Watts Aerco Modulex MLX EXT 1530 - BCM (Boiler Communications Module) Fault Codes

Modulex EXT Commercial Series Boilers User Manual
CHAPTER 7: Troubleshooting
OMM-0095_0H AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 115 of 144
GF-139 Phone: 800-526-0288 09/15/2017
7.1.2 BCM (Boiler Communications Module) Fault Codes
The table below lists the fault codes and troubleshooting tips associated with the BCM.
TABLE 7-3: BCM Fault Codes
CODE DESCRIPTION EFFECT CORRECTION RESET
E 17
Boiler pipe is frozen.
Flow sensor temp. 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.
E 18
Maximum Δ-
temperature protection.
Flow temperature -
Return Temperature >
Water Δ-Temp
Protection + 50°F
All burners turned
OFF and Pump
ON at maximum
speed.
Check the
system
installation.
AUTOMATIC - when Δ-
temperature < Water Δ-
Temp Protection.
E 19
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.
E 37
BCM: Internal fault
E 38
Settings corrupted by
electromagnetic
interference.
Ignition is
inhibited. Pump
runs for 5 min at
max speed.
Re-program
the settings.
Contact
factory.
MANUAL - push reset
switch or cycle power.
E 56
BCM: No remote
control detected
E 57
BCM: No BMM
detected
E 58
BCM: Sensor global
flow detected.
Ignition is
inhibited.
Close request
input for
manual
operation.
MANUAL - push reset
switch or cycle power.