79
Table 19. 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
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
component 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.
419
Service
Urgent
OD EIM
W Output
Hardware Fault
Lockout
The
W
output has reported more than five errors.
• The system will shut down the outdoor unit.
• The
W
output (alert code 418) on the outdoor unit has reported more than five strikes.
• Disconnect thermostat wire from
W
and verify there is no 24VAC on the
W
.
• If 24VAC is present, replace the outdoor control.
Automatically clears after power
recycled.
