Looking for a replacement Central Heating Timer (Ed.)

[Kurtis Blow]

Hi
I have a Baxi Bermuda SL2 which is controlled by a TRAC TPE20. The TPE is playing up so I need to replace it. Any suggestions please would be appreciated. Reading online it seems a lot of controllers slot onto a back plate so if there’s a controller out there that would slot onto my TPE20 back plate, that would be great!
Thanks

 

[CBW]

A quick internet search suggests it is an industry standard backplate, so any offering these would suffice. Plenty on the market, so depends on what you want and how you want to control it, eg via phone. I know this is a 10, but should imagine similar?

 

[Kurtis Blow]

Thanks CBW. So when I look at alternative models, what part of the specification will tell me that it’s an ‘industry standard’ timer?

 

[CBW]

Thanks CBW. So when I look at alternative models, what part of the specification will tell me that it’s an ‘industry standard’ timer?

Should be in the specifications, not always listed on sellers website eg: https://www.draytoncontrols.co.uk/product/lp522, but on toolstation website no mention of it!

 

[Kurtis Blow]

Top man, thanks again

 

[Kurtis Blow]

CBW, someone on the Screwfix site is suggesting that if I use an LP522 I’ll need to change the backplate and swap 2 wires….

 

[JohnD]

last time I bought a programmer, it came with a conversion chart for connections on old programmers you might be replacing, and by emailing the makers, they would provide the connections for lots of others.

It would have been a Honeywell or a Drayton.

I expect ACL Drayton will tell you for the LP.

 

[CBW]

CBW, someone on the Screwfix site is suggesting that if I use an LP522 I’ll need to change the backplate and swap 2 wires….

I’m not entirely sure tbh, but going off what you have I’d disagree. Here is the chart @JohnD is referring to for Drayton, unfortunately yours isn’t listed at all: https://www.draytoncontrols.co.uk/sites/default/files/D70-9 - Compatibility Guide.pdf

 

[CBW]

CBW, someone on the Screwfix site is suggesting that if I use an LP522 I’ll need to change the backplate and swap 2 wires….

Can you post a link?

 

[Kurtis Blow]

So I’ve just fitted the new LP522 but the back plates weren’t compatible. Luckily it was a case of just transferring the wires from the terminals on the original back plate to the terminals on the new one. The boiler fired up initially and started sending hot water to the rads but then the boiler cut out but the pump kept going! Typical!! Bizarrely the boiler fires up for the hot water….

 

[Kurtis Blow]

Photos from old and new instructions

 

[CBW]

Apologies, bit of a faux pas. Pumps are known for continuing, it’s called pump overrun. Are you saying one circuit isn’t working? Was the Trac set to gravity?

 

[Kurtis Blow]

Drayton LP522 2-Channel Digital Programmer - Screwfix

Order online at Screwfix.com. 4-wire installation. Override facility. Automatic BST/GMT time change. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

 

[CBW]

Drayton LP522 2-Channel Digital Programmer - Screwfix

Order online at Screwfix.com. 4-wire installation. Override facility. Automatic BST/GMT time change. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

Not sure why you’ve inked to the product, you’ve already said what you have.

 

[Kurtis Blow]

Yes, this little switch shown circled green