Replacing central heating programmer?

maple41

Any tips on replacing a Honeywell ST6400 programmer? It works fine except that the backup battery (which is soldered onto the ciruit board) has failed, so it doesn't store the on/off times if there is a powercut. I am trying to avoid paying £50 for a new programmer, when the only fault is with the battery. Have phoned Honeywell to see if they do a refurb/ exchange, but the answer is NO.
Can anyone recommend an alternative, that does separate hot water and heating, different times and days, preferbly with a battery that can be changed. Ideally, also fits the standard back plate so I don't have to have an electrician in to rewire and make it an even bigger expensive job.
Any suggestions welcome.

Avoriaz

Have yopu tried ebay for a second hand identical or similar model?

£33 for a new one here

http://search.ebay.co.uk/search/search.dll?MfcISAPICommand=GetResult&ht=1&shortcut=0&from=R41&query=Honeywell+ST6400&category0=&Submit=Search

Keep searching for a week or two and maybe you will find a used one for peanuts.

espresso

Should be quite easy for anyone who can handle a soldering iron to replace the internal rechargeable battery for a few pounds. e.g here.

Fleeting_Glimpse

Go to a plumbers merchant (not plumb centre!) and ask about a replacement.
Most programmers have a universal back plate where a new programmer will just 'clip' on without touching the wiring.

icklejulez

I got a seconf hand potterton programmer off ebay and it is brilliant. Better than my old one and that was only 5 years old!