Lennox Harmony III Installation Instructions

TROUBLESHOOTING
Page 54
505023M 08/11
TROUBLESHOOTING
Operation & Troubleshooting Indicators
Zone Control Panel LEDs
The zone control system operation is indicated by light emitting diodes (LEDs) located on the zone control panel. In addition
to operating condition, the LEDs provide valuable information system troubleshooting. The LEDs (shown in figure 29) are
thermostat, diagnostic, and output status.
1. Thermostat LEDslocated along the upper edge of the zone control panel. Each zone has three LEDs to indicate a
call for heating or cooling: green (indicates a Y / compressor demand), red (indicates a W / heating demand) and amber
(indicates a G / indoor blower demand). These LEDs are labeled according to the zone and demand.
2. Diagnostic LEDsDiags 1, 2, 3, 4located near the bottom center of the the zone control panel. These LEDs aid the
technician in troubleshooting problems. When an error is detected, LEDs illuminate in a pattern. See Fault Recall and
Time Delay Override on page 55.
3. Output LEDslocated along the bottom of the zone control panel and near connection terminals. These red LEDs indi-
cate the output status of dampers, furnace, outdoor unit, etc. When an output is powered or active, the corresponding
LED is illuminated.
4. Pressure Switch LEDLocated at the top left corner. Green LED illuminates when the heat pump pressure switch is
closed indicated normal pressures. The LED will be off when the pressure switch opens under abnormal or excessive
condensing pressure in the heat pump heating mode. Pressure switch is used only on heat pump systems.
5. Balance Point Sensor LEDLocated at the top left corner. Red LED illuminates when the balance point sensor is
closed indicating outdoor temperature is below the balance point sensor setting. Only used on dual fuel heat pump sys-
tems.
The LEDs are labeled according to output and function. For example, if Damper 1 LED is illuminated, it’s damper has
been signaled to close; when the LED is extinguished, it’s damper has been signaled to open, allowing air flow to that
zone.
THERMOSTAT
LEDs
OUTPUT STATUS LEDs
DIAGNOSTIC
LEDs
TIME DELAY
OVERRIDE
FAULT
RECALL
EQUIPMENT
OUTPUT LEDs
OUTDOOR THERMOSTAT /
BALANCE POINT LED
PRESSURE
SWITCH LED
Figure 29. System Indicators/Troubleshooting Devices

Lennox Harmony III Specifications

General

Brand	Lennox
Model	Harmony III
Category	Control Systems
Language	English