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ho...la... Thanks everyone so much, finally I got it, I took out the micro switch and enforce to be isolated, bang on! biscuit77, it is the sticky micro switch. Guys, if you are around Glasow sometime, I'd like to buy you some pints. I am an academic and enjoy DIY and sometimes probably too...

Thanks Agile and biscuit77 for the constructive suggestions. I think the suggestions are pointing something closer. 1. I do not know about the internal frost protection, I did only check if there is external one installed, which should lie just beside the timer switch if installed. For this...

dcawkwell, I think the frost thermostat sensor issue is a really possible logical reason because it can override the other switches, I just checked the boiler again now before I type this response, it appears it is not installed. thanks for the constructive suggestions!!!

I appreciated your quick response. On one hand, I can agree to certain degree about your attitude towards reconditioned PCB. The reason I choose the reconditioned PCB is: 1, The new one cost over 200 pounds, and reconditioned cost 70 pounds 2, I tend to believe those repair engineer...

Thanks for the promptly response. I did check the timer function first and the timer link appears functioning properly. I also disconnected the timer to ensure the link is broken (although it has been confirmed by meter), still the boiler will automatically fire up. Thanks again for your...

I hope someone here can give me a clue. My Vokera Excell 80E has been working for many years, it was under Scottish Gas Home care program for some years until recently they said spare parts are running low and they cannot guarantee any fix if problem happens. The problem did happen now...