Air Handler Jumpers - Lennox 16B27 Manuallines

Table 9. AHC Single Character Display — Error Codes (Communicating and Non-Communicating)
Error Codes Status of Air Handler
E 3Y8 Relay Y2 failure.
Heat call with non-configured or mis-configured electric heat. Check for proper configuring under Configuring Electric Heat Stag-
E 350
es.
E 351
Heat section / Stage 1 failed (Pilot relay contacts did not close or the relay coil in electric heat did not energize)
E 352
Heat section / Stage 2 failed.
E 353
Heat section / Stage 3 failed.
E 354 Heat section / Stage 4 failed.
E 355
Heat section / Stage 5 failed.
Error codes 401 through 409 are only displayed when the Control's L terminal is connected to a non-communicating outdoor unit's LSOM
device.
E 401
Compressor ran more than 18 hours in air conditioning mode.
E 402 Compressor system pressure trip.
E 403 Compressor short-cycling - running less than four minutes.
E 404 Compressor rotor locked.
E 405
Compressor open circuit.
E 406 Compressor open start circuit.
E 407 Compressor open run circuit.
E 408 Compressor contactor is welded.
E 409
Compressor low voltage.
Defrost cycle lasts longer than 20 minutes. Check heat pump operation. Cleared when W1 signal is removed. Applicable only in
E 420
communicating mode with non-communicating heat pump.
** Cutback Mode — The variable speed motor has pre-set speed and torque limiters to protect the motor from damage caused by operating out of
its designed parameters (0 through 0.80 in. w.g. total external static pressure).

Air Handler Jumpers

Jumpers are used for non-communicating mode only. Use
figure 2 as reference for jumper settings. If any of the ref-
erence jumpers are missing, the air handler control will
display Error code 130 and the air handler control will au-
tomatically use the factory default setting.
1. Humidification – Controls the status of H terminal on
the thermostat block. Configurations are as follows:
• If jumper is installed in SMART Humidification posi-
tion (Default), H terminal is active if heat demand is
present and indoor blower is running.
• If jumper is installed in AUTO Humidification posi-
tion, H terminal is energized whenever indoor blow-
er is running.
2. EvenHeat – Target Discharge Air Temperature
selection is used to set discharge air temperatures for
EvenHeat operation.
NOTE - Optional Discharge Air Temperature Sensor, Len-
nox Catalog # 88K38 is REQUIRED for EVENHEAT oper-
ation and must be ordered separately.
1. Blower Only CFM – Used to select Indoor blower CFM
for continuous operation.
2. Heat – Used to select Indoor blower CFM for electric
heat by placing the jumper in proper position. Actual
CFM values for different air handler sizes are shown in
Targeted CFM Tables.
3. Cool – Used to select cooling indoor blower CFM
by placing the jumper in proper position. Actual CFM
values for different air handler sizes are shown in
Targeted CFM Tables starting.
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