RE: BOILER SWITCH 900 PROBLEM

[Wolverine747]

Hi Everyone,

RE: BOILER SWITCH 900 PROBLEM

I recently came across your great forum by accident and hence I have just joined as I'm after some HELP Please !!!

I currently have a Switchmaster 900 programmer fitted to my central heating system, controlling heating and hot water.

MY PROBLEM - The timer has ceased to function !!!

Can someone please recommend what would be either the best replacement for a Switchmaster 900 CentralHeatingController or if this is a fixable problem as my switch has never broken down before and if so what is the fix ?

If unfixable, then I would prefer an electro-mechanical version if possible otherwise a digital compatible, if no alternative is available, and also one that requires the least re-wiring.

Question #1 Is the problem Fixable ? What is the Fix ?

Question #2 How easy a task will it be with the different wiring system to fit ?

question #3 If unfixable - Which replacement item is best Mechanical or Digital and please advise model number and which type is best ?

Question #4 Where can I find one and how much would it cost as mine is old and hence may not make them anymore ?

Question #5 Where can I find a link or a copy of the original manual for the switchmaster 900 to get the original wiring diagram from....

Any help would be very much appreciated.

Thanks In advance

Wolverine747

 

[45yearsagasman]

Google is your friend.https://www.tlc-direct.co.uk/Technical/DataSheets/Horstmann/Horstmann_WiringGuide.pdf
It recommends either E/M or Digital models

 

[Wolverine747]

Thanks for the info 45yearsagasman – However, I have no idea which one to best choose.

I would prefer to replace the current version I have with a similar version if possible as I’m rather fond of the electro mechanical version and especially since I have had the Boiler for the last 10 years and this is the first time that I have had anything go wrong with it.

Can anyone please suggest or recommend where best to get hold of a replacement Switchmaster 900 please and how much it would cost ?

Thanks.
Wolverine747

 

[45yearsagasman]

The Tiara is E/M. There is a SH 900 on eBay.

 

[Wolverine747]

Dear All,

Can someone please advise me which Boiler Programmer would be best suited to purchase and is compatible and is also easy to fit and most reliable as a replacement for my faulty Switchmaster 900 from the list below as uinsure which one to choose:-

1. Danfoss 7 Day Digital Timer – FP715 si
2. Horstmann – Centaur Plus C21
3. Siemens RWB29
4. Horstmann 425 Tiara Programmer

Also how much I can expect to pay for one of these items.

Thanks.
Wolverine747