MC2: 10/03/12 Page 75 of 90
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Modulex MLX Series Gas Fired Boiler System
Operation and Maintenance Manual
Troubleshooting
FAULT
PROBABLE
CORRECTIVE ACTION
E90:
E8: BUS
addresses 0 and 1
both used. BUS
address 0 and 1
may not be used
Bus setting incorrect. Change setting to use only one bus.
E91:
E8: BUS ID
already used. The
set BUS ID is
already in use by
BMM rotary switches
improperly set –
duplicate address
settings.
Select unused BUS ID address for device.
E99:
E8: Internal failure
E-8 failure Replace the E-8
E200:
E8: Complete
communication
loss to/from the
E8 such as would
occur when the
three way switch is
flipped to BCM
control
1. bcm three-way
switch is in the
wrong position
(zero position)
2. Loose e-buss
connection (pink
and grey wires)
1. E200 fault is normal when the BMC is control by an
outside source using Modbus. (BMS II or EMS/BAS)
2. Check connection or replace harness.
E201:
E8:
Communication
Error Module 1
BMM Board failure.
BMM Board harness
failure
Check with Desmond
E202:
E8:
Communication
Error Module 2
Same as E201
BMM Board failure.
BMM Board harness
failure
Check with Desmond
Table 10-1: Boiler Troubleshooting – System Manager – Defective Sensor (Cont.)
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