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I have tried this anyway and it works - but power only, switch didn't respond to any settings. I bought simple immersion heater timer (your suggestion) in B&Q and it works just fine. These timers are simple and doesn't have many features like the other ones. Anyway, Thanks again.

Oh dear! World Champion in the field of electronics. That's why I'm here!

Right, good to know. Thanks anyway!

I see... This boiler is simple for heating water to whole flat (150 liters capacity) - ELSON Coral E. Not for central heating. is it not combi?! :( I hope it's still possible to use this timer... Please advise.

I'm sure I have a combi one. Would it be a problem if not? I assume that the timer would just not be working properly.

Thanks EFLImpudence! Should I keep 2 and 3 terminals blank? Or connect them together with "U"?

Thanks ericmark! I would never come up with this connection. Looks very different to me. I'll try today.

Thanks ericmark! I have checked the boiler and looks like this timer is compatible with my boiler. Could you please tell me which cables should be connected to which ports, as per my image?

Hi all, Could you please help me to connect my Honeywell ST9100S? I'm total dummy to electric stuff and don't understand the scheme. I have a red, black and yellow-green cable from wall power point and blue, brown and yellow-green cable from boiler. Thanks a lot.

Hi all,<br>Could you please help me to connect my Honeywell ST9100S? I'm total dummy to electric stuff and don't understand the scheme. <br>I have a red, black and yellow-green cable from wall power point and blue, brown and yellow-green cable from boiler.<br>Thanks a lot.<br>