Daikin ComfortNet DX7TC Service Instructions Manual page 108

TROUBLESHOOTING
Troubleshooting
Error Code:
B0 - Blower motor not running
B1 - Blower motor communication
error
Applicable Models:
DV**REC
DV**PEC
Methof of Error Detection:
B0 - Number of revolutions of the
blower motor
B1 - Motor communication status
Error Decision Conditions:
B0 - When feedback rpm<50 is
detected for 5 times or when
checked feedback rpm <50
reached 100 times. (When
checked feedback rpm reaches
720 times.)
B1 - When the communication
from the motor can not be
received correctly 5 seconds in a
continuous.
108
Board Flashes
B0 & B1
Check wiring harness and
wiring connections. Correct
loose wiring issue. OHM motor
for open or shorted circuit.
Is motor
No
open or
shorted?
Yes
Check for primary
voltage to blower motor.
Is the power supply
No
No
voltage between
104 and 127 vAC
(115vAC + 10%)?
(Typically 115 – 127vAC)
Yes
Yes
Check control
voltage between
No
pins 1 & 4. Voltage
should be between
3-15vDC (Typically
9-15vDC?
Yes
ERROR CODE B0 & B1
Error Code B0 & B1
Replace motor if open or
shorted.
Correct power supply if out of
range. Replace motor if
necessary.
Check control voltage at the
control board. Replace
integrated control board if
necessary.
Test ECM motor and controller
with ECM tester. Replace motor
and/or controller if necessary.