System Status, Fault And Lockout Led Codes - Lennox Signature XP21 Series Installation And Service Procedure

System Status, Fault and Lockout LED
Codes
LED codes are displayed via various LEDs located on the
heat pump control (A175). See figure 19 for location of heat
pump control LEDs.
DS11 AND DS14 SYSTEM STATUS, FAULT AND
LOCKOUT LED CODES
DS11 (Green) and DS14 (Red) LEDs indicate non−commu-
nicating mode diagnostics conditions that are listed in table
11.
These LEDs display the most common fault conditions in
the system. When an abnormal condition is detected, this
function communicates the specific condition through LED
alert codes. The function is capable of detecting both me-
chanical and electrical system problems.
DS15 AND DS13 COMPRESSOR FAULT AND
LOCKOUT LED CODES
DS15 (yellow) and DS13 (red) LEDs indicate non−commu-
nicating mode diagnostics conditions that are listed in table
11.
These LEDs display fault conditions in system cooling or
heating modes, dehumidification mode, anti−short cycle
lockout, high and low pressures, discharge line tempera-
ture, outdoor temperature, and discharge sensor failures.
Table 11. System Status, Fault and Lockout LED Codes and Related icomfortt Thermostat Alert Codes
System fault and lockout LED (DS11 / DS14) alarm codes takes precedence over system status LED codes (cooling, heating stages or
defrost/dehumidification). Only the latest active LED fault or lockout alarm code if present will be displayed. If no fault or lockout codes are active, then
system status LEDs are routinely displayed. See notes 1 and 2 in table below for duration of fast / slow flashes and pause.
Heat Pump Control
icomfortt
LEDs
Thermostat
DS11
Display
DS14 Red
Green
Off Off
applicable
Simultaneous slow flash
applicable
Alternating slow flash
applicable
On On
applicable
(Outdoor Unit Codes Only)
Condition
Not
Power problem
Not
Normal operation Unit operating normally or in standby mode.
5−minute Initial power up, safety trip,
Not
anti−short cycle end of room thermostat de-
delay mand.
Not Heat pump Indicates that heat pump control has an internal component failure. Cycle 24 volt
control failure power to heat pump control. If code does not clear, replace the heat pump control.
IMPORTANT
DS15 and DS13 compressor LED fault and lockout
codes do not provide safety protection. The is a
monitoring function only and cannot control or shut down
other devices.
RESETTING FAULT AND LOCKOUT LED CODES
All LED fault and lockout codes can be reset manually or
automatically.
1. Manual Reset
Manual reset can be achieve by one of the following
methods:
S
Disconnecting R wire from the heat pump control's
R terminal.
S
Turning the indoor unit off an on again
After power up, existing code will display for 60 sec-
onds and then clear.
2. Automatic Reset
After a fault or lockout is detected, the heat pump con-
trol continues to monitor the compressor and outdoor
unit. When/if conditions return to normal, the fault or
lockout LED code is turned off automatically.
Possible Cause(s)
SYSTEM STATUS
1. No power (24V) to
heat pump control
terminal's R and C or 1
Check control transformer power (24V).
heat pump control
2
If power is available to control and LED(s) do not
failure.
light, replace the heat pump control.
2. Heat pump control
failure.
None required (Jumper FIELD TEST (E33) pins to
override)
Page 33
Solution
XP21