"Mr Pounder Esquire" wrote in message
news
Brian Reay wrote:
On 29/09/2017 17:30, Bob Minchin wrote:

I have a Bosch full height upright freezer that is (meant to be)
frost free. It has the evaporator at the top and a fan blows air
around the cabinet to freezer the contents. Normally as good as good
and anytime you look at the evaporator it is either completely clear
or the slightest film of frost visible.

How do these things work? I assume that there is an electrical
heater on the evaporator that comes on after the compressor switches
off to melt the frost and the water drains away. If there is cooling
demand, it either abandons the defrost if unfinished or perhaps
allows it to finish and then commences cooling?

Am I on track?

The problem is that I noticed that the frost had built up seriously a
few weeks back and the temperature was rising inside. We *think* that
the door had got left ajar but no-one will confess to this.
I then spent some time playing a hot air gun over the evaporator
melted all the visible frost and after switching back on normal
temperature was achieved.

But slowly over a period of weeks, the frost has been building up but
the temperature has been maintained ok.

I can imagine a conflict between the defrost process and the demand
for cooling. Maybe the defrost part uses a 'just above zero" temp
sensor to signify frost clear and that is conflicting with the
cooling cycle? I wonder if the heating cooling algorithm can't cope with
the
remains of ice that I did not melt away fully and it is slowly
building up again or perhaps if the heating element has failed.

In normal use (without the door being left ajar!) the only source of
frost should be a bit of warm air let in when the door opens and so
it does not need a huge defrost capability.

I have had one suggestion of letting the whole thing defrost
naturally over a couple of days, but the trouble is that it holds
the vast proportion of our frozen food stock and we would need a
dedicated feeding frenzy over several weeks to empty the thing.

Thanks if you have read this far!
Any suggestions please folks?


We had this some years back on a Whirlpool- it took their engineers
ages to fix it - it was a simple timer sticking. We lost several
freezer loads of food, it cost Whirlpool a fortunate.

As for defrosting manually, we 'turn around' ours in half a day or
so. We have several freezers (we stock up on meat, fish etc at
CostCo) and run one down so we can defrost one.

I defrost our conventional fridge freezer four times per year using a hair
dryer. It takes less than 30 minutes to do this and gives me the chance to
clean all of the drawers, chuck out of date stuff and clean the inside of
the cabinet and the seals. People with frost free will probably not clean
etc as they see no need.

Yes, I don’t bother.

Sad is this.

Even sillier than you usually manage.

There is no way that a frost free appliance will ever enter our kitchen.

Yes, you are that terminal a ****wit.

Apart from insulation failure which is very rare these day there are two
things that can fail with my conventional fridge freezer - thermostat =
£10 or less ---- compressor which is end of days.

Havent had any of mine fail, ever.

Now, take a look at the workings of a frost free lump of ****

Mine have been fine for over a decade now.