43
FAULT SOLUTION SECTIONS
L
M
N
0
p
Is main water filter and assembly
clean and rotor free to move
?
1.
NO
Clean or replace
YES
PCB connector x22
Hall effect sensor terminals.
Check that the voltage is approximately
5 VDC between Red and Blue
See Wiring Diagram
NO
Replace PCB
f----i��
I
Replace sensor
NO
I
Temperature sensors faulty.
Cold resistance approximately
1 0kO @
77
' F (CH sensor)
20kO @
77
' F (Flue sensor)
(resistance reduces with increase in temp.)
·1�---�
2.
If pump is running the heat exchanger could be
obstructed
Performs the autocalibration function (see the Service manual)
YES
YES
�
I
Replace heat exchanger
·1�-----�
Display blank
Verify the position of the Service key
Check obstruction in the flue duct
YES
Remove the obstruction on the flue pipe
NO
Performs the calibration function (see the Service manual)
Check the electrical connection
between Ru and pcb
Replace Hall Effect Sensor
Is main water filter and
assembly clean and
rotor free to move?
L
PCB connector x22 Hall
effect sensor terminals.
Check the voltage is
approximately 5 VDC
between the Red and
Blue wires. See Wiring
Diagrams.
With water running
through DHW circuit,
measure red and white
wire for 2.8 VDC for
flow triggering.
Check DHW NTC
senor for proper OHM
value
Replace PCB
YES
YES
YES
YES
Clean or Replace
Replace PCB
Replace Hall Effect Sensor
Replace DHW NTC sensor
NO
NO
NO
NO
PN 240012875 REV. A [01/31/2020]
Summary of Contents for Dunkirk DCBF-125
Page 63: ...61 A 1 MODELS 125 Heat Only APPENDIX A WIRING DIAGRAMS 240012879 REV A 01 31 2020...
Page 64: ...62 APPENDIX A WIRING DIAGRAMS A 2 MODELS 165 Heat Only 240012879 REV A 01 31 2020...
Page 65: ...63 A 2 MODELS 150 Combi APPENDIX A WIRING DIAGRAMS 240012879 REV A 01 31 2020...
Page 66: ...64 A 4 MODELS 205 Combi APPENDIX A WIRING DIAGRAMS 240012879 REV A 01 31 2020...
Page 67: ...65 NOTES 240012879 REV A 01 31 2020...
Page 68: ...66 NOTES 240012879 REV A 01 31 2020...
Page 99: ...29 MODEL 150F Combi 150F FLOOR STANDING COMBI WIRING DIAGRAM PN 240012875 REV A 01 31 2020...
Page 101: ...31 205F FLOOR STANDING COMBI WIRING DIAGRAM MODEL 205F Combi PN 240012875 REV A 01 31 2020...
Page 106: ...36 Low Water Cutoff Detail LOW WATER CUTOFF NO NO YES PN 240012875 REV A 01 31 2020...
Page 114: ...44 NOTES PN 240012875 REV A 01 31 2020...
