Benchmark 5000-6000 Operation & Maintenance Manual
SECTION 6
– AERTRIM OPERATION
OMM-0118_B
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GF-203
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5/9/2019
Technical Support
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(800) 526-0288
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Mon-Fri, 8 am - 5 pm EST Page 88 of 148
6.7 AERtrim MAINTENANCE and TROUBLESHOOTING
The AERtrim system, which maximizes blower efficiency, depends on the O
2
sensor. The
AERtrim system needs only minimal maintenance. It is recommended that you
inspect the
oxygen sensor
for accuracy
every 12 months
by comparing it to a sensor reading from a
properly calibrated flue analyzer. This is strongly advised because contaminated air or gas
supplies may cause impurity buildup and shift the calibration point. An offset value of ±3% can
be entered in the Trim menu to correct the reading during manual calibration. If the sensor has a
large amount of offset, a replacement may be required soon.
Occasional software updates to the device may be required. See TID-0156 for the software
update procedure.
TABLE 6-2: AERtrim General Warnings
WARNING
CAUSE
POSSIBLE SOLUTIONS
O2 PERCENTAGE
LOW
O
2
Levels less than 2% for more
than 30 seconds {auto-reset when
valve comes back in range}
Dirty filter or poor combustion
calibration
– recalibrate unit
O
2
Offset too low
– Increase
Offset value
Bad Sensor-Replace
O2 SENSOR
MALFUNCTION
O
2
Levels less than -4% or more
than 24% for more than 10 seconds
{manual clearing of this fault is
required}
Bad Sensor-Replace
Communication Issue
– check
wires and connections
WARNING 02 LEVEL
HIGH
O
2
Levels > 9% and < 24% for more
than 30 seconds {auto-reset when
value comes back in range}
Gas Pressure Regulator or Air
Blower Problem, or bad
Combustion Calibration
O
2
Offset too high
Bad Sensor-Replace
O2 SENSOR OOR
MAINT REQUIRED
(OutOfRange)
Sensor auto calibration offset
required is more than ±3%
Reset Unit-Recalibrate Sensor
Bad Sensor-Replace
Bad ECU-Replace (Rare)
O2 WARNING
SERVICE REQUIRED
If the O
2
level is outside of its limits
for more than 5 minutes.
For example:
1) Reading < Lower Limit
& Blower Voltage = BV Limit
OR
2) Reading > Upper Limit
& Blower Voltage = BV Limit
Gas Supply, Air Filter, or Air
Blower issue
Bad Sensor-Replace
