Lennox iComfort S30 Installation And Setup Manual page 53

Initial notification of critical alerts will pop up on the home screen and will be listed under notification menu. Minor and moderate alerts are found only under the notification menu.
* Current Lennox modulating outdoor units are XC20, XP20, XC25 and XP25.
Applicable
Alert Priority
System
Code Condition
Component(s)
Heat pump,
furnace,
40 Minor
electric heat,
and iHarmony
Furnace, air
41 Moderate handler or
outdoor control
Thermostat,
furnace,
air handler,
outdoor unit,
105 Critical
equipment
interface,
PureAir S or
IHarmony
110 Critical Furnace
Table 18. Alert Codes and Troubleshooting
Actual
Displayed Alert Component or System Operational State and Troubleshooting Tip
Text
The heat pump could not increase the room temperature 0.5°F towards the set point in 30 min-
utes.
In order to use the gas furnace as a primary heating source (not defrost tempering) when the
outdoor temperature is between the high and low balance points, the heat pump:
• Must be used for a minimum of 30 minutes and the temperature in the zone not increase by
more than 0.5°F
• Has not gone into defrost in the 30 minute period.
The default for HP Heating Lockout Time default is 120 minutes and will lock the heat pump off
when the outdoor temperature is above the high balance point. Selectable range is 60 to 240
minutes.
• Go to menu > settings > advance settings > dealer control center > equipment > Smart
Hub and located HP Heating Lockout Time to verify the lockout time setting.
NOTE:
HP Heating Lockout Time is only available in a zoning system.
If any single zone satisfies the aforementioned conditions, the heat pump is stopped and the gas
HP Heating
furnace is used to satisfy all heat calls for the next duration of the parameter heat pump lockout
Lockout.
time. After the heat pump lock out is expired, the heat pump is once again used as the primary
heat source.
• Run system and verify that the heat pump cannot raise the room temperature 0.5F in 30
minutes on the zone or zones.
• Check air flow to the zones or zones.
• Check discharge air temperatures.
• Check calibration of room thermostat.
• Set the low balance point and high balance point as close together as possible. (This is 3°F
difference – Example: Set high balance point at 40°F and low balance point would set at 37°F).
Go to menu > settings > advance settings > dealer control center > equipment > Smart
Hub and located Low and High Balance Points.
• When below the low balance point, the indoor unit will heat the home between the low and high
balance point, the heat pump and furnace will heat the home. When the outdoor temperature
is above the high balance point, the gas furnace is locked out and all the heat is provided by
the heat pump.
Component
This alert code will appear anytime a component control [Furnace, air handler, air conditioner or
control has
heat pump] is replaced in the system.
been replaced.
A system component has lost communication with the system. System component (device) is
unable to communicate.
• This may indicate the existence of other active alert codes.
Communication
• In most cases errors are related to electrical noise. Verify that high voltage power is separated
Problem
from the low voltage communication wires.
• Check for incorrectly wired or loose connections between system components (devices).
• Check for a high voltage source of noise close to the system.
The component AC line voltage is too low. This alert code may appear during a brownout. It may
Low AC Line
also occur when line voltage is below its designed operating value.
Voltage
• Check and correct the power line voltage.
53
How to clear alert code
Clears when heat pump comes
out of HP Heating Lockout
Time.
Must be cleared manually.
Automatically clears when the
system detects the issue no
longer exists.
Automatically clears when the
system detects the issue no
longer exists.