Watts Aerco Modulex MLX EXT 1530 - BMM (Burner Management Module) Fault Codes

Modulex EXT Commercial Series Boilers User Manual
CHAPTER 7: Troubleshooting
Page 116 of 144 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0095_0H
09/15/2017 Phone: 800-526-0288 GF-139
7.1.3 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 EFFECT CORRECTION RESET
E 1
High Limit (STB)
Thermostat
activated.
All burners
turned OFF and
pump ON at
maximum speed.
Check flow sensor thermal
connection to boiler.
MANUAL - push
reset switch
when
temperature goes
below limit.
E 2
Low gas
pressure.
All burners
turned OFF.
Check gas pressure or gas
pressure switch.
AUTOMATIC -
when gas
pressure switch
closes.
E 4
No flame
detected at
burner start.
Burner control
lockout.
Check flame rod or
combustion.
MANUAL - push
reset switch or
cycle power.
E 5
Flame loss during
run.
Ignition retry.
Check combustion and
wiring.
MANUAL - push
reset switch or
cycle power.
E 6
High outlet
temperature.
Flow sensor
temperature >
203°F.
All burners
turned OFF and
pump ON at
maximum speed.
Check flow sensor or
system pump
AUTOMATIC -
when Flow
sensor < 176°F.
E 10
Internal failure.
Ignition is
inhibited.
Contact factory for new
BMM.
MANUAL - cycle
the power.
E 11
Flame signal
detected before
ignition.
Ignition is
inhibited.
Disconnect flame rod wire
from BMM. If problem
goes away, change flame
rod and/or wire. If problem
does not go away, change
BMM.
MANUAL - push
reset switch or
cycle power.
E 12
Flow sensor fault.
All burners
turned OFF.
Check flow sensor or
wiring.
AUTOMATIC
E 13
Aux sensor fault.
The boiler will
operate from the
Flow sensor
without the Aux
sensor.
Check aux sensor or
wiring.
AUTOMATIC