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AERCO Control System (ACS)
APPENDIX B:
Status and Fault Messages
Page 100 of 139
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
11/22/2017
GF-131
Phone: 800-526-0288
OMM-0081_0F
TABLE B-6: BMM (Boiler Management Module) Fault Codes
Code
Description
Effect
Correction
Reset
16
Boiler Pipe is
frozen.
FlowSensor
temperature is
36°F or less.
Ignition is
inhibited. Pump
runs for 5 min at
max speed.
Carefully defrost boiler
AUTOMATIC - when
FlowSensor is greater
than 41°F.
20
Flame signal
detected after
burner is OFF.
Ignition is
inhibited.
Disconnect gas valve
wire from BMM. If failure
goes away, check wiring
or change BMM. If failure
remains check or change
gas valve.
MANUAL - push reset
switch or cycle power.
22
No air flow at
burner after fan
started for 30
seconds.
Ignition retry after
60 second delay
and failure
remains until we
have a successful
burner operation.
If fan is stopped, check
supply voltage and fan
wiring. If OK try another
fan. If still not working
change the BMM.
If fan is not stopped,
check the exhaust gas
outlet for blockage. If OK
then check the air
pressure switch wiring. If
still not working try
another air pressure
switch. If still not
working, change the
BMM.
AUTOMATIC/MANUAL
23
The air pressure
switch doesn't
switch off.
Ignition is
inhibited.
Disconnect the air
proving switch. If
problem goes away install
a new switch. If not,
check the wiring. If wiring
OK then change BMM.
AUTOMATIC
24
Fan speed out of
control: It doesn't
reach pre-purge
speed within 30
seconds.
Ignition retry after
60 second delay
and failure
remains until we
have a successful
burner operation.
Check fan wiring.
AUTOMATIC/MANUAL
26
Fan speed out of
control: It doesn't
stop within 30
seconds after
turned OFF.
Ignition is
inhibited.
Check fan wiring.
AUTOMATIC