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Table 4. Alert Codes
Error
Code
Message
Type
Condition and
Email Notification
Description
Thermostat Display
Text
System Action
Action to Clear /
Recovery Condition
542
Critical
Temperature Sensor
Error
Problem (Zoning
Control)
System will go into
central mode
If problem is due to
temperature sensor issue,
then zone sensor will need to
be replace.
543
Temperature Sensor
Error
Problem (Zoning
Control)
544
Temperature Sensor
Error
Problem (Zoning
Control)
545
Temperature Sensor
Error
Problem (Zoning
Control)
546
Critical
EEPROM error
(Power ON)
Memory error
System will set
itself to energy save
mode and continue
to operate.
Zone sensor will have to be
replaced..
547
Critical
EEPROM error
(Operating)
Memory error
System will operate
in normal mode
operation until
power off.
Zone sensor will have to be
replaced.
548
Critical
Hum sensor error
(Without Humidifier
or Dehumidifier):
sensor reads out of
range 0% to 100%
Humidity sensor
error
This message
indicates humidity
sensor has
malfunction.
Zone sensor will need to be
replaced or if sensor auto
corrects itself the alert will
be automatically cleared and
system will return to normal
operation.
Summary of Contents for iHarmony Zone Thermostat
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