Viessmann vitodens 100-w, making single bang

[obtc101]

Hello,

Looking for some help with my 5 month old combi viessmann pls (vitodens 100, 35kw). It was professionally installed in November. Already had 1 issue so far when the ignition cable needed to be replaced by manufacturer engineer. Then was working fine for last 2 months.

Last week some of the downstairs rads were not getting hot, isolated to those furthest from the circuit. Bled all of them in the house and hardly any air came out. then decided to finally re-balance the system as one of the downstairs rads had always been belting out and it had annoyed me.

Rebalance worked and all rads now warming up and relatively stable.

However the rebalance seems to have introduced a new problem. There's now a single loud bang coming from the boiler, once the wall thermostat is up to temp, (honeywell) and it stops asking for heat. doesn't happen every time the heating shuts off.

Any help appreciated. When the boiler is cold pressure is just a sniff above 1 bar pressure, and temp on boiler display for rads reaches up to 74 degrees,

Thanks

 

[75pete]

I think I would look to get the boiler installer back to check it as its only a few months old.

 

[Mr_T25]

I recently bought the b1ld010 combi (Vitodens 100-W 35kw too). Does your have the built in 46 litre storage cylinder?
How do you rate the boiler apart from this one issue?

 

[Phill Peck]

Hello,

Looking for some help with my 5 month old combi viessmann pls (vitodens 100, 35kw). It was professionally installed in November. Already had 1 issue so far when the ignition cable needed to be replaced by manufacturer engineer. Then was working fine for last 2 months.

Last week some of the downstairs rads were not getting hot, isolated to those furthest from the circuit. Bled all of them in the house and hardly any air came out. then decided to finally re-balance the system as one of the downstairs rads had always been belting out and it had annoyed me.

Rebalance worked and all rads now warming up and relatively stable.

However the rebalance seems to have introduced a new problem. There's now a single loud bang coming from the boiler, once the wall thermostat is up to temp, (honeywell) and it stops asking for heat. doesn't happen every time the heating shuts off.

Any help appreciated. When the boiler is cold pressure is just a sniff above 1 bar pressure, and temp on boiler display for rads reaches up to 74 degrees,

Thanks

Are you on 1 heating zone or 2?

 

[Phill Peck]

I recently bought the b1ld010 combi (Vitodens 100-W 35kw too). Does your have the built in 46 litre storage cylinder?
How do you rate the boiler apart from this one issue?

The 111 has a storage vessel.
Awesome boiler.

 

[Mr_T25]

On what basis do you think it is awesome?

 

[ianmcd]

Do you have any zone valves on your system ?

 

[obtc101]

I recently bought the b1ld010 combi (Vitodens 100-W 35kw too). Does your have the built in 46 litre storage cylinder?
How do you rate the boiler apart from this one issue?

Hi, sorry for delayed reply. We've got the B1HC, so I think it comes without the storage cylinder. So far it performs as I'd expect any boiler too, but with the ignition cable failing and it developing this new noise, not that impressed for the money and expectation it was a premium product. Albeit the noise may not be related to the boiler

 

[obtc101]

Are you on 1 heating zone or 2?

Hi, sorry for delayed reply, and thanks for your help.

Boiler heats the whole house, no zones. I recently opened up the lock shields on the rads a little more, and it seems to have reduced the noise a little. I've also cleaned out the magnetic filter (which was pretty clean)

Thanks

 

[obtc101]

Do you have any zone valves on your system ?

Hi thanks for your help, and sorry for delayed reply.

No zone valves on our system, boiler does the whole house.

Thanks

 

[Mr_T25]

I hope your boiler is not the one listed on the website with the outlined serial number (that has an issue / needs adjusting).

https://www.viessmanninstallerporta...l/SecurityNotice_Vitodens100-W 2017-12-08.pdf

 

[obtc101]

I hope your boiler is not the one listed on the website with the outlined serial number (that has an issue / needs adjusting).

https://www.viessmanninstallerportal.co.uk/AcademyFiles/Viessmann/General/SecurityNotice_Vitodens100-W 2017-12-08.pdf

Thanks for the flag, just checked and thankfully not mine. although serial number not a million miles off.