Lennox iComfort Wi-Fi Setup Manual page 61

Table 10. Alert Codes and Troubleshooting
Alert PRIORITY
Code CONDITION
Moderate
424
Minor
425
426 Critical
Moderate /
427
Critical
Moderate /
428
Critical
®
iComfort Wi-Fi
APPLICABLE
SYSTEM ALERT TEXT
COMPONENTS
The liquid line temperature sen­
Outdoor unit
sor has malfunctioned.
Outdoor control has increased
minimum compressor speed to
Outdoor unit
allow for proper oil return due to
low ambient temperature.
Outdoor unit Excessive inverter alarms.
The inverter has detected a DC
Outdoor unit
peak fault condition
The inverter has detected a high
Outdoor unit
main input current condition
Critical alerts are displayed on the Home screen, in the Home­
owner alert button, and in the Installer alert button. Minor and
moderate alerts are found only in the Installer alert button.
COMPONENT OR SYSTEM OPERA­
TIONAL STATE AND TROU­
BLESHOOTING TIP
•
In normal operation after outdoor
control recognizes sensors, the
alert code will be sent if a valid
temperature reading is lost.
•
Compare liquid line sensor resis­
tance to temperature / resistance
charts in unit installation instruc­
tions.
•
Replace sensor pack if neces­
sary.
•
At the beginning of (any) configu­
ration, furnace or air handler con­
trol will detect the presence of the
sensor(s).
•
If detected (reading in range), ap­
propriate feature will be set as 'in­
stalled' and shown in the iComfort
®
Wi-Fi thermostat 'About' screen.
•
Outdoor ambient temperature is
below system limit.
•
Control will attempt to run at low­
est allowed compressor speed to
allow for proper oil return.
•
After ten faults within one hour
outdoor control will lockout.
•
Inverter alarms 12 to 14 and 53
do not count towards this lockout
condition.
•
If condition (55A or higher) is de­
tected, outdoor unit will stop
(compressor and fan) – moder­
ate condition.
•
Anti-short cycle is initiated.
.
•
If peak current (55A or higher) oc­
curs 10 times within an hour, sys­
tem will lockout – critical condi­
tion.
•
If condition is detected, outdoor
unit will stop (compressor and
fan) – moderate condition.
•
Anti-short cycle is initiated.
.
•
If condition occurs 10 times within
an hour, system will lockout –
critical condition.
7-Day Programmable Communicating Thermostat
Page 61
HOW TO CLEAR
ALERT CODE
Automatically clears up­
on configuration, or
sensing normal values.
Automatically clears
when outdoor ambient
temperature rises above
limit for more than five
minutes.
To clear disconnect
power to outdoor control
and restart
To clear, disconnect and
reconnect power to out­
door control.
To clear, disconnect
power to outdoor unit
and restart.