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Table 19. Alert Codes and Troubleshooting
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. Moderate alerts
are not e-mailed to Homeowners. Dealers will get an email and code can be seen on thermostat under the installer notification section.
NOTE:
Anytime the word
DEVICE
or
DEVICE2
is used in this table, it will be replaced on all alert code notification screens with the actual offending device name, for example, thermostat, heat
pump, etc.).
Alert
Code
Inverter
Flash
Code
Priority
Condition
Applicable
Component
Actual Displayed
Alert Text
Component or System Operational State and Troubleshooting Tip
382
Moderate
Equipment
interface
module
Relay W1 Failure Relay
W1
failure (furnace or air handler modes only).
W1
relay is energized but input is not sensed after three seconds.
Automatically clears when W1 relay input is sensed.
400
Critical
Outdoor unit
Compressor
Internal Overload
Tripped
The compressor internal overload has tripped.
• Thermostat demand
Y1
is present; however compressor is not running.
• Check power to unit.
• This alert code is automatically cleared after current is sensed in both RUN and START sensors for at least two seconds or
after service is removed, or after power reset.
401
Moderate
Outdoor unit Compressor Long
Run Cycle
Either the compressor ran for more than 18 hours continuously while attempting to cool the home during a single demand or the
system refrigerant pressure is low.
• Alert code will not lockout system.
•
If the two-stage outdoor unit has an outdoor control with flashing LED lights then the unit will run in low speed;
•
An outdoor control with a seven-segment display, the outdoor control will display alert code 401, but continue to run in high
speed.
• If the outdoor unit is a heat pump, and the outdoor temperature is less than 65°F, alert code 401 is ignored.
• Also monitors low pressure switch trips.
Automatically clears after 30 consecutive normal run cycles or power reset.
402
Critical
Outdoor unit
Outdoor Unit
System Pressure
Trip
•
Either the discharge or suction pressure level is out-of-limits, or the compressor has overloaded.
• Check discharge or suction pressure.
Automatically clears after four consecutive normal compressor run cycles.
403
Moderate
Outdoor unit Compressor Short-
Cycling
The compressor ran for less than three minutes to satisfy a thermostat demand. Automatically clears after four consecutive
normal compressor run cycles.
404
Critical
Outdoor unit Compressor Rotor
Locked
The compressor rotor is locked up due to either:
• Run capacitor short.
• Bearings are seized.
•
Excessive liquid refrigerant.
NOTE:
May need to install hard start kit.
Automatically clears after four consecutive normal run cycles or after power reset.
405
Critical
Outdoor Unit Compressor Open
Circuit
The compressor circuit is open due to:
• Power disconnection -
• Open fuse
Automatically clears after one normal compressor run cycle.
