Hardwire 16 swap (QS7121-840 to qs7133-840)

Support
#1

I have an older QS7121-840 hardwire unit that has acted up intermittently ever since it was installed (a little over five years). The main problem being the panel would report open windows when they weren’t open (windows connected to the hardwire). Twice in five years it happened when we were either not home or in the middle of the night when the panel was in arm stay. Well, it happened last week and it woke up the entire fam. I now want to replace the hardwire unit with its younger brother, the QS7133-840.

I wanted to see if there are any tips for switching the hardwires where I didn’t have to reprogram everything. Thanks in advance!

#2

Swapping hardwire 16s will require reprogramming of zones.

However, you can use the new resistors that come with the hardwire package and the default resistance mode which can make the installation a little easier and less prone to issues. This makes it so you do not individually learn resistances like with the original IQ Hardwire 16, they all just use an expected standard resistance.

Alternatively you can use EOL Learn mode to pair everything the same way as before with existing resistors.

#3

Thank you for confirming Jason. I’ll keep the default resistor option in mind, at the moment it’ll be more work but might be worth it.

Would I remove all current hardwire zones from the panel first, then remove the hardwire from the panel, then relearn?

#4

Would I remove all current hardwire zones from the panel first, then remove the hardwire from the panel, then relearn?

Yep, that will work.

#5

Thanks again Jason - got the unit swapped and ended up using the new resistors.