Megaflow Cylinder Problem

[j0n35y]

Hi, I had a Megaflow 170i cylinder and a Worcester system boiler fitted a few months back and for the past month or so whenever the hot water comes on from the timer there is a loud bang/pop kind of noise coming from inside the cylinder and it happens every few minutes for about half an hour. Its loud enough to be heard in the surrounding rooms.

Do you think the cylinder may have a fault, everything works fine no issues at all. I know they have safety features so that they don't explode but its still a bit worrying.

BTW I did regenerate the air gap but this made no difference. Only plus side I guess is I don't need an alarm anymore to wake me up in the mornings...

Thanks

Allan

 

[ShaunCorbs]

Time to get the person back who installed it for you

 

[j0n35y]

Hi, the plumber in question we are no longer in contact with as he messed us about on our bathroom job and we had to have it finished by someone else. Long story.....

I was just wondering what you guys thought and if anyone has come across this problem before. Our old Megaflo didn't make any noise that I can remember.

Thanks

 

[Best]

Could be a fault inside the Megaflow. If you think the noise is coming from inside the unit then contact Megaflow as it will be under warranty. That's if it is installed correctly and has been properly registered for building control and warranty

 

[Best]

Some units by other manufacturers have noise problem, but you need to contact Megaflow for solution.

 

[ShaunCorbs]

+ 1 to the above if you post a pic of the cylinder I'm sure the guys could give you a heads up if they see anything wrong

 

[j0n35y]

Thanks for the feedback here's a few pics.

 

[Chalked]

Thanks for the feedback here's a few pics.
View attachment 24435
View attachment 24436

Installation looks correct ( could be tidier but won't affect the way it works)
Firstly get the installer back to hear the noise.

 

[j0n35y]

Sorry for some reason they are showing sideways .

I few things I've tried, flushed system, bled and inhibited, cleaned magnafilter, recharged air pocket in cylinder, tried different speeds on pump from fast, slow and auto. No difference, system works perfect and hasn't lost pressure since being installed.

I guess next step is calling Megaflo.

 

[Chalked]

Shame they haven't connected the immersion heater up ad a backup!
Read your post properly and looking at the sysem, you bypass could be sticking As a test open the bypass fully ( under the red cover)

 

[j0n35y]

Thanks Chalked, Ill have a look at the bypass. We have some British Gas cover which I may use to get them out and have a look.

Earlier today I was next to the cylinder when it went bang and the noise was so loud it made me jump. I think it could be to do with the coils inside flexing and expanding when heating up, last thing I want is them failing and contaminating the hot water.

 

[Dotty]

Thanks Chalked, Ill have a look at the bypass. We have some British Gas cover which I may use to get them out and have a look.

Earlier today I was next to the cylinder when it went bang and the noise was so loud it made me jump. I think it could be to do with the coils inside flexing and expanding when heating up, last thing I want is them failing and contaminating the hot water.

Unlikely but not impossible. As said, providing the guy who installed it has notified it and sent off the warranty info to Megaflo, they should come out.

Unfortunately because you're not qualified to work on the thing at all (and this includes wiring up the immersion), we cannot really give you any advice other than that.

 

[j0n35y]

I appreciate all the help. I have fully opened the by pass valve and ill see how it is in the morning.

 

[SimonG]

Definitely sure it's from inside the cylinder and not from the coil pipework/2 port valve?

 

[Chalked]

Definitely sure it's from inside the cylinder and not from the coil pipework/2 port valve?

Honeywell valve fitted the tight way. Coil couldn't make that noise.

 

[SimonG]

Had clunky two ports before. Noise will transmit through pipework, coil and seem like its coming from cylinder.

 

[Chalked]

Had clunky two ports before. Noise will transmit through pipework, coil and seem like its coming from cylinder.

Me too, but with a Honeywell generally when fitted the wrong way round.

 

[SimonG]

Me too, but with a Honeywell generally when fitted the wrong way round.

Think you have it with the bypass. Must learn to read the threads from the start

 

[chris watkins]

Hi Allan
The problem is almost certainly with the pressure of the hot water not the heating. Did you have a older Megaflo replaced with this new one? As that would go someway to explain why there is an old composite valve set installed on the cold feed instead of the new one supplied with the new cylinder.

It is is old enough for it to have started to fail, the balanced cold supply has also been installed incorrectly (as there is no back flow protection.

Try to get installer back to install the new valve set supplied otherwise unfortunately you will need get a G3 pro in to install new one & alter the pipe work. No good calling Megaflo as incomplete / incorrect install.

 

[Neil K]

Money on 2 port fitted wrong way round

 

[Riley]

Diy?

 

[Chalked]

Money on 2 port fitted wrong way round

Pic says not :45:

 

[j0n35y]

Definitely sure it's from inside the cylinder and not from the coil pipework/2 port valve?

I'm pretty sure, heard the noise when I was next to it. Didn't seem like it was coming from anywhere else, but I could be wrong...

 

[j0n35y]

Hi Allan
The problem is almost certainly with the pressure of the hot water not the heating. Did you have a older Megaflo replaced with this new one? As that would go someway to explain why there is an old composite valve set installed on the cold feed instead of the new one supplied with the new cylinder.

It is is old enough for it to have started to fail, the balanced cold supply has also been installed incorrectly (as there is no back flow protection.

Try to get installer back to install the new valve set supplied otherwise unfortunately you will need get a G3 pro in to install new one & alter the pipe work. No good calling Megaflo as incomplete / incorrect install.

Hi Chris, yes we did have an old Megaflo, was similar model I believe. I'm honestly not surprised, I would never recommend him to anyone. If the noise is still there tomorrow that will be my next thing to look at. Thanks alot

 

[chris watkins]

Why change a Megaflo ? they have life time warrantee on the tanks, you only needed to replace the control valve set.

I know these things inside out you will need to get that valve changed & small amount of alteration to pipework.

unfortunately now you know why it is so important to only use persons who hold the Part G / un-vent ticket (ask to see it before they start), as required by Law.

 

[j0n35y]

Why change a Megaflo ? they have life time warrantee on the tanks, you only needed to replace the control valve set.

I know these things inside out you will need to get that valve changed & small amount of alteration to pipework.

unfortunately now you know why it is so important to only use persons who hold the Part G / un-vent ticket (ask to see it before they start), as required by Law.

It was only meant to be a boiler change. I asked him to check the system and he said that there where signs of a past leak on the tank showing me some white chalky marks around the bottom lip. We agreed to have it replaced but he never once said it was under a guarantee, just wanted more money out of me. :cuss:

Anyway I adjusted the bypass valve last night from 0.2 to 0.1 bar and still got a few pops this morning from tank. I adjusted it again to 0.6 bar and didn't get any noise when it came on this afternoon. I've now put it to around 0.4 bar this evening and still no noise. Could this really have been the culprit?

Also I don't think the Cold Water Combination Valve is faulty as I read you loose pressure when the spring goes and the pressure is great all round the house especially the mixer shower. Also the relief valve on the other side seems ok.

Definitely will get them changed soon seen kits online for around £140.

Thanks for the help.

 

[chris watkins]

It was only meant to be a boiler change. I asked him to check the system and he said that there where signs of a past leak on the tank showing me some white chalky marks around the bottom lip. We agreed to have it replaced but he never once said it was under a guarantee, just wanted more money out of me. :cuss:

Anyway I adjusted the bypass valve last night from 0.2 to 0.1 bar and still got a few pops this morning from tank. I adjusted it again to 0.6 bar and didn't get any noise when it came on this afternoon. I've now put it to around 0.4 bar this evening and still no noise. Could this really have been the culprit?

Also I don't think the Cold Water Combination Valve is faulty as I read you loose pressure when the spring goes and the pressure is great all round the house especially the mixer shower. Also the relief valve on the other side seems ok.

Definitely will get them changed soon seen kits online for around £140.

Thanks for the help.

OK thats find, you have just confirmed it for me, I suspect you either have or will attempt DIY, which as I have already stated is against the Law. So no more help from me & I would hope anyone else on this forum.

Get some one in who understands both the Megaflo's & can re- set a heating auto by-pass.

 

[Neil K]

+1 for Chris Watkins

 

[JCSPLUMBING]

An Auto bypass has to be set correctly. You may have turned it off or close to. If you have then bye bye boiler