AERCO Modulex EXT 321 - 1123 - Manual (Page 118)

MODULEX EXT 321, 481, 641, 802, 962, 1123 BOILERS
Installation, Operation & Maintenance Manual
BMM (Burner Management Module) Fault Codes 6.1.3
The table below lists the fault codes and troubleshooting tips associated with the BMM.
Table 6-4: BMM Fault Codes
CODE DESCRIPTION EFFECT CORRECTION RESET
E 1
High Limit (STB)
Thermostat
activated. All burners
turned OFF and
pump ON at
maximum speed. Check flow sensor thermal
connection to boiler. MANUAL - push
reset switch
when
temperature goes
below limit.
E 2
Low gas
pressure. All burners
turned OFF. Check gas pressure or gas
pressure switch. AUTOMATIC -
when gas
pressure switch
closes.
E 4
No flame
detected at
burner start. Burner control
lockout. Check flame rod or
combustion. MANUAL - push
reset switch or
cycle power.
E 5
Flame loss during
run. Ignition retry. Check combustion and
wiring. MANUAL - push
reset switch or
cycle power.
E 6
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 10
Internal failure. Ignition is
inhibited. Contact factory for new
BMM. MANUAL - cycle
the power.
E 11
Flame signal
detected before
ignition. Ignition is
inhibited. Disconnect flame rod wire
from BMM. If problem
goes away, change flame
rod and/or wire. If problem
does not go away, change
BMM. MANUAL - push
reset switch or
cycle power.
E 12
Flow sensor fault. All burners
turned OFF.
Check flow sensor or
wiring. AUTOMATIC
E 13 Aux sensor fault.
The boiler will
operate from the
Flow sensor
without the Aux
sensor.
Check aux sensor or
wiring.
AUTOMATIC
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12/01/14 Phone: 800-526-0288 GF-143