Vaillant VRT 340f room stat - error message

[Neil Sutherland]

Hi all,
I have a Vaillant VRT 340f wireless programmable room stat - the early version without the dial. I've just changed the batteries (2xAAA) - something I've done several times before - and now the display just shows 'Err'. I've tried leaving the batteries out for a few minutes and then reinstalling them, but to no avail. Does anyone have experience of these devices?

 

[Harvest Fields]

Normally means communication error.

 

[Brambles]

Normally a battery issue is a BATT error code.

Check that the base receiver has power and is operating.

Fit the remote with new quality (Duracell Plus type) batteries. Place the remote unit within a 2m clear line of sight of the base receiver.

If you still get the RF ERR code, you need to clear and rebind the units.

In my experience, they rarely fail, a rebind normally cures the issue.

 

[Neil Sutherland]

Thanks for the rapid response! I’m slightly mystified that the unit shows ‘Err’ alone without any qualifier such as ‘RF’, but hey-ho. Rebinding sounds like a good idea, but how do I do that?

 

[Harvest Fields]

Thanks for the rapid response! I’m slightly mystified that the unit shows ‘Err’ alone without any qualifier such as ‘RF’, but hey-ho. Rebinding sounds like a good idea, but how do I do that?

Is it wireless? Cannot remember if the old one is wired?

 

[Neil Sutherland]

Yes, it’s wireless. Working fine until the battery change. After the change the receiver on the boiler was showing a red light, but that cleared when I pressed the button and it now shows green as usual. Next I took the new batteries out of the room stat for a few minutes, but when I put them back I got the ‘Err’ message again.

 

[Harvest Fields]

Have you tried taking the batteries out and putting them back in again

 

[Burger]

Have you tried taking the batteries out and putting them back in again

Is that the same as any IT boffins response “turn it off and on again”?

 

[Brambles]

Neil

Reestablishing the RF link between the units is set out in the owners manual.

The 340f is a little odd - the two batteries are not connected. One feeds the LCD. display and the other the RF transmitter.

Check to ensure that both batteries are inserted correctly, that there has been not leakage from the old batteries and that you have at least 1.5v across each set of terminals.

Don’t be misled into thinking that because the display is functioning, both batteries are installed correctly with enough power

 

[Neil Sutherland]

Still no luck, so I called the Vaillant helpline today. The response was that there's no fix, and the unit will have to be replaced. Great. So now I'm on the lookout for a compatible unit; ideally one that will use the existing receiver but otherwise one that I can plug into the boiler connections. I've asked the question of Vaillant by web form, but if anyone knows what might work I'd love to hear from you. I imagine the later VRT 340f should work, but the only one on eBay is £350. There has to be a cheaper option!