Samsung fridge freezer not freezing properly

[mhnewman83]

Freezer not freezing properly​

Hi everyone.
As title suggests, Samsung fridge freezer model no rsh5sbbp.

I noticed recently it's not working properly, ie lollies melting and bread softening. Seems to be even throughout the freezer.
Emptied and switched it off last night. Cleaned out inside and defrosted the pipes, and cleaned out the coils at the rear.
Checked on it this morning and there's no improvement.
The temperature on the front says -18⁰ but it clearly isn't. I did notice after turning it back on the temperature dropped from 8, 7, 6 etc but the last I noticed it was 2⁰ and then suddenly -18 in the space of 30-45 minutes.
It's also been a bit louder than normal recently, particularly the last couple of days. Humming noise.
Before I call someone out, what parts are the most likely culprits that I could try to replace myself?
Should be noted it's about 13-14 years old
Fridge side seems to be working fine.

*Edit* the compressor fan is running. The humming noise seems to be coming from the compressor. Turning it off and on (again) at the plug I can hear a clicking. Before I turned it off the temperature on the front said -18. Now I've turned it back on, the humming noise has stopped and it says -5. It was turned off for about 20 seconds.

Evaporator fan is running.

There's a red led light on the control panel on the top but I don't know if that's supposed to be there.

Thank you in advance.

 

[fourtytwo]

You said "Cleaned out inside and defrosted the pipes", does that mean the entire heat exchanger behind the rear panel in the freezer ?
How long was it off for, how much water came out, did you put a bowl of hot water in it and leave the door open ?
Sorry but it's not clear what you did, maybe my bad.

I had a similar product and it kept freezing up solid, turned out to be the defrost heater gone.

 

[mhnewman83]

No I didn't do that, I only left it to defrost until the ice visible on the pipework (I think that's what you mean by the heat exchanger behind the rear panel?) inside had melted and the the time it took me to clean and hoover out the back. Maybe an hour? I didn't do much because it's supposed to be a frost free freezer. Would leaving it longer help you think?

 

[Deleted member 307320]

Where is it? In the house, or in an unheated area?

 

[mhnewman83]

Where is it? In the house, or in an unheated area?

In the house, in the kitchen.

 

[Deleted member 307320]

In the house, in the kitchen.

What's the ambient temperature?

 

[mhnewman83]

What's the ambient temperature?

Between 18 and 20 c. Hasn't changed in the 14 years or so it's been there.

I think I may have reported your post by accident! Sorry. Pretty sure I've unreported it now.

 

[fourtytwo]

Sorry i did not realize it was some gigantic larder fridge, I don't know anything about those!