Hello, Which filter do I need with this model : samsung model RF32FMQDBSR/AA ?

if its just one section that is not freezing I would check ur thermistors. and cold control thermostat unless its an adc unit in which case you check the main control board

I've had to install filter in horizontal position to avoid clogging of filler outlet by carbon sediment..

Hello, Helen -

You do not state the make of your refrigerator. I did find information on a Samsung refrigerator with the model number you have given.

However, I do not find any information regarding a user manual for a Samsung refrigerator with that number.

Without knowing the make of your refrigerator, for sure, I can only refer you to ManualsOnline in hopes you can find the right downloadable (PDF format) manual for your refrigerator.

If you add more information providing the maker name of your refrigerator, I or someone else may be able to find the right manual for you.

Hello Gary Traver,

Page 13 of the USA model... (similar)
shows the steps to follow to RESET the water
after a FILTER CHANGE...

by... Pressing the "FRIG" & "POWER Cool" buttons
simultaneously for 3 seconds.

It is also possible the water line was kinked or the water turned of...

The instructions say t turn off the WATER before
starting the process (I would rather not move
the refrigerator... so that step always gets SKIPPIED)...

(sometimes high pressure makes it difficult to get the
filter BACK IN... and the solution is to SHUT the water
supply off... (ergo the need to check that).

Not seen in these instructions...

running the water through the new filter... (to clarify)..

((my water looks pretty yucky coming out of a new filter.

5 seconds... 5 second... (intervals... for 2 minutes)..

May be... the USA instructions I found here are
CLOSE ENOUGH )...
http://www.searspartsdirect.com/partsdirect/user-manuals/rf260beaespaa0001-samsung-parts-manual?manualIndex=0

Hope it helps...
Carnac the Magnificent

Go to searspartsdirect.com with your model number. You can find parts lists and diagrams there