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

Ufly Controller and BCM for Modulex EXT
CHAPTER 8: TROUBLESHOOTING

8.1.1 BCM (Boiler Communications Module) Fault Codes

The table below lists the fault codes and troubleshooting tips associated with the BCM.
FAULT CODE
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 by
HCM: 38
electromagnetic
Factory parameters
interference.
Settings corrupted by
HCM: 39
electromagnetic
User parameters
interference.
OMM-0159_A • 6/28/2022
DESCRIPTION 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.
None
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
CORRECTION
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
Check circulation, Sensor] < Param 483.
check installation
Note: Referred
parameter is BCM
Param. 483
Check Flow Sensor or AUTOMATIC - when
system pump. Flow sensor < 176°F.
Check flue/chimney MANUAL
Check for water in
AUTOMATIC
the exhaust manifold
MANUAL - push reset
Contact factory.
switch
Contact factory. MANUAL
MANUAL - push reset
Contact factory.
switch
Contact factory. AUTO
Page 72 of 83
RESET