iComfort Wi-Fi
®
7-Day Programmable Communicating Thermostat
Page 61
Table 10. Alert Codes and Troubleshooting
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.
Alert
Code
PRIORITY
CONDITION
APPLICABLE
SYSTEM
COMPONENTS
ALERT TEXT
COMPONENT OR SYSTEM OPERA
TIONAL STATE AND TROU
BLESHOOTING TIP
HOW TO CLEAR
ALERT CODE
424
Moderate
Outdoor unit
The liquid line temperature sen
sor has malfunctioned.
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.
Automatically clears up
on configuration, or
sensing normal values.
425
Minor
Outdoor unit
Outdoor control has increased
minimum compressor speed to
allow for proper oil return due to
low ambient temperature.
Outdoor ambient temperature is
below system limit.
Control will attempt to run at low
est allowed compressor speed to
allow for proper oil return.
Automatically clears
when outdoor ambient
temperature rises above
limit for more than five
minutes.
426
Critical
Outdoor unit
Excessive inverter alarms.
After ten faults within one hour
outdoor control will lockout.
Inverter alarms 12 to 14 and 53
do not count towards this lockout
condition.
To clear disconnect
power to outdoor control
and restart
427
Moderate /
Critical
Outdoor unit
The inverter has detected a DC
peak fault 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.
To clear, disconnect and
reconnect power to out
door control.
428
Moderate /
Critical
Outdoor unit
The inverter has detected a high
main input current condition.
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.
To clear, disconnect
power to outdoor unit
and restart.
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