EBME Forums Forums Maintenance Technical Assistance TUTTNAUER 3870E NOT WORKING CORRECTLY

Thanks for the advice, let´s see how it goes. I have already changed the Fuseholder for a new one, and is working for the other cycles, only if a choose the drying cycle is the problem

Going crazy with this unit. I start the day and choose the drying option, the unit blocks itself and does nothing, so just turn it off. COme back again next day in the morning, turn the unit ON and it starts the drying cycle on itself, its like it is picking up what did not do the day before?

Maybe a defective EPROM?

Have you had a good dig around the solid-state relay that controls the drying fan? Looking at the diagram, that is (should be) the only way the drying fan gets energised.

Yes, the SSR are working perfectly, and as I say, it only doesnt work when you select a Dry Only program, but the drying pump works when the drying is part of a Sterilization cycle.

..any development?

Waiting on a new EPROM, hope this will solve the issue.

...let us Know.

Just replaced the Eprom, now the crying cycle works very well. I recalibrated the income water time which was 140s to 40s, but now 2 new problems arised, one is with the water, the unit starts the water pump for the set time, stops 1s then turn on again the water pump for 20-25s more. The other problem is that the unit reaches 134° but pressure seems to be a little down for that temp. and once the temp is reached, it doesnt go into sterilization time????
When the cycles are for 121° is working just fine. Going crazy with this unit.

How come Eprom is the problem? maybe there's something else or there's a reason why?

For the lack of pressure I found a small crack in the door gasket, we will see how it goes after we replace it.