Viessmann Vitodens 050 No Heating

[Groover75]

Hello, I have one of these combi-boilers - two months old. Some time during last night the heating stopped working. Hot water still works. Pressure gauge shows zero.

Following the steps in the installation manual I closed the two heating valves, put the boiler into fill mode and refilled the heating circuit from the cold water feed (have a loop-back pipe) and got the pressure to 1.2 bar. Exit fill mode, opened the heating valves - pressure is holding steady.

However, still no heating - rads are all cold.

The outflow pipe to the rads is hot to the touch but I don't feel any vibration that I would expect from flowing water. Thermostat (Viessmann 100) is set to target of 27C and calling for rad heat (showing the rad symbol). Room temp is 16C. Wireless light on boiler occasionally flashes.

Both orange lights for rads and DHW are on.

I re-set the target rad water temp of 60C.

I re-paired the thermostat with the boiler.

The LCD display shows the tap symbol, a temperature (I presume the DHW temp) and an indicator at the bottom for I presume the gas. It does not show the rad symbol.

If I press the mode button it shows the rad symbol and "serv".

Any ideas what else to try? The manual isn't very useful and I couldn't find anything helpful about this particular boiler online. Thanks!!

 

[Phill Peck]

Press mode
Scroll to service
Press ok
Scroll up to 100 press ok.
Let us know if the rads heat up.

 

[Groover75]

Yes, that works! All rads heat up. After setting it back to 'off' the rads cool down again.

I can see that is just a test mode so I then checked the burner output setting and it is already on the maximum of 74%.

 

[Phill Peck]

Yes, that works! All rads heat up. After setting it back to 'off' the rads cool down again.

I can see that is just a test mode so I then checked the burner output setting and it is already on the maximum of 74%.

Then it’s a controls problem

Are your controls wired or wireless.

You can use service mode as a temporary feature. Set it to say 40% when the house is hot turn it off.

 

[Groover75]

Thanks for the reply. It's wireless control - Viessmann 100. The control unit shows that it is calling for heat, and the wireless light occasionally flashes. I also re-paired it with the boiler.

 

[Phill Peck]

Call Viessmann they will replace the control.
Tell them the model of the control to make sure they have one on the van.

Alternatively contact your installer.

If you were my customer I’d be getting a temporary control in for you until Viessmann attend if I didn’t have the correct Viessmann control in stock.

 

[Groover75]

Many thanks for the replies. The installer company is closed until Jan 2nd.

 

[Phill Peck]

Many thanks for the replies. The installer company is closed until Jan 2nd.

Call Viessmann depending on area it’s usually next day call. But could be longer this time of year.
What area are you in.

 

[AGAS]

Call Viessmann depending on area it’s usually next day call

that would even surprise me , want to put a sport mans bet on that

 

[Phill Peck]

that would even surprise me , want to put a sport mans bet on that

I did say could be longer this time of year.

Only once have I not been offered next day from Viessmann

 

[AGAS]

I did say could be longer this time of year.

Only once have I not been offered next day from Viessmann

ok a sports mans bet he won't get a visit before the 2th jan ,

 

[Phill Peck]

ok a sports mans bet he won't get a visit before the 2th jan ,

He probably won’t ill agree with u.

But I would

 

[AGAS]

hey ajayre what area you live because if phil is near by (Cambridgeshire) he might be able to help

 

[Dan Robinson]

hey ajayre what area you live because if phil is near by (Cambridgeshire) he might be able to help

How did you hyperlink Cambridgeshire?

Although when I click the linky it sends me to my company address

 

[AGAS]

How did you hyperlink Cambridgeshire?

Although when I click the linky it sends me to my company address

, i just copied the place name from under phil's avatar