Vaillant Boiler/ Central Heating - Advice please!

[Bernard2024]

I have a Vaillant EcoTec pro boiler, 3 years old. I had it serviced today for the first time and since the service, two radiators on the ground floor won’t heat up. Both furthest away from the boiler. One I’m told is a bypass radiator (?). All radiators upstairs (3 bed semi) are still working fine. I bled one and water came out immediately, there was no air/hissing. Is this just coincidence that they have stopped working or could the engineer have changed a setting during the service? Advice welcomed. I did call the engineer and he said the lack of heating has nothing to do with what he did with the boiler today. He said I should try and balance them. It’s just frustrating because they’ve worked perfectly for three years since the boiler was installed and suddenly stop working immediately after the service.

 

[Bernard2024]

I have a Vaillant EcoTec pro boiler, 3 years old. I had it serviced today for the first time and since the service, two radiators on the ground floor won’t heat up. Both furthest away from the boiler. One I’m told is a bypass radiator (?). All radiators upstairs (3 bed semi) are still working fine. I bled one and water came out immediately, there was no air/hissing. Is this just coincidence that they have stopped working or could the engineer have changed a setting during the service? Advice welcomed. I did call the engineer and he said the lack of heating has nothing to do with what he did with the boiler today. He said I should try and balance them. It’s just frustrating because they’ve worked perfectly for three years since the boiler was installed and suddenly stop working immediately after the service

 

[Deleted member 267285]

Can you post a photo of the underneath the boiler showing the valves? Seems unlikely that the service engineer has tampered with anything and is likely a coincidence

 

[Bernard2024]

Photos under the boiler

 

[Deleted member 267285]

Doesn’t look like a valve is closed. However, can you show the valve on the opposite side to where the cable enters, just to be certain?

 

[Bernard2024]

Not sure where I should be looking but…

 

[Deleted member 267285]

That’s good, valves both open. Was the boiler drained at all?

 

[terryplumb]

Close the TRV ( or wheel head valve if no TRV, don't touch their lockshield valves)on all radiators that heat up. See if cold rads now heat up.

 

[Bernard2024]

Not sure if it was drained. I just left him to it to do whatever a service entails.