Where would a wireless thermostat receiver be..

[diydave99]

I’m hoping someone can help as our radiators aren’t working and BG can’t come until Monday.
I think the issue is with a rf205-ts wireless thermostat. If I sequence through the settings it shows 00 when displaying the address which I think means it can’t talk to the receiver which I’m expecting is a t55.

the manual says the t55 is the “boiler module”, but when I open our ideal logic s30 boiler I can’t see the device and the wiring diagram for the boiler on page makes me think it’s not wired directly to the boiler but to another device.

Any idea where I might find it if it’s not a stupid question ?

Many thanks,
Dave

 

[Elkato531]

You have a system boiler so the rf receiver will most likely be in the airing cupboard wired into the same junction box as the motorised valve(s).

 

[diydave99]

You have a system boiler so the rf receiver will most likely be in the airing cupboard wired into the same junction box as the motorised valve(s).

Thanks, I can see a motorised valve that goes from coil 1 on the cylinder the cable of which disappears into a small plastic junction box about the same size as a single light switch (but deeper maybe 2”) which seems to have 2 three (4?) core mains cables going into to it. Might it be in there ?

 

[diydave99]

Nope it’s not in that little junction box.

any other suggestions ?

 

[ianmcd]

post pics of everything in the cylinder cupboard

 

[stem]

which I’m expecting is a t55.

The T55 receiver would be for combi boilers where the receiver is usually fitted into the boiler itself.

System boilers have external control devices, so as has already been mentioned so you are looking for an external device with 3 small lights: Link / Load / Power

It does sound like you may have lost RF connection though. Have you replaced the thermostat batteries lately?

 

[diydave99]

Hi,
Thanks for posting the pics of the two different types of receivers.
Yes I replaced the batteries some weeks ago as there was a similar problem and it seemed to cure it. Last night I replaced them again with new Duracells when trying to sort the issue again.
I still can't find the receiver, here's what the cylinder cupboard looks like:

IMG_4697

• diydave99
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IMG_4696

• diydave99
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IMG_4695

• diydave99
• 14 Jan 2022

IMG_4694

• diydave99
• 14 Jan 2022

IMG_4693

• diydave99
• 14 Jan 2022

 

[CBW]

Can you post a photo of the boiler and it’s surroundings?

 

[Harry Bloomfield]

The receiver is not appearing in any of those photos.

 

[Agile]

A picture near the boiler might yield a clue!

As an aside when replacing batteries in a wireless thermostat you should use alkaline batteries and ideally Duracel as the transmitter uses a bit of current when sending the signal and cheap carbon batteries sometimes cannot manage the current.

 

[Harry Bloomfield]

As an aside when replacing batteries in a wireless thermostat you should use alkaline batteries and ideally Duracel as the transmitter uses a bit of current when sending the signal and cheap carbon batteries sometimes cannot manage the current.

Duracell are nowhere near as good as they used to be.

 

[diydave99]

Hi, Yes I used Duracel's thinking it might be cheap batteries causing the problem but it didn't appear to help.

Here's the photos around the boiler.

 

[Agile]

From under the boiler there is a cable going up to the left.

Where does that go to?

 

[CBW]

Only other logical place would be the kitchen

 

[Harry Bloomfield]

Only other logical place would be the kitchen

None of it is looking very logical - might this wireless stat perhaps have nothing at all to do with the system? Might there be no stat at all, or even a wired stat on the wall somewhere?