Siemens KG49NH90GB/01 Defrost issues

Hi all,

been browsing these forums and checking out youtube for a few weeks now with regards to problems with our Siemens Fridge Freezer.

Bit of background first.

We have the worlds smallest kitchen so about 7 years ago when looking for new appliances we decided that a 70cm wide, 2m tall fridge freezer would make best use of the limited space, did some research and went for the above model thinking Siemens is a good make. Would have loved an American FF, but space wouldn’t permit

https://www.siemens-home.bsh-group.com/ … KG49NH90GB

About 6 months ago the missus was complaining that some of the stuff in the fridge was freezing up. Even drinks in the top shelf could get a bit of ice forming so fiddled with the temperature settings and thought no more about it as it settled down.

About 5 weeks ago while having my frosties I noticed the milk wasn’t quite as cool as normal and eventually food was starting to spoil. Started trawling the forums and found that freezer air flow was likely issue and sure enough there was quite a bit of powdery ice built up in the evaporator. I also noticed that there was a bit of warping on the plastic cover over the evaporator at the top of the fridge freezer. This warping was causing the door to sit slightly proud if not firmly closed and with Kids in the house I put it down to that.

I did a quick manual defrost to clear most of the ice and used some tape to address the warping and the door now shut flush. This resolved the issue with the fridge being too warm for about 10 days after which the powdery ice started to build up again.

Next thing was a full 36 hr manual defost over a weekend and many towels later we were back in action again … but only for a fortnight until the ice was back. I also hacksawed off the warped plastic.

So now I’m thinking defrost is kaput and time to get testing. This weekend I stripped down the freezer and tested the defrost tray element, NTC sensor on the evaporator, thermal fuse (attached to the back of evaporator which was surprise – I thought it might be on the defrost element) and the fan.

I got a reading of 208ohms on the defrost tray element, but nada, zilch, diddly squat on the NTC sensor, thermal fuse and Fan. No reading at all. The fan was a blow as costs £113 quid to replace. At this point I was doubting my test equipment or myself – 3 things on the blink? So I took the NTC sensor and thermal fuse in to work to test and still no reading.

The freezer was reassembled sans NTC and thermal fuse and freezer and fridge up and working again, albeit temporarily.

When I open and close the freezer of fridge door I was sure I could hear the fan go on and off so I pulled all the trays out and stuck my head in and sure enough the fan that was giving me no readings is in fact starting up and turning off with the door. I can even feel the air being blown in. Happy days, so possibly £113 quid saved, but why no reading on my multimeter?

Few questions: Does 208 Ohms sound about right for this defrost element? ( https://www.siemens-home.bsh-group.com/ … t/00741650 ) I read elsewehere that 10 – 140Ohms was about right for a defrost element and have no tech specs to compare against

Why no reading on the fan? User error on my part?