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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> What is this white box? https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1519760203 Message started by Phil the Fluter on Feb 27^th, 2018, 7:36pm

Title: What is this white box?
Post by Phil the Fluter on Feb 27^th, 2018, 7:36pm

On the wall next to my Baxi boiler is an on-off switch identical to several light switches in my garage.

Adjacent to the switch is a similar sized white box that has two very small lights, one above the other. Next to these lights is a small grey pushbutton.

The upper light is green when it is lit.

I've never seen the l lower light lit.

Can anyone tell me what this box is, what the lights indicate and what the grey button does?

Title: Re: What is this white box?
Post by thescruff on Feb 27^th, 2018, 10:29pm

Sounds like a receiver for the wireless room stat, is there a make/model anywhere.

Otherwise can you post a pic

Title: Re: What is this white box?
Post by Phil the Fluter on Feb 28^th, 2018, 12:40am

There is absolutely nothing written or printed on the white box to give anybody a clue what it is or what it's for.

[gallery]Phil_the_Fluter/1519778318.jpg[/gallery]

Title: Re: What is this white box?
Post by thescruff on Feb 28^th, 2018, 9:22am

It's a Honeywell BDR91 receiver for a wireless room stat.

The switch is most likely to isolate the boiler and accessories, should be fused 5amp.

Title: Re: What is this white box?
Post by londonman on Feb 28^th, 2018, 9:53am

It's exactly what The Scruff says it is. The receiver part for a wireless room thermostat and/or programmer. There should be a separate piece of kit - not connected to anything - battery powered. Could be anywhere in the house/flat. It will have some pushbuttons and a small screen/display.

The green light indicates that the mains is on. The light underneath will come on when the thermostat/programmer wants some heat.

The grey button overrides the wishes of the thermostat/programmer and allows you to turn the heating on by pressing it.

Title: Re: What is this white box?
Post by Phil the Fluter on Feb 28^th, 2018, 12:56pm

Thanks, guys.

Very useful info!