Hello, I have an Ebac machine in the kitchen and have had no problems with it in over 20 years till recently. The problem was similar to yours i.e. electrically all was OK and the filters are washed regularly. Although you can clean the external filters and hoover the dust off the coils, the problem was the fins inside (behind the coils). We have a cat and we found that his hairs, together with dust had clogged the fins - simple as that. However, to get at the fins involved nearly taking the unit to bits.
Take off the external filter - then remove the outer casing (fiddly but doable) - then undo the screws that fix the cage/frame above the coils to the carcass. You might need another pair of hands at this stage to GENTLY nudge the coils out of the way while you use the nozzle attachment on your hoover to suck all the fluff etc out of the fins. We also did as much as we could from the front after removing the front grille as well. It will depend how much you can shift from the back. Re-assemble the cage/frame over the top of the coils and replace the outer casing of the unit. Lastly, replace the clean filter.
We were amazed at the difference and feel that we have got a new machine all over again. We had not noticed that the efficiency had dropped so low until we were not emptying the tank for over a couple of weeks. Now we empty it every 2/3 days as it is always on.
Do not attempt this unless you are confident in reassembling all the bits. Our attitude was "it was already broken, what have we got to lose?" Good luck
Shirley Hughes
April 2009