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Modulex EXT Commercial Series
CHAPTER 8: Maintenance Schedule
OMM-0160_A
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7.1.2 BMM (Burner Management Module) Fault Codes
The table below lists the fault codes and troubleshooting tips associated with the BMM.
CODE
DESCRIPTION
EFFECT
CORRECTION
RESET
BMM: 1
Overheat
thermostat
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.
BMM: 4
Ignition failure
No flame detected at
burner start.
Burner control
lockout.
Check flame rod or combustion.
MANUAL -
push reset
switch or cycle
power.
BMM: 5
Flame lost
Flame loss during
run.
Ignition retry.
Check combustion and wiring.
MANUAL -
push reset
switch or cycle
power.
BMM: 6
Overheating
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.
BMM: 10
Internal
failure
Internal failure.
Ignition is inhibited.
Contact factory for new BMM.
MANUAL -
cycle the
power.
BMM: 11
Unexpected
flame
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.
BMM: 12
CH flow
sensor
Flow sensor fault.
All burners turned
OFF.
Check flow sensor and its
resistance using the
resistance/Temp table); check
the sensor connections.
AUTOMATIC
BMM: 14
CH return
sensor
Return sensor fault.
-
NOT APPLICABLE
BMM: 15
Differential
temperature
Maximum Δ
-
temperature
protection.
Fault is detected if
Local FlowSensor
–
Return Sensor] >
[Param 483 + 50°F].
Note: Referred
parameter is BMM
Param. 483
All burners turned
OFF and Pump ON at
maximum speed.
Check the system installation.
AUTOMATIC -
Fault is cleared
when [Local
FlowSensor
–
Return Sensor]
< Param 483.
Note: Referred
parameter is
BMM Param.
483
BMM: 16
Frozen
Boiler pipe is frozen.
Flow sensor
temperature is 36°F
or less.
Ignition is inhibited.
Pump runs for 5 min
at max speed.
Carefully defrost boiler.
AUTOMATIC -
when flow
sensor is
greater than
41°F.
Содержание AERCO MLX EXT 1500 2S
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