12
LT-2026
EN
6. Alerts and Device Faults
A. Alerts Visible to Patients
Alert
Description
Delay running
XX minutes left
Comfort Delay is active
Mask off. Please check
mask
fi
t.
High airfl ow during use
(Poor mask fi t or mask
removed)
Device Fault E0X. Call
provider.
Device error (See next table.)
B. Device Faults Visible to Patients
Only device faults classifi ed as critical are visible to the patient
on the LCD display.
These faults can be corrected by a service technician.
Device
Fault
Description
E01
Read Setting Error.
Stored prescription set-
tings are corrupted. Unit is in fail-safe state
(blower off) when this error displays. See
Troubleshooting and Service Instructions to
correct fault, or return unit for repair.
E03
Motor Error.
Unit attempts to drive the mo-
tor, but the blower is not spinning (zero motor
speed). See Troubleshooting and Service
Instructions to correct fault, or return unit for
repair.
E04
Locked Rotor Error.
Average motor speed is
low, while the motor current is high, for several
seconds. See Troubleshooting and Service
Instructions to correct fault, or return unit for
repair.
E07
Motor Fault Error.
The motor control chip fault
output goes active low for a fi xed period of
time. See Troubleshooting and Service Instruc-
tions to correct fault, or return unit for repair.
C. Reading and Clearing the Last Device
Fault Code
NOTE
– The last device fault code is stored in EEPROM to assist
in fi eld service of the unit.
Additional equipment: IBM or Compatible PC with a free serial
port, PAP to PC cable (DV54/DV53D-615), a terminal program
(Microsoft Windows HyperTerminal or equivalent).
1. Connect the DV54/DV53 PAP to the PC serial port with
PAP to PC cable.
2. Apply AC power to the unit. If the blower is running, press
the ON/OFF key on the keypad so that the blower stops
and the LCD displays
‘OFF
’.
3. Use a terminal program (such as Windows HyperTerminal,
or equivalent) with COM settings 9600 baud, no parity, 8
data bits, 1 stop bit, and Flow Control set to none.
4. When connection is established with the PAP, the terminal
program will show: ‘
RI
;’ every 0.5 seconds. This display
indicates that the PAP is waiting for a handshake.
5. Type
‘
ri
’ (all commands are case sensitive) and press Enter.
The PAP should respond with the fi rmware version in the
form “
V0.XX mm/dd/yyyy
.” Repeat this step if necessary
to complete the handshake.
6. Request the last alert code and date by typing ‘
El
’ and
pressing Enter. The return value will be in the form ‘
Exx
dd/mm/yyyy
’.
Exx
is the alert code and dd/mm/yyyy is
the date the error occurred.
7. Clear the last alert code by typing ‘
Ec
’ and pressing Enter.
The PAP will respond with ‘
OK
’.
