Watts AERCO EXT Installation, Operation & Maintenance Manual page 75

Ufly Controller and BCM for Modulex EXT
CHAPTER 8: TROUBLESHOOTING
CODE DESCRIPTION
Air pressure switch
BMM: 22
does not close within
Lack air for
30 sec. in the ignition
ignition
cycle
BMM: 23
Air pressure switch
Unexpected
always active
air flux
Modulating fan speed
failure: failed to reach
BMM: 24
the correct speed
Low fan
within 30 seconds
speed
from starting of burner
ignition cycle.
Modulating fan speed
BMM: 26
failure: failed to stop
High fan
within 30 seconds
speed
from end of operation
Air pressure switch
BMM: 27
fault during the
Lack of air
ignition time
Alteration of the
BMM: 30
operating parameters
Service
caused by EMC
parameters
disturbances.
BMM: 32
Mains supply voltage <
Low supply
108 VAC.
tension
OMM-0159_A • 6/28/2022
EFFECT
Ignition retry after 60
second delay and
failure remains until a
successful burner
operation.
Ignition is inhibited.
Ignition retry after 60
second delay and
failure remains until
we have a successful
burner operation.
Ignition is inhibited.
Restart pre-purge
timer. The failure
remains until we have
a successful burner
operation.
Ignition is inhibited.
Pump runs for 5 min at
max speed.
Wait for proper line
voltage (>102 VAC).
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
CORRECTION
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, check the air pressure switch
wiring. If still not working, try
another air pressure switch. If
still not working, change the
BMM.
Disconnect the air proving switch.
If problem goes away, install a
new switch. If not, check the
wiring. If wiring is OK, change
BMM.
Check fan wiring.
Check fan wiring.
Check fan and wiring. Check air
proving switch and wiring.
Re-program the settings. Contact
factory.
Check input voltage. Try another
BMM.
RESET
AUTOMATIC/M
ANUAL
AUTOMATIC
AUTOMATIC/M
ANUAL
AUTOMATIC
AUTOMATIC
MANUAL - cycle
the power or
send reset
message.
AUTOMATIC
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