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

Modulex EXT Commercial Series
CHAPTER 8: Maintenance Schedule
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
BMM: 1 High Limit (STB)
Overheat Thermostat
thermostat activated.
BMM: 4 No flame detected at
Ignition failure burner start.
BMM: 5 Flame loss during
Flame lost run.
High outlet
BMM: 6 temperature. Flow
Overheating sensor temperature >
203°F.
BMM: 10
Internal Internal failure.
failure
BMM: 11 Flame signal
Unexpected detected before
flame ignition.
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-0160_A • DRAFT
EFFECT
All burners turned
OFF and pump ON at
maximum speed.
Burner control
lockout.
Ignition retry.
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 flame rod or combustion.
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.
Page 94 of 117
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.