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TROUBLE
• No Display when
touching the keys
• Low battery icon is
ON
• No Assurelink icon
displayed, or can't
control the thermo-
stat through the
smart phone App
• Filter icon is ON
• Room temperature
showing H or L
instead of digits
• Can't use the touch
keys when the home
screen is showing
• The HVAC system
stopped regulating
the temperature
with the set point
TROUBLESHOOTING
PROBABLE CAUSE
Batteries are depleted
*
For 24 VAC connected
*
thermostat, the RH/RC or C
cable may be disconnected.
Furnance turned off.
*
Battery level low
*
Can't connect to cloud server
*
RF signal can't reach the
*
thermostat
Filter life expired
*
The HVAC system may
*
turn OFF under an
extreme high or low
temperature environ-
ment.
The unit has been set to
*
Key-Lock
The mode of operation
*
is not selected according
to the season. For
example, selecting Heat
mode in summer.
SOLUTION
Replace the batteries
√
Check the connections and correct them
√
Turn the HVAC system back on.
√
√
Replace the batteries
Check the Gateway Ethernet connection
√
Check the availability of Internet access
√
Move the Gateway closer to the thermostat
√
√
Change filter then reset the filter counter.
Refer to the Filter section under
Feature/Operation.
√
Turn ON the HVAC system with the thermostat
and wait for about 15-30 minutes; it should
display the room temperature again. If the
environment temperature is not normal, call for
service for your HVAC system.
To release the Key-Lock, press Up and Down
√
together for about 2-3 seconds. To activate
the Key-Lock, press Up and Down together
for about 2-3 seconds.
Manually change the operating mode by
√
pressing System button. You can also select
Auto so the thermostat will determine for you
the mode of operation automatically.
P 10
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