Watts AERCO EXT Installation, Operation & Maintenance Manual page 73

Ufly Controller and BCM for Modulex EXT
CHAPTER 8: TROUBLESHOOTING
FAULT CODE
Low system flow
rate.
Water flow is not
HCM: 40 detected by sensor
Low water flowrate connected to BCM
terminal Y2/FL-TA 20
seconds after the
Pump activation.
HCM: 56 BCM: No remote
Heat control lack control detected
HCM: 57 BCM: No BMM
Burners lack detected
HCM: 58
BCM: Sensor global
Global temperature
flow detected.
sensor
Water deficiency
HCM: 73
pressure switch -
Flow sensor
NOT APPLICABLE
HCM: 93 AUXILIARY SAFETY
Security block INTERVENTION
OMM-0159_A • 6/28/2022
DESCRIPTION EFFECT
Burners turned OFF.
Burners turned OFF.
Burners turned OFF.
Stop burner and stop
pump
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
CORRECTION
Check water flow or
AUTOMATIC
check switch.
It is possible to
activate burner
ignition from the
BCM manual request
button
Check electrical
connections BMM AUTOMATIC
and e-BUS
Check the flow
sensor connection. AUTOMATIC
Replace the sensor.
check the jumper or
safety devices wired
MANUAL
to connector Y2,
terminals 11/2.
Page 73 of 83
RESET