minutes, no changes at all, what could it be? .

[@dpjplumbing]

I'm not sure what the reason could be without seeing it. If it's got plastic handles, they could round off and not be opening the valve.

[@alanb193]

Brilliant cheers 👍👍

[@dpjplumbing]

Thanks for the comment, glad it helped you out 👍

[@alanb193]

@@dpjplumbing Strange thing was I tried this yesterday Before I’d seen your Video and noway could I get the tap on the Right to move “it was Solid!

[@catherinemcmillan6884]

I followed all steps but now mines says F.4 after trying this before it was stuck at 0.5?

[@dpjplumbing]

The F4 fault code on a Glow-worm boiler indicates an ignition problem. This means the boiler is having trouble igniting, which can prevent it from providing hot water and central heating. Causes Faulty ignition electrode: The electrode may be worn out and need replacing Blocked burner: A blockage can prevent the boiler from igniting properly Faulty gas valve: A stuck gas valve can prevent gas from reaching the burner Low gas pressure: The boiler may not be getting enough gas Dirty spark generator: The spark generator may need cleaning or professional attention Wiring or connection problems: Loose or damaged connections can disrupt the electrical signals that tell the boiler if a flame is present Solution To fix an F4 fault, you should call a Gas Safe registered engineer. They can assess and rectify the issue, which may involve cleaning or replacing parts, checking the gas flow, or troubleshooting electrical issues. Safety The F4 fault code locks out the boiler to prevent unsafe operation, such as gas leaks or overheating. You should never try to fix a gas appliance yourself. Sorry I can't be much more help

[@Laury777]

Thank you!

[@dpjplumbing]

Thanks for the comment, glad it helped you out 👍

[@jed7200]

Had to bleed my system to replace the filling loop due to pressure nonstop increasing. Refilled, bled rads etc. Now the opposite problem, losing pressure everyday and copper pipe outside throwing water out. Can draining system depressurise expansion vessle? This was only checked last month and was fine :/

[@dpjplumbing]

Sounds like your pressure relief valve is throwing water out. If it's leaking even when system hasn't been on then I would guess that the Pressure Relief Valve has gone faulty and continuously passing. This would need replacing. But without seeing it myself, I couldn't say for sure. Just going off what you're saying. As a few things can cause the PRV to activate. I know from experience that glowworm pressure vessels tend to go faulty /spilt but the symptom for this is that the PRV would activate when the heating system is really hot and the pressure has built up (3bar+). Then when the heating system goes cold and contracts the pressure would drop to zero. Hope that helps.

[@dpjplumbing]

Sometimes if you've got a lot of air in the system, that can act as a pressure vessel. When you bleed it and remove the air it can cause pressure issues if the expansion vessel is faulty.

[@jed7200]

@@dpjplumbing thanks so much for your reply. How strange no water was being thrown out before when pressure was increasing, ill get the expansion vessel checked and inflated, maybe for the cost of a pressure relief valve it may be worth replacing! Thanks mate

[@dpjplumbing]

@@jed7200 because of how the PRV works, once they release, sometimes muck and debris can get into the seal. This will stop the PRV seal sitting correctly, which allows water to pass. Sometimes when they start leaking, the only option is to replace. I know usually with glowworm and vaillant (same parts) if the expansion vessel fails and PRV activates, I always replace the PRV as it's only £20ish and I've already got the boiler drained for the expansion vessel. This is because I've done a few where I've replaced the vessel and the PRV just continues to leak, even when cleaned.

[@jed7200]

@@dpjplumbing i think this is definitely on the money. Thanks so much! I did initially look to replace vessel but plumber who came to do it found the valve was just leaking air so he replaced the valve and repressurised. However, after 3 visits he was still unable to diagnose why my boiler was going up 0.1bar every day. I detahced filling loop, low and behold water dripping from inlet valve. I replaced water inlet valve for filling loop myself, no more dripping and valve now isolates. Makes sense as the system had a good flush that that X800 stuff as that was his second visit idea that sludge was cause of the increasing pressure! Oh well, hopefully it’s swapping out the PRV, ill order a PRV, shame you are not closer to me!!

[@DavidWalsh-r2s]

Hi, the pressure display does not come up on boiler i tried everything no pressure is showing had to tread a gauge into top of rad to get reading also.. exact same boiler

[@dpjplumbing]

Could be the pressure sensor not picking up the pressure any more. Difficult for me to give you a proper answer without seeing it and testing it myself

[@DavidWalsh-r2s]

Thanks so much for the reply I was thinking the same myself something has to be amiss.. another issue with boiler is it rises to temperature very fast now i have drained and flushed the system changed all the rad valves. Iv noticed if you have maybe 3 or 4 rads of the 9 that are in the house on and others off. They heat away fine but if all on they struggle to heat. And even with just the 3 or 4 rads on the boiler still rises very fast cuts in and out.. would you be thinking the pump? Only issue, its an internal pump and i am not gas registered to be interfering with boiler...thanks

[@dpjplumbing]

@@DavidWalsh-r2s it's difficult to give you a straight answer without seeing the boiler and heating system myself. It could be the pump or another blockage of some sort. To change parts inside a boiler you should be Gas Safe Registered as removing the case, removes the seal to the boiler. There could be issues with the boiler only a Gas Safe Engineer would recognise and test for. These issues could potentially be life threatening.

[@justamanl]

I’ve only got one valve on nmy glow worm flexi

[@dpjplumbing]

Difficult to advise without seeing it.

[@lukaskytyr2961]

Hello What’s mean F5 error Thank you

[@dpjplumbing]

Hi, This is what a quick google of F5 error code means: The F5 error code on a Glow-worm boiler indicates that the boiler is overheating. This fault prevents the boiler from working to prevent damage to itself. Causes low water flow, faulty thermistor, blocked heat exchanger, limescale build-up, and airway blockages. Risks damage to the boiler's internal components and risk of fires. Safety It's unsafe to operate the boiler with this fault You should use a Gas Safe registered engineer to diagnose and fix the fault How to fix A Gas Safe registered engineer can diagnose and fix the fault Regular professional maintenance can help prevent the fault I would say you’ve got some sort of blockage or flow issue causing the f5 fault …. But without seeing it myself I can’t say for sure

[@johnwalker8110]

Went to do this but there is only one tap on the right hand side visible and I can't feel any others :-(

[@dpjplumbing]

You might have a braided hose type filling loop somewhere else on the pipework

[@johnwalker8110]

@@dpjplumbing Cannot see anything like that either

[@johnwalker8110]

@@dpjplumbing there vis only the right side tap sticking out of a full width boxed area I cannot see into the box

[@demihowey-drnk-3307]

Mine comes up f9 and when I try this method no numbers come up and no noise is made

[@dpjplumbing]

Some Glowworm boilers use an internal digital pressure sensor to detect the system pressure. These pressure sensors suffer from getting blocked with debris and stop working. If it's stopped working because of debris/faulty sensor it will need replacing. Usually I identify this issue when I top the pressure up and the boiler does not sense it. It could be something else causing this issue, our advice is to get a Boiler Repair Engineer to correctly diagnose the fault and repair it. Hope that helps explain what might be happening. Cheers, Dan DPJ Plumbing Heating and Gas

[@dpjplumbing]

Or there could be something wrong with the filling loop or the way you're filling it up. But I was assuming you're doing everything the video is showing you

[@daviddent2641]

Same.

[@dpjplumbing]

@@daviddent2641 if you've managed to pressurise the system but the boiler continues to show F9, which is a low pressure fault, it could possibly be because the pressure sensor is faulty. I can't diagnose issues like this via messages. I'd need to inspect the boiler myself to ensure all the basics are right. But I've had to replace a fair few pressure sensors in glowworm and vaillant boilers as they get clogged up with debris and no longer read the system pressure correctly

[@albert.d0]

I have f 22,can anyone help? Please

[@dpjplumbing]

If it's f22 and you've topped up the pressure but still shows low pressure, it's either the pressure sensor has stopped working (very common on these) or youve got a leak. You'd need a gas safe engineer to change the pressure sensor

[@crystal4628]

Nope didn't help. My boiler pressure keeps dropping going back to 00.

[@dpjplumbing]

Does it drop straight away? Or after the heating has been used?

[@crystal4628]

@@dpjplumbing yeah it does actually drop straight away

[@crystal4628]

My hot water is on for like a few minutes then it goes back to 00 where I no longer have hot water and I have to keep pressuring it up.

[@dpjplumbing]

@@crystal4628 you've got a leak somewhere on your system by the sounds of it, as it's losing pressure that fast. Could be something to do with the boiler or it could be something to do with your heating system. Without seeing it myself, I can't tell you want it is

[@crystal4628]

@@dpjplumbing There is no leak causing the pressure fluctuations in my boiler.

[@gurutejkn8135]

I have no values to turn

[@dpjplumbing]

You might have a different type of filling loop installed. Sometimes you might have a braided hose type filling loop installed which is on the pipework of the heating system instead. But without seeing your system, I cannot advise if this is the case.

[@mzjamaicamee9998]

Theres no water coming from my hot tap

[@dpjplumbing]

You may have turned off the isolation valve under the boiler for the cold/hot water. This would turn off the hot water to the whole of your house

[@devenchohan2872]

1.5 👎

[@dpjplumbing]

?