B
I
PAP S
YNCHRONY
S
ERVICE
& T
ECHNICAL
I
NFORMATION
1032443, R
EV
. 00
T
ROUBLESHOOTING
& D
IAGNOSTICS
- P
AGE
22
Error
Code
Description of Error
Probable Cause
Corrective Action
E38
Real-Time Clock not Ticking
Defective Microprocessor
Defective Crystal
Replace Main PCA
Replace Main PCA
E39
Unable to Queue Data to User
Interface
Defective FLASH or RAM
chip
Replace Main PCA
E40
Invalid Built-in Self Test Call
Invalid RASP command
Reissue RASP
Command
E41
Over Pressure Condition
Occluded or Restricted
Pressure Tube
Defective Pressure Sensor
Defective Motor Drive chip
Defective Valve
Replace Pressure
Tubing
Replace Main PCA
Replace Main PCA
Replace Valve
E42
Operating System not
Responding to Software
Defective FLASH or RAM
chip
Replace Main PCA
E43
Insufficient Voltage for Audible
Alarm
Defective PCA
Replace Main PCA
E44
12V Reference Out of Range
Defective Power Supply
Replace Main PCA
E45
5V Reference Out of Range
Defective Power Supply
Replace Main PCA
E46
Bulk Voltage Out of Range
Defective Power Supply
Replace Main PCA
E47
-15V Reference Out of Range
Defective Power Supply
Replace Main PCA
E48
Railed Flow Sensor
Occluded or Restricted Flow
Tube
Defective Flow Sensor
Replace Flow Tube
Replace Main PCA
E49
Blower Pressure Sensor Failure
Occluded or Restricted
Pressure Tube
Defective Blower Pressure
Sensor
Replace Pressure
Tubing
Replace Main PCA
E50
Flash Memory Failure
Defective FLASH chip
Replace Main PCA
E51
Unrecognized Main PCA
Needs New Software
Defective PCA
Replace Main PCA
Replace Main PCA
E52
Blower Failure
Stalled or Locked Blower
Defective Motor Drive Chip
Replace Blower
Replace Main PCA
E53
Blower Speed Out of Tolerance
Stalled or Locked Blower
Defective Motor Drive Chip
Replace Blower
Replace Main PCA
E54
Motor Current High While Blower
Off
Stalled or Locked Blower
Defective Motor Drive Chip
Replace Blower
Replace Main PCA