3. Troubleshooting Cycle Faults
CF
No.
Unit
type
Software revision
Description of Fault
Probable Cause (or causes) of Fault
S
Non
S
1.xx/
2.xx
4.xx 5.xx 6.xx
86
Unexpected SPI Interrupt.
• Interference (electrical noise)
87
Unexpected IRQ Interrupt
• Interference (electrical noise)
88
The buffer pointers and sample counter are
initialized incorrectly.
• This occurs if the boiler calibration
routine is executed when it was not
expected to, (caused by electrical noise
or ESD.)
89
The software state machine has detected
incorrect input parameters.
• Usually caused by noise and ESD.
90
Corrupted or not initialized chamber calibration
value
• This occurs when a new controller board
or microprocessor has been installed.
• This may also happen when the unit has
been subjected to a strong static
discharge corrupting the memory.
This occurs when a new controller board
or microprocessor has been installed.
This may also happen when the unit has
been subjected to a strong static
discharge corrupting the memory.
• Re-calibrate the chamber
thermocouple.
91
C
•
•
•
Re-calibrate the pressure sensor.
91
Corrupted or not initialized pressure calibration
•
•
•
95
•
CF_EEPROM_ERROR
• Failure to read EEPROM messages
from 4C512 EEPROM (EEPROM
not programmed)
94
•
CF_COMM_ERROR
• The LCD controller PCB failed to receive
messages from the Rev 7 PCB.
• • • No connection between Colour LCD
Controller and Rev 7PCB;
Check cable / connection.
• • • • Verify that MCU is properly inserted
into the socket on the Rev 7 PCB.
• Verify that 5V is available on the Rev 7
PCB (Green LED ON)
98
Microcontroller fails to communicate with ADC
(Analog to Digital Converter)
• Hardware failure.
• MCU not inserted properly in the socket
• Damaged ADC converter, replace PCB.
• If a PCB adapter is used, verify that
PCB adapter is properly secured in the
socket and that there are no bent pins
99
The microprocessor's internal watchdog
timer has tripped.
•
Incorrect operation of the software,
usually noise or ESD related.
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