Lennox iHarmony Zone Thermostat User Manual

13
Table 4. Alert Codes
Error
Code
Message
Type
Condition and
Email Notication
Description
Thermostat Display
Text
System Action
Action to Clear /
Recovery Condition
551 Critical Lost communication
Problem (Zoning
Control)
A pop-up display will
appear indicating
communication
error.
Indoor temp is
displayed as “--” on
the home screen.
inside
0
1
When any zone
sensor loses
communication with
the damper control
module, the entire
system will go into
central mode.
Once communication is
reestablished the device
will return to normal zone
operations.
Any lost communication
between the zone sensor
and damper control module
will result in the applicable
error code being displayed
542, 543, 544 or 545 at the
thermostat.
Check wiring between
damper control module and
the zone sensor reporting
error code 551.

Lennox iHarmony Zone Thermostat Specifications

General

Brand	Lennox
Model	iHarmony Zone Thermostat
Category	Thermostat
Language	English