Having read all these threads, it would appear that I have been particularly lucky with my two year old Brookline BKL20 Optimyst fire. It has worked without any of the faults described by the numerous contributors to this forum, until about three weeks ago. I then had two of the lamp holders fail but, once replaced with a cheap set of (better quality) ebay items, the lamps have continued to function as expected.
I thought that, hopefully, this might be my only misfortune with the fire, until this weekend, after having carried out the regular two week cleaning procedure, I reassembled the components, only to find that when I tried to operate the fire I immediately got two beeps from it and absolutely nothing else; no lamps, no misting, no fan noise. Repeated attempts at trying to start it results in the same issue. Others have said that they have experienced a similar issue, but they get this result after 30 seconds, whereas my problem occurs immediately I try to switch the fire on.
It sounds like the audible warning it produces when it has run out of water, so am I correct in assuming that whatever senses that water is present in the sump, may have developed a fault, or is it more likely that a control board has decided not to work, despite functioning perfectly prior to my taking the components out for cleaning? Everything inside looks like it should do; no obvious burnt or damaged components. But it clearly has something wrong with it. If anyone can shed any light on the matter I should appreciate the feedback. This particular model has the grey sump and blue water tank, so is the older design apparently.