ECR International Dunkirk DCBF-125 Installation, Operation And Maintenance Manual page 113

L
Is main water filter and
L
assembly clean and
Is main water filter and assembly
rotor free to move?
clean and rotor free to move?
NO
NO
Clean or replace
Clean or Replace
M
Temperature sensors faulty.
1.
Cold resistance approximately
1 0kO @ 77' F (CH sensor)
20kO @ 77' F (Flue sensor)
(resistance reduces with increase in temp.)
2. If pump is running the heat exchanger could be
obstructed
N
Performs the autocalibration function (see the Service manual)
YES
Display blank
0
Check obstruction in the flue duct
Performs the calibration function (see the Service manual)
p
Check the electrical connection
between Ru and pcb
FAULT SOLUTION SECTIONS
PCB connector x22 Hall
effect sensor terminals.
YES
PCB connector x22
Check the voltage is YES
YES
Hall effect sensor terminals.
approximately 5 VDC
Check that the voltage is approximately
between the Red and
5 VDC between Red and Blue
Blue wires. See Wiring
See Wiring Diagram
Diagrams.
NO
Replace PCB
NO
f----i� �
Verify the position of the Service key
YES
Remove the obstruction on the flue pipe
NO
With water running
YES
through DHW circuit,
measure red and white
wire for 2.8 VDC for
flow triggering.
NO
NO
Replace Hall Effect Sensor
Replace PCB
I I
Replace sensor
·1 � ---�
YES
�
I
Replace heat exchanger
·1 � -----�
43
Check DHW NTC
YES
senor for proper OHM
value
Replace Hall Effect Sensor
NO
Replace DHW NTC sensor
PN 240012875 REV. A [01/31/2020]
Replace PCB