Bmm (Burner Management Module) Fault Codes - Watts AERCO EXT Installation, Operation & Maintenance Manual

Ufly Controller and BCM for Modulex EXT
CHAPTER 8: TROUBLESHOOTING

8.1.2 BMM (Burner Management Module) Fault Codes

The table below lists the fault codes and troubleshooting tips associated with the BMM.
CODE DESCRIPTION
BMM: 1
High Limit (STB)
Overheat
Thermostat activated.
thermostat
BMM: 4
No flame detected at
Ignition
burner start.
failure
BMM: 5
Flame loss during run. Ignition retry.
Flame lost
High outlet
BMM: 6 temperature. Flow
Overheating sensor temperature >
203°F.
BMM: 10
Internal Internal failure.
failure
BMM: 11
Flame signal detected
Unexpected
before ignition.
flame
BMM: 12
CH flow Flow sensor fault.
sensor
BMM: 14
Return sensor fault. -
CH return
NOT APPLICABLE
sensor
Maximum Δ-
temperature
protection.
Fault is detected if
BMM: 15 Local FlowSensor –
Differential Return Sensor] >
temperature [Param 483 + 50°F].
Note: Referred
parameter is BMM
Param. 483
Boiler pipe is frozen.
BMM: 16 Flow sensor
Frozen temperature is 36°F or
less.
OMM-0159_A • 6/28/2022
EFFECT
All burners turned OFF
and pump ON at
maximum speed.
Burner control lockout. Check flame rod or combustion.
All burners turned OFF
and pump ON at
maximum speed.
Ignition is inhibited.
Ignition is inhibited.
All burners turned OFF.
All burners turned OFF
and Pump ON at
maximum speed.
Ignition is inhibited.
Pump runs for 5 min at
max speed.
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
CORRECTION
Check flow sensor thermal
connection to boiler.
Check combustion and wiring.
Check flow sensor or system
pump
Contact factory for new BMM.
Disconnect flame rod wire from
BMM. If problem goes away,
change flame rod and/or wire. If
problem does not go away,
change BMM.
Check flow sensor and its
resistance using the
resistance/Temp table); check the
sensor connections.
Check the system installation.
Carefully defrost boiler.
RESET
MANUAL - push
reset switch
when
temperature
goes below
limit.
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 -
Fault is cleared
when [Local
FlowSensor –
Return Sensor]
< Param 483.
Note: Referred
parameter is
BMM Param.
483
AUTOMATIC -
when flow
sensor is greater
than 41°F.
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