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Modulex Light Commericial Series
CHAPTER 7: Troubleshooting
BMM (Burner Management Module) Fault Codes
The table below lists the fault codes and troubleshooting tips associated with the BMM.
TABLE 7-4: BMM Fault Codes
CODE
DESCRIPTION
High Limit (STB)
Thermostat
E 1
activated.
Low gas
pressure.
E 2
No flame
E 4
detected at
burner start.
Flame loss during
E 5
run.
High outlet
temperature.
E 6
Flow sensor
temperature >
203°F.
Internal failure.
E 10
Flame signal
detected before
ignition.
E 11
Flow sensor fault.
E 12
E 13
Aux sensor fault.
OMM-0087_J • GF-143 • 11/17/2020
EFFECT
All burners
Check flow sensor thermal
turned OFF and
connection to boiler.
pump ON at
maximum speed.
All burners
Check gas pressure or gas
turned OFF.
pressure switch.
Burner control
Check flame rod or
lockout.
combustion.
Ignition retry.
Check combustion and
wiring.
All burners
Check flow sensor or
turned OFF and
system pump
pump ON at
maximum speed.
Ignition is
Contact factory for new
inhibited.
BMM.
Ignition is
Disconnect flame rod wire
inhibited.
from BMM. If problem
goes away, change flame
rod and/or wire. If problem
does not go away, change
BMM.
All burners
Check flow sensor or
turned OFF.
wiring.
The boiler will
operate from the
Check aux sensor or
Flow sensor
wiring.
without the Aux
sensor.
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
CORRECTION
RESET
MANUAL - push
reset switch
when
temperature goes
below limit.
AUTOMATIC -
when gas
pressure switch
closes.
MANUAL - push
reset switch or
cycle power.
MANUAL - push
reset switch or
cycle power.
AUTOMATIC -
when Flow
sensor < 176°F.
MANUAL - cycle
the power.
MANUAL - push
reset switch or
cycle power.
AUTOMATIC
AUTOMATIC
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