48
alarm relay will be energized. Lockouts are non-volatile and require a manual reset. Warnings are
dynamic and will self-remove when the condition causing the warning no longer exists.
The message O2 FAULT eXX contains the error message causing the lockout or warning event. The
error message 'eXX' is described in the following table:
e-code
VALUE
DESCRIPTION
44
BAD VECTOR
Incorrect communications with O2 probe
45
RETURN BOUNDS
46
BAD ERROR CODE
47
COMMUNICATION ERROR
Check wire, routing and connections to O2 probe
48
LOW LEVEL O2 LIMIT
O2 level exceeded limits set in O2 setup menu
49
HIGH LEVEL O2 LIMIT
50
O2 LOW STACK TEMP LEVEL
Flue temperature exceeded limits set in O2 setup
menu
51
O2 HIGH STACK TEMP LEVEL
52
RESERVED
53
RESERVED
54
STACK TEMP PROBE
DISCONNECTED
Hardware fault in probe
55
STACK TEMP OVER RANGE
Temp probe has exceeded its maximum range, 900F
(482C)
56
STACK TEMP READ ERROR
Hardware fault in probe
57
AMBIENT TEMP READ ERROR
Hardware fault in probe
58
AMBIENT TEMP OVER LIMIT
Temperature in probe has exceeded 185F (85C)–
check fan
59
AMBIENT TEMP UNDER LIMIT
Temperature in probe is lower than -13F (-25C)
60
CPU CRC ERROR
Hardware fault in probe
61
CPU RAM ERROR
62
CPU SELF TEST
63
24 VOLT LOW FAULT
Voltage in probe not within 18-30 vdc limits
64
24 VOLT HIGH FAULT
65
12 VOLT OPEN FAULT
Voltage regulator in probe out of acceptable
tolerance
66
12_VOLT_LOW_FAULT
67
12 VOLT HIGH FAULT
68
UNEXPECTED CALIBRATION FAULT
Illegal self-calibration perform
69
SENSOR O2 STUCK FAULT
O2 sensor not responding properly
70
SENSOR CALIBRATION NEEDED
O2 sensor subsystem cannot perform measurement
71
SENSOR HEATER SHORT FAULT
O2 heater fault
72
SENSOR HEATER OPEN FAULT
73
SENSOR PUMP SHORT FAULT
O2 pump fault
74
SENSOR PUMP OPEN FAULT
75
SENSOR CELL SHORT FAULT
O2 sensor fault
76
SENSOR CELL OPEN FAULT
77
SENSOR CONVERSION TIMEOUT
FAULT
O2 sensor taking too long to convert O2 level
78
SENSOR LOW VOLTAGE FAULT
O2 voltage level too low
79
SENSOR TOO COLD FAULT
O2 sensor heater temperature out of tolerance
80
SENSOR TOO HOT FAULT
81
SENSOR AIR CALIBRATING
Sensor calibration in progress
82
SENSOR HEATER CALIBRATING
Heater calibration in progress
83
SENSOR COMM BUSY
84
SENSOR COMM FAULT
Hardware fault in probe
85
SENSOR WARMING_UP
Sensor warming after power on
86
SENSOR IN STANDBY
O2 probe forced to standby condition