28
Table 2. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), PA=Pure Air S, ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual Displayed
Alert Text
Under dealer
control center >
Notifications
Component or System Operational State and Troubleshooting Tip
How to clear alert code
416
Service Soon
OD Coil Sensor
Faulty
The outdoor coil sensor is either open, short-circuited or the temperature is out of sensor range.
• Outdoor unit control will not perform demand or time / temperature defrost operation. (System
will still heat or cool.)
•
This fault is detected by allowing the unit to run for 90 seconds before checking sensor resistance.
If the sensor resistance is not within range after 90 seconds, the control will display a moderate
code.
• Advances from moderate to critical after ten (10) minutes.
•
Plug-in sensor harness correctly.
•
Check resistance of sensor to determine if it is open, shorted, out of temperature calibration or
out of ambient temperature range. Replace if out-of-specifications.
Automatically clears when outdoor unit
control detects proper sensor readings.
If sensor is faulty and the system is report-
ing the condition as critical, replaced sensor.
Reset power to clear alert code.
417
Service Soon
OD Discharge
Sensor Faulty
System Detection and Operation:
The outdoor unit
discharge line
temperature sensor is either open, short-circuited or the
temperature is out of sensor range.
•
This fault is detected by allowing the unit to run for 90 seconds before checking discharge line
sensor resistance.
• If the discharge sensor resistance is not within range after 90 second period, the control will
display the priority condition as
service soon
.
• If the moderate condition continues for 10 minutes, the system changes the priority condition to
service urgent
.
Possible Causes:
• The applicable system component detects either an open, shorted or temperature out of range
condition.
•
Discharge sensor leads located in wrong pin positions in harness plug-in connector. Refer to the
applicable unit installation and service procedure and locate the terminal descriptions table to
verify cable harness assembly wiring pin positions are correct.
Possible Solutions:
•
Check the resistance of the discharge sensor and compare to temperature resistance chart
located in the applicable unit installation and service procedure. If sensor resistance is out of
range then replace the discharge line temperature sensor.
• If discharge sensor wring leads are located in the wrong connector pin-out then order a
replacement cable assembly.
Moderate
- Automatically clears after fault
signal condition is no longer present.
Critical
- Power down the system com
-
ponent and either replace faulty sensor or
cable assembly (whichever is applicable).
Power up system component after replacing
the applicable part which will clear the alert
code / priority condition.
418
Service Soon
OD EIM
W Output
Hardware Fault
There is a faulty
W
output circuit.
•
W
terminal is energized while in cooling mode.
•
Possible cause may be a stuck closed relay on the control, or something external to the control
that is energizing
W
terminal when it should not be energized.
•
Disconnect any wiring from the
W
terminal.
•
If 24VAC is still present on the terminal, then it is a stuck relay.
•
If 24VAC disappears, then there is a need to check any of the wires hooked up to the
W
terminal.
Automatically clears after fault signal is
removed.
