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10.0 DIAGNOSTICS AND TROUBLESHOOTING
10.2 Status and Diagnostic Codes (cont.)
Descriptions of the EcoNet
TM
2-Stage Control diagnostic codes are provided below:
Dual 7-Segment
LEDs Display
Code
Diagnostic Description
Status/Possible Cause - Trouble-
shooting Information
5L - Active Protection Protector Trip
The Outdoor Control has had a protector trip
for longer than 4 hours or has tripped 3 times
during a call for cooling.
• Check for damaged, miswired, or wrong run
capacitor
• Check for broken wires, loose connectors, or
miswired compressor
• Check compressor windings for continuity
• Check for open compressor internal protector
6 - Compressor Open Start Circuit
The Outdoor Control detects current in the Run
circuit but not in the Start circuit of the compres-
sor
• Check for damaged, miswired, or wrong run
capacitor
• Check for broken wires, loose connectors, or
miswired compressor
• Check compressor windings for continuity
6L - Active Protection Compressor Open Start
Circuit Lockout
The Outdoor Control detects loss of current in
the Run circuit three (3) times in one cooling call
• Check for damaged, miswired, or wrong run
capacitor
• Check for broken wires, loose connectors, or
miswired compressor
• Check compressor windings for continuity
• Check for compressor locked rotor
9 - Active Protection - Line Voltage Brown Out The Outdoor Control has sensed line voltage has
dropped below 175V and has shut the compres-
sor off for 5 minutes. If line voltage is above 187V
after 5 minutes, the compressor is allowed to
start.
21 - Low Pressure Control Open
The Outdoor Control detects the LPC is open.
Note: The low pressure control is ignored for
the rst 90 seconds of compressor operation
• Units has low refrigerant charge
• Indoor coil is frozen (cooling mode)
• Dirty indoor coil or lter (cooling mode)
• Indoor blower is not running (cooling mode)
• Outdoor coil is frozen (heating mode)
• Expansion valve is not operating correctly
21L - Active Protection Low Pressure Lockout LPC has opened 3 times in the same call for
cooling operation, the Outdoor Control has locked
out the compressor to protect it. Outdoor Control
alternately ashes L and 21
FLASHING
FLASHING
Diagnostics
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