Yolink YS7903-UC User manual

Water Leak Sensor
YS7903-UC, YS7903-EC
User Guide
Rev 1.1

Sincerely,
Queenie, Clair, James, Eric
Customer Support Team
Thank you for purchasing YoLink products and for entrusng us with your smart home needs!
Your 100% sasfacon is our goal. If you experience any problems with seng up your new
YoLink Water Leak Sensor, please give us a chance to assist you, before returning your
purchase.
We at Customer Support are here for you.If you need any assistance installing , seng up or
using a YoLink product or our app.
Find addional support and ways to reach us at:
www.yosmart.com/support-and-service
Or scan this QR code with your smartphone
Email us, 24/7 at:
[e-mail]
Call us, 9AM to 5PM Pacific Standard Time at:
[phone]
You may chat with us on Facebook (non-urgent maers):
www.facebook.com/YoLinkbyYoSmart

Contents
A.
B .
C .
D.
E .
F .
G.
H.
I .
J .
In the Box ······· ····· · ·· · ··1······················ ····· ···················································· · ·
·Introducon ······························································································ 2
Set Up ····································································································· · 4· ·
Using the YoLink App ················································································ 8···
YoLink Control ···························································································14
Maintenance ······················································································· ····18·
Specificaons ····················································································· ·····21·
Troubleshoong ················································································· ·····23·
Warning ······························································································ ····24·
Customer Service & Warranty ······························································· ····26·
Revised: 05/08/2021
Copyright 2021 YoSmart Inc. All rights reserved©

1
A. In the Box
A. Water Leak Sensor
B. Quick Start Guide
A.
B.

B. Introducon
The Water Leak Sensor is a water detector, and can provide you with an early warning of water
leaks or flooding before major damage occurs. Water between any one of the three pairs of
probes (see illustraon) triggers an immediate response from the sensor. Upon the detecon
of water, the sensor LED will blink red, and noficaons will be sent to you via the YoLink app.
(Available noficaon types are: email, text/SMS and banner noficaons on your Apple or
Android smartphone, each configurable in app sengs.)
2
SET Buon
Probe
1
2
3
Status LED
- Not Visible While
there is no operaon
with the SET buon
Alert LED
- Not Visible While
device is in normal
monitoring status

The LED light indicates the current status of the sensor:
3
Status LED
Blinking Red Once, then Green Once
Device turned on
Blinking Green
Connecng to Cloud
Slow Blinking Green
Updang
Blinking Red And Green Alternately
Restoring to Factory Defaults
Fast Blinking Green
Establishing Connecon with YoLink System (YoLink Control)
Fast Blinking Red
Removing Connecon to YoLink System (YoLink Control)
Blinking Red Once
Device is connected to the cloud and is funconing normally
Fast Red Every 30 Seconds Blinking
Baeries are low; please replace the baeries (see page 19 & 20)
Alert LED
Blinking Red Every 5 Seconds
Leak or Flooding Warning

C. Set Up
C-1. Set Up - First-Time YoLink Users (Exisng users proceed to C-2. Add Device, next page)
T h e Yo Li nk H ub i s re qu i re d
to set up yo u r Wa te r L e a k
S e n so r. P le a s e s et u p y ou r
Yo Li n k H u b fi rst ( refer t o
Yo Li n k H ub m an ua l )
3
Power
Adapter
YoLink Hub
Log in to the YoLink app
2
Create a new account if
required
YS1603-UC
User Guide
2. Ethernet patch cable (included) to
your network (router, switch, etc.),
recommended. Otherwise connect
your Hub to your home 2.4 GHz Wi-Fi
network (only when necessary).
Refer to the Hub set up manual for
more informaon:
1. Make sure your Hub is connected
to the internet (green LED indicator is
blinking, blue LED indicator is always
on)
Download the YoLink app through
Apple App Store or Google Play
Store (Search in the store or use
the QR code on the right)
1
Apple iPhone or tablet that is iOS 9.0
or higher, or an Android phone or
tablet that is Android 4.4 or higher
4

5
C-2. Add Device
1. You will need to press the SET buon once again if the device failed to connect to the cloud
2. Pressing the SET buon at any other me aer this inial process will result in the LED blinking
red once, only. This indicates the device is connected to the cloud and is funconing normally
3. If the red LED does NOT blink as noted this may indicate a problem with the sensor. Please see
the troubleshoong secon and the contact secon for technical support
Press the SET buon once to turn
on the device. The Status LED will
blink red once, then green several
mes, indicang your device has
connected to the cloud and is
ready to use
2
You must press “Bind Device” to
pair the device to your account
Ta p “ ” i co n , t h e n s c a n Q R
C o d e o n t h e d e v i c e . F o ll o w t h e
s t e p s t o a d d t h e d e v i c e
1
SET Buon

6
Place the Water Leak Sensor where a leak or flooding may occur
C-3. Sensor Placement
Suggested Addional Applicaons:
Basement Floors
Under Laundry Machines
Under Dishwashers
Under Refrigerators (w/Ice Machines)
Near Sump Pumps
Under Fish Tanks/Aquariums
Inside Hot Tubs*
Locaons Subject to Freezing Pipes*
Please refer to device environmental
operang range informaon on page
21. Use this device outside the
recommended ranges at your own
risk

7
D. Using the YoLink App
D-1. Device Page
Connecon Status
of and HubWater Leak Sensor
Baery Level
of Water Leak Sensor
Shown red if baery level is low-
Details
- Tap to go to Details page(refer to page 8 & 9)
- Tap to get device manual link, feedback, contact us informaon, etc.
Alert Interval
- Set re-noficaon interval
aer a leak or flooding warning
Default is 5 minutes
Device Alert History
Water detected and cleared
events, logged with date & me
Real-me Status of Water Leak Sensor:
Normal or water-detected

D-2. Details Page
8
Aer changing “Alert Interval” sengs, press the device’s SET buon once, to sync the new sengs to the
device. Otherwise, the device will automacally update within 4 hours (maximum)
f. Alert Sengs
- Enable or disable alerts
a. Device Type
c. Choose a Room for device
e. Device Alert History
Water detected and cleared events, logged
with date & me
b. Rename the Device
d. Add/Remove from favorites
i. Device Model
g. Alert Interval
- Set re-noficaon interval aer a leak or
flooding warning
Default is 5 minutes
h. Real-me Status:
Normal or water-detected
- Tap to get device manual link, feedback, contact us informaon, etc.

j. Device EUI (unique)
k. Device SN (unique)
l. Connecon Status of sensor and Hub
n. Current Baery Level
Shown red if baery level is low-
o. Firmware Version
- “#### ready now (refer to page 17)” indicates a new update is available
p. Remove Device From Current Account
Tap to delete the device from your YoLink account-
m. Temperature Value
- Updates when:
1. SET buon pressed
2. On a device alert
3. Baeries are replaced
4. Automacally within 4 hours maximum
9

D-3. Device Alerts
When any set of probes are touched by water at the same me, an alert noficaon will be
sent, and the sensor status will be shown on your YoLink app (see page 2 for more informaon
about noficaons)
The default re-noficaon interval aer
a leak or flooding alert is 5 minutes. This
interval may be adjusted in the Details
page (refer to page 8 & 9)
Floor
Probe
Water detected
(Water depth >0.01 inch)
10

E-4. Automaon
Water Leak Sensor can be set as a trigger only, with two trigger opons: Water Detected; No Water
Detected (Water Cleared)
a. Tap the “+” icon to add
an automaon
b. Add an automaon
b-1 Edit name
b-2 Edit trigger
b-3 Edit behavior (You must have at least one acon
device, or you cannot set a behavior)
b-4 Edit when (Set a me range for the automaon:
always or during specific days or mes)
b-5 Tap to save the sengs
1. Tap “ ” buon to enable or disable the
automaon
2. Swipe le to view the history logs and to edit or
delete the automaon
c. Click to edit the automaon
a.
Go to the “Smart” screen, tap “Automaon”
b-1
b-2
b-3
b-5
b-4
Swipe Le
c.
11

E-5. Third-party Assistants
Go to Sengs > Voice Assistants for the applicable voice assistant integraon guide
Tap “ ” in the upper le corner to go to My Profile
C o n n e c t Yo L i n k w it h t h ir d - p a r t y v o i c e a s s i s t a n t s t o m o n i t o r t h e s t a t u s o f y o u r d e v i c e s
t h ro u g h v o i c e c o m m a n d s
1. The Water Leak Sensor integrates with Alexa and IFTTT.com
2. Monitor the Water detected (closed)/No water detected (open)
status of the Water Leak Sensor from the Alexa app
3. Water detected/Water cleared status can be queried by voice
command as well as the Alexa app (For example, “Alexa, what
is the status of the Basement Water Leak Sensor? ” -- “No water is
detected of the Basement Water Leak Sensor ”
4. The Water Leak Sensor may be used as a trigger or input for Alexa
rounes and for custom applets (IFT T T.com)
5. For addional informaon specific to the plaorm, refer to the
associated app. Visit our website at
www.yosmart.com/support-and-service for addional informaon,
or contact us via email or phone (see page 25 for Customer Support
email address and phone number) informaon
12

E. About YoLink Control
YoLink Control is our unique device-to-device control technology. Using YoLink Control, YoLink
devices can be controlled without the Hub or an internet connecon. (Use of YoLink Control is
oponal; you can use the Automaon feature in the app OR use YoLink Control, but YoLink
Control offers the benefit of operaon without the Hub or internet connecon.)
One device controls another, directly. A device that sends out commands is called the controller. A
device that receives the commands is called the responder. Examples of a controller are a Water
Leak Sensor, while examples of a responder are a Siren or a Gas/Water Valve (Controller)
The Water Leak Sensor can only work as the controller of YoLink Control
E-1. Pairing
To co nfi gure yo u r Wate r L e ak
Sensor as a controller, Press and
h o l d t h e S E T b u  on fo r 5 - 10
seco n ds u n l t h e L E D q u ick l y
blinks green, then , release the
buon
1
a. SET Buon
(5-10 seconds)
13

To configure a Gas/Water Valve
C o ,n t ro l l e r a s t h e r e s p o n d e r
close the valve using SET buon
o r v i a Yo L i nk a pp ( ve ri f y t h e
valve is shown to be Closed on
the app). Press and hold the SET
buon for 5-10 seconds unl the
LED quickly blinks green, then,
release the buon
2
Upon pairing, the LED will stop
blinking (this may happen aer
only blinking two or three mes)
3
b. Press to
close the valve
c. SET Buon
(5-10 seconds)
Refer to the Gas/Water Valve
Controller manual for more
informaon:
YS4909-UC
Gas/Water
Valve Controller
Hold the SET buon longer than 10 seconds will ABORT the pairing operaon
14

Floor
Probe
Water Leak Sensor
Water detected
(Water depth >0.01 inch)
Operaon
ClosedOpened
Water Pipe
W h e n t h e Wa t e r L e a k S e n s o r
d e t e c t s w a t e r , t h e Y o L i n k
Gas/Water Valve Controller will
now immediately close the valve.
The valve will remain closed unl
opened via the app or using the
SET buon; the restoral of the
Water Leak Sensor to normal (no
water detected) does not open
the valve
More advanced sequences,
controlling mulple outputs
(e.g. close valve and
acvate siren) are
available via the
YoLink app
15

E-2. Unpairing
A t t h e W a t e r L e a k S e n s o r
(controller), press and hold the
SET buon for 10-15 seconds unl
the LED quickly blinks green, then
red, then, release the buon
1
At the Gas/Water Valve Controller
(responder), press and hold the
SET buon for 10-15 seconds, unl
the LED quickly blinks green, then
red, then, release the buon
2
U p o n u n - p a i r i n g , e i t h e r t h e
Wate r L e ak Sen s or L ED o r t h e
Gas/ Wate r Val ve C o ntrolle r L ED
will sto p blink i n g and tur n off
3
The Gas / Water Valve Contro ll e r
will no lo n ger re s po nd to th e
Wate r L ea k S en so r
4
a. SET Buon
(10-15 seconds)
Hold the SET buon longer than 15 seconds will
ABORT the unpairing operaon
b. SET Buon
(10-15 seconds)
16

To ensure our customers have the best user experience,
we highly recommend you update to the newest version
firmware when an update is available
The device’s firmware will be updated
a u t o m a  c a l l y w i t h i n 4 h o u r s
(maximum). To force an immediate
update, press the SET buon on the
device once to make the device enter
update mode
You may use your device during the
update as it is performed in the
b a c k g ro u nd . T h e L ED l ig ht wi l l
s l o w l y b l i n k g r e e n d u r i n g t h e
up d ate and the process will be
complete within 2 minutes aer the
light stops blinking
In “Firmware”, if a new version is listed as available (####
ready now), click it to start the firmware update process
F. Maintenance
F-1. Firmware Update
17