Lennox iComfort S30 Installation And Setup Manual page 46

Table 1. Alert Codes and Troubleshooting
Applicable
Alert Priority
System
Code Condition
Components
439 Moderate Outdoor unit
440 Moderate Outdoor unit
441 Moderate Outdoor unit
442 Critical Outdoor unit
443 Critical Outdoor unit
Moderate / IHarmony Damper
530
control module
Critical
IHarmony Damper
532 Moderate
control module
Critical alerts are displayed on the Home 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 Text Component or System Operational State and Troubleshooting Tip
" Input current is approaching a high limit.
" Compressor speed will automatically slow down. The outdoor control will continue
Compressor slowdown
sending the inverter speed demanded by the thermostat.
due to high input current.
" The outdoor control will set indoor CFM and outdoor RPM to values according to
demand percentage rather than the actual Hz.
" Heat sink temperature is approaching limit.
" The compressor speed automatically slows to reduce heat sink temperature.
" The control sets indoor CFM and outdoor RPM to values according to demand per­
centage rather than the actual Hz.
Compressor slowdown
" Feedback from supplier tear down of inverter indicates that the screws that hold the
due to high heat sink
temperature.
inverter to the inverter board were loose causing poor contact between these two
components.
" Tighten screws that hold the heat sink to the inverter control board.
NOTE: Wait five minutes for all capacitors to discharge before checking screws.
" Compressor slowdown due to high compressor current.
" Compressor current is approaching limit.
" The compressor speed automatically slows.
Compressor slowdown
" The control sets indoor CFM and outdoor RPM to values according to demand per­
due to high compressor
centage rather than the actual Hz.
current.
" Possible issue is system running at high pressures.
" Check for high pressure trips or other alert codes in iComfort
trol.
The top cap switch has
" This condition occurs when compressor thermal protection sensor opens five times
opened five times within
within one hour.
one hour. As a result,
" Outdoor unit will stop.
the outdoor unit is
.
locked out
" Check for proper configuring under unit size code used for outdoor unit (see unit
configuration guide or in installation instructions).
Incorrect appliance unit
" If replacing inverter, verify inverter model matches unit size.
size code selected.
" Remove the thermostat from the system while applying power and reprogramming.
" Damper supply voltage is less than 18VAC.
Low Damper 24VAC
" Maintain non-zone mode for five minutes after alarm clears.
Voltage
" Compressor pressure is above the specified limit.
Zoning Pressure Switch
" Compressor is turned off.
Opened (high pressure)
" Zoning will be restored once the high pressure switch closes.
®
S30 and outdoor con­
46
How to clear alert code
Automatically clears when the
condition no longer exists.
Automatically clears when the
condition no longer exists.
Automatically clears when the
condition no longer exists.
To clear, disconnect power to out­
door unit and restart.
Automatically clears after the cor­
rect match is detected following a
power reset.
Automatically clears when the
condition no longer exists.
Automatically clears after com­
pressor pressure is within limits.