40
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
441
14
Information
Only-Dealer
OD Inverter
Compressor
Slowdown - High
Compressor
Current
This alert code is for more information than an issue with the system.
•
When the inverter gets close to the current or heat sink temperature limit, it will limit the ramp rate.
Instead of changing compressor speed at 1 hz/second, it changes to 5 hz/20 seconds.
• Compressor slowdown due to high compressor current.
• Compressor current is approaching limit.
• The compressor speed automatically slows.
• This error code is primarily for informational purposes as the inverter controls the compressor to
operate within design parameters. Alert code 441 typically occurs at startup as the compressor
current increases rapidly during startup.
• The inverter will reduce the compressor speed by 4 Hz and slow the compressor ramp up speed
to the requested compressor demand speed (capacity). This is normal and expected operation
of the inverter to control the inverter within design parameters. In most cases the alert code 441
notification does not require any additional service or diagnostic procedures.
•
The control sets indoor CFM and outdoor RPM to values according to demand percentage rather
than the actual Hz.
•
Possible issue is system running at high pressures.
•
Check for high pressure trips or other alert codes in thermostat and outdoor control.
•
Inverter LEDs will flash code 14.
• Refer to the unit service documentation for detailed troubleshooting procedures.
Inverter flash code 14.
The sequence is:
•
Red LED: One Flash
•
Green LED: Four Flashes
NOTE:
Inverter normal operations with no error code present is as follows. Red LED is ON and
green LED is OFF.
Automatically clears when the condition no
longer exists.
442
Service
Urgent
OD Compressor
Top Cap Switch
Strikes Lockout
The top cap switch has opened five times within one hour. As a result, the outdoor unit is locked
out
.
•
This condition occurs when compressor thermal protection sensor opens five times within one
hour.
• Outdoor unit will stop.
To clear, disconnect power to outdoor unit
and restart.
443
Service
Urgent
OD MUC Unit
Code To Inverter
Model Mismatch
The Lennox variable capacity unitary control (outdoor control) has incorrect appliance unit size
code selected.
•
Check for proper configuring under unit size code used for outdoor unit (see unit configuration
guide or in installation instructions).
• If replacing inverter, verify inverter model matches unit size.
• Remove the thermostat from the system while applying power and reprogramming.
Automatically clears after the correct match
is detected following a power reset.
444
Service
Urgent
HP Reversing
Valve Relay Or
Solenoid Fault
Relay failure. Verify by call for heat pump heating. Check for 24VAC out from
O
.
Replace Outdoor Unit Control Board
