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Hello,
My APM6855 is displaying erratic freezer temperatures which makes me think the temperature probe is faulty (or maybe PCB). I thought I’d try replacing the probe first and see how it goes.
Is there a proper name for this component – it’s the small white rectangular probe attached to the cooling unit? Freezer ambient sensor? Just trying to buy the correct thing. It’s in the centre of the first photo. Disconnecting and the display indicates ‘E’ for the freezer temp.
http://picasaweb.google.co.uk/mrfreezer5/Repairs#
I think it will be difficult to extract probe through the wiring hole.
Any help appreciated,
thanks
MattRe: Name of white probe in freezer unit (Schreiber APM6855)
There are two probes in the appliance, one that measures ambient temp and one that measures evaporator temp – and yes they are called probes.
Re: Name of white probe in freezer unit (Schreiber APM6855)
Hello Mattim
I have same problem with APM6855, fridge not cooling and freezer slave element icing up, display flashing “H”. Tried the defrost method, problem returmed 4 weeks later. So I bit the bullet and bought a no frost radiator probe from http://www.argospares.co.uk (product cde SER502023500) for £22 inc post. Looked a bit different (not flat and with a red dot on the end) from the original, which looked just like your photo.
I wasn’t sure how to fit, and didn’t have to confidence to take the radiator element off the back so I cut the wire and fitted with a terminal block connector (i know not ideal, but I wrapped it well, and re-puttied). Any-road-up fridge now works but freezer displays “E” and took an age to cool when switched on.
Anyone know whats wrong (apart from operator incompitance) and do I need to take the radiator off the rear to fit the probe properly? ❓
Re: Name of white probe in freezer unit (Schreiber APM6855)
In my experience, replacing the thermistors (the proper name for the probes) is an exercise in wishful thinking on these machines. They very rarely fail, hence they’re not listed on the shop as there’s no point listing what isn’t required. 😉
The common failure on those machines is the PCB, which you can find HERE
But since it is an NTC that works on a resistance value cutting or hacking up the wiring will report a false value to the PCB, the resistance will alter as you’ve hacked up the cabling. Therefore the one you’ve just put in, toss it in the bin as it’s now useless due to that. The board will get a false signal and do stranger things that the original fault I expect.
Oh and the original thermistor is now useless for the exact same reason as well.
Sorry to be the bearer of bad news.
If you want the part listed on the shop, no problem, I can do that for you. The real price, from us, is about £10 less than you paid.
Again, sorry to the bearer of bad news.
K.
Re: Name of white probe in freezer unit (Schreiber APM6855)
I’ve never done one so I’m not sure. 😉
Usually it’s just a case of taking one out and replacing it. If that entails swinging the condenser out the way then that’s what’s got to happen, just be careful not to crack any pipework or you will need a fridge engineer for sure.
K.
Re: Name of white probe in freezer unit (Schreiber APM6855)
I am having exact same problem… and just made this post:
fridge-freezer-forum/schreiber-frost-free-fridge-freezer-apm6855-t71661.html
It seems your the guy who I linked to a forum post who gave instructions on how to change.
Did the repair last a while I am confused which part to get especially as there are 2 versions and mine is the one with the digital display? Is it just the connectors that vary?
Re: Name of white probe in freezer unit (Schreiber APM6855)
giombett wrote:Looked a bit different (not flat and with a red dot on the end) from the original, which looked just like your photo.
I am not sure which part to get and if it will even make a diference.
Re: Name of white probe in freezer unit (Schreiber APM6855)
Bob (Samurai) is the man to ask or Dave Jones as both have huge experience with these units but neither will be on until later I wouldn’t think.
K.
Re: Name of white probe in freezer unit (Schreiber APM6855)
Hi from Bob
The APM6855/0 sensor / no frost evaporator probe plugs in to a PCB
Power board on the rear of the unit behind the condenser about halfway up under a grey
Plastic coverYou have to remove the fridge freezer from the cabinet to gain access to it.
The APM6855/1 the sensor plugs in inside the freezer compartment.
Important warning you must turn off the power at the mains as the wires remain live if you only turn them off at the control panel.
You can replace the sensor by connecting it to the existing wires but not with a connector block you need straight crimp on cable connectors or you can solder the wires from the old sensor to the wires on the new sensor if you have the APM6855/0
To save you removing the fridge freezer from the cabinet.Use heat shrink to insulate the wires to stop moisture from shorting out the sensor
You can buy heat shrink from any MAPLINS
And just use a hair drier to heat it up to shrink it on to the wires.If you have the APM6855/1 then you can just plug it in.
The only difference with the no frost sensors is the plug on the end
Of the wires so if you are soldering the sensor on you can use ether one but the APM6855/0 sensor is normaly cheaper it is best if you can remove the fridge freezer on this model as it is easy to plug it in to the pcb at the back.The old type sensor fitted to the APM6855/0 was flat this was replaced by a round sensor.
It is rare for the newer type round sensor to fail but common
With the flat sensor.All new sensors are now the round type.
BobRe: Name of white probe in freezer unit (Schreiber APM6855)
Thank you for your reply Bob!
How do I know which version I have… I have the digital display model and I am pretty sure the wires for the sensor go out the back of the freezer there is no connector plug inside the freezer compartment apart from the fan.
I assumed that mine is the model 0 unit as I have a digital display on mine. So if I buy the part of white goods is the plug adapter going to even fit my model as I think the part on here is for the model 1 unit? So it looks like its going to be a case of not pulling the fridge out and just crimping the wires together some how.
I dont have tools to do that so may get the part and get someone in who is confident at doing that. Any one in the Leeds area that wouldnt charge too much?
Thank you.
Re: Name of white probe in freezer unit (Schreiber APM6855)
Both models have a digital display.
The model you have is the APM6855/0
Make sure you turn off the mains supply as the wires remain live
You can use the APM6855/1 sensor you just have to cut off the plug on the new sensor and just connect the old wires to the new sensor.
Do not use a connector block as this will change the resistance.
It is a simple job to join the wires and insulate them.
You can buy a cheap crimping tool complete with a selecton of connectors in most Pound shops.
It is best to use heat shrink to insulate the wires but you can use insulation tape.
Bob
Re: Name of white probe in freezer unit (Schreiber APM6855)
Hi Samuri
Thanks for your replies, its been about 3 weeks since I last defrosted and the fridge section temp is slowly rising from 4C to 6C. Problem is the display says that it is at 4C but my digital thermometer inside says its at 6.2C. Once I have done a full defrost digital thermometer reads at between 3&4C for a few weeks before it starts to increase again. Bread in the freezer is the first thing to start to go soft meat remains solid.
The evaporator is iced up fully and I notice it runs for longer to try to pull the temperature down. I have now bought the part http://www.ebay.co.uk/itm/140751429164? … 26_rdc{e5d1b7155a01ef1f3b9c9968eaba33524ee81600d00d4be2b4d93ac2e58cec2d}3D1 which says Manufacturers code is 502023500 which I hope will be a straight unplug & swap from the back of my freezer electrical compartment.
Kwatt further up said that its wishful thinking hoping its the sensor at fault and its normally the control pcb – surely if it works fine for a few weeks and everything is held at the correct temperature quite accuratly that says the pcb is functioning? The freezer is also at the correct temp during this time also. The temp slowly starts to increase from say 3/4C then goes upto 5C – 6C then 7C perhaps 2/3 days (as the evaporator ices up more) before each degree of temperature increase.
The only other thing it could be is the defrost heater? Hoping it isnt though as I know this cannot be replaced as its part of the evaporator. In your experience should the sensor rectify my issues based on the symptoms. Its just with what Kwatt has said about them very rarely failing… I also came across this forum post… http://www.howtomendit.com/answers.php?id=106888 which seems to suggest it is the probe that fails however a few people have said after a few weeks of replacing the sensor it is freezing up again. But works ok in those initial few weeks so if that is the case for me would it be the PCB or defrost heater?
Its obviously not worth spending £80 on a new PCB when I could possibly get a new replacement for £350… can you reccomend a suitable replacement. I would prefer frost free though.
Thank you.
Re: Name of white probe in freezer unit (Schreiber APM6855)
richardc1983 wrote:
Its obviously not worth spending £80 on a new PCB when I could possibly get a new replacement for £350… can you reccomend a suitable replacement. I would prefer frost free though.Thank you.
Hi
Sorry to say, you are not going to get a reliable well made 50:50 split integrated fridge freezer for anywhere near that figure.
To get a decent non frost free which will be more reliable you will need to look at the reputable brands like Bosch, Neff and Gorenje. If your budget won’t stretch to these then I would look at Hotpoint, Indesit and Beko.
HTH 🙂
Don
Re: Name of white probe in freezer unit (Schreiber APM6855)
don wrote:
richardc1983 wrote:
Its obviously not worth spending £80 on a new PCB when I could possibly get a new replacement for £350… can you reccomend a suitable replacement. I would prefer frost free though.
Thank you.
Hi
Sorry to say, you are not going to get a reliable well made 50:50 split integrated fridge freezer for anywhere near that figure.
To get a decent non frost free which will be more reliable you will need to look at the reputable brands like Bosch, Neff and Gorenje. If your budget won’t stretch to these then I would look at Hotpoint, Indesit and Beko.
HTH 🙂
Don
Hi Don, thanks for the reply re brands and reccomendations.
I have seen a hotpoint one for that price range that is frost free. Can you reccomend a non frost free also within that price range and I can see whats what.
Thank you
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