Bcm (Boiler Communications Module) Fault Codes - Watts AERCO EXT Installation, Operation & Maintenance Manual

Modulex EXT Commercial Series
CHAPTER 8: Maintenance Schedule
7.1.1

BCM (Boiler Communications Module) Fault Codes

The table below lists the fault codes and troubleshooting tips associated with the BCM.
FAULT CODE DESCRIPTION
HCM: 2 Gas Pressure Switch
Low gas pressure - NOT APPLICABLE.
HCM: 8 Water Deficiency -
Low water pression NOT APPLICABLE.
HCM: 9 Outdoor sensor
Outer temperature Enabled but not
sensor connected
HCM: 13
DOMESTIC HOT
DHW Temperature
WATER sensor fault
sensor
HCM: 14 Global return sensor
CH return sensor failure
Boiler pipe is frozen.
HCM: 17
Flow sensor temp. is
Global frozen
36°F or less.
Maximum Δ-
temperature
protection.
Fault is detected if
HCM: 18 [Global FlowSensor –
Global differential Return Sensor] >
temperature [Param 483 + 50°F].
Note: Referred
parameter is BCM
Param. 483
High outlet
HCM: 19 temperature. Flow
Global overheating sensor temperature
> 203°F.
HCM: 28 Flue/Chimney
Chimney closed Obstruction
Water inside the
HCM: 29
combustion
Condense level
chamber.
HCM: 30
Settings corrupted.
Service parameters
HCM: 37
BCM: Internal fault
Parameters memory
Settings corrupted
HCM: 38
by electromagnetic
Factory parameters
interference.
OMM-0160_A • DRAFT
EFFECT
Outdoor Reset not
available.
DHW service not
active
All burners turned
OFF.
Ignition is inhibited.
Pump runs for 5 min
at max speed.
All burners turned
OFF and Pump ON at
maximum speed.
All burners turned
OFF and pump ON at
maximum speed.
Ignition is inhibited.
Ignition is inhibited.
Ignition is inhibited.
Ignition is inhibited.
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
CORRECTION RESET
AUTOMATIC -
Outdoor Reset will
be available once
outdoor sensor is
connected.
Check DHW sensor
and its resistance
using the
AUTOMATIC
resistance/Temp
table); check the
sensor connections.
Check return sensor
AUTOMATIC
or wiring.
AUTOMATIC - when
Carefully defrost
Flow sensor is
boiler.
greater than 41°F.
AUTOMATIC - Fault
is cleared when
[Global FlowSensor –
Return Sensor] <
Check circulation,
Param 483.
check installation
Note: Referred
parameter is BCM
Param. 483
Check Flow Sensor AUTOMATIC - when
or system pump. Flow sensor < 176°F.
Check flue/chimney MANUAL
Check for water in
AUTOMATIC
the exhaust manifold
MANUAL - push
Contact factory.
reset switch
Contact factory. MANUAL
MANUAL - push
Contact factory.
reset switch
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