Ufly Controller and BCM for Modulex EXT
CHAPTER 8: TROUBLESHOOTING
OMM-0159_A
• 6/28/2022 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
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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
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.
Summary of Contents for AERCO EXT
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