Lennox icomfort Wi-Fi, Installer'S System Setup Manual

iComfort

Wi‐Fi

®

 7-Day Programmable Communicating Thermostat

33

Table 1. Alert Codes and Troubleshooting

Critical alerts are displayed on Home (user) screen, in the Homeowner alert button, and in
the Installer alert button. Minor and Moderate alerts are found only in the Installer alert
button.

Alert

Code

Steps to clear

Alert Text

Priority

431

Moderate /

Critical

The inverter has detected a PFC circuit
over­current condition

.

Error occurs when PFC detects a over current condition of 100A peak. If condition is de­
tected, outdoor unit will stop (compressor and fan). Anti­short cycle is initiated. If condition
occurs 10 times within an hour, system will lockout. To clear, disconnect power to outdoor
unit and restart.

432

Moderate /

Critical

The inverter has detected a DC link high
voltage condition.

Error occurs when the DC link capacitor voltage is greater than 480VDC. If condition is
detected, outdoor unit will stop (compressor and fan). Anti­short cycle is initiated. If condi­
tion occurs 10 times within an hour, system will lockout. System will stop. To clear, discon­
nect power to outdoor unit and restart.

433

Moderate /

Critical

Compressor phase current is too high.

Error occurs when compressor peak phase current is greater than 28A. Inverter will issue
code 14 first and slow down to try to reduce the current. If the current remains high, out­
door unit will stop (compressor and fan). Anti­short cycle is initiated. If condition occurs 5
times within an hour, system will lockout. To clear disconnect power to outdoor unit and
restart.

434

Moderate /

Critical

Outdoor control has lost communications
with the inverter for greater than 3 minutes.

This error will occur when communication check­sum error occurs for 3 minutes. Outdoor
control will stop all compressor demands, recycle power to the inverter by de­energizing
the contactor for 2 minutes.

435

Moderate /

Critical

Inverter internal error.

When this error occurs, the outdoor control will cycle power to the inverter by opening the
contactor for 2 minutes. Outdoor control will cycle power to the inverter 3 times and then
outdoor unit is locked out

.

436

Moderate /

Critical

Inverter heat sink temperature exceeded
limit

.

This occurs when the heat sink temperature exceeds the inverter limit. Inverter will issue
code 13 first and slow down to try to cool the heat since. If temperature remains high,
outdoor unit will stop (compressor and fan). Anti­short cycle is initiated. If condition occurs
5 times within an hour, system will lockout. System will stop. To clear, disconnect power to
outdoor unit and restart.

437

Moderate /

Critical

Heat sink temperature sensor fault has oc­
curred (temperature less than 4 ºF or great­
er than 264ºF after 10 minutes of operation)

.

This occurs when the temperature sensor detects a temperature less than 0.4ºF or great­
er than 264ºF after 10 minutes of operation. If condition is detected, outdoor unit will stop
(compressor and fan). Anti­short cycle is initiated. If condition occurs 5 times within an
hour, system will lockout. To clear disconnect power to outdoor unit and restart.

438

Moderate /

Critical

The inverter has detected a PFC circuit
over­current condition

.

Error occurs when PFC detects an input over current condition of 35A peak. If condition is
detected, outdoor unit will stop (compressor and fan). Anti­short cycle is initiated. If condi­
tion occurs 10 times within an hour, system will lockout. To clear, disconnect power to
outdoor unit and restart.