50
PN 240011430 REV. Q [03/15/2022]
H
J
K
2
Overheat thermostat operated or
faulty.
Check for and correct any system
faults (water circulation).
NO
�I
Allow to cool. Continuity
across thermostat terminals
more than 1.5 ohm
� Replace safety thermostat
'---------------'
NO
Check Flow, Return,
sensors. See section 'D'
YES
CH system pressure less than
7.25 psi or more than
4
3 psi.
Restore System Pressure
NO
Ensure correct circulation of
the pump
YES
YES
Check wiring and pcb connection at
connector x22 is there approx. 5 V
DC between the green and black
NO
terminals
Check flow temperature sensor connections
and position. Sensors swapped.
Cold resistance approximately.
1 OkO @ 77' F (CH sensors)
(resistance reduces with increase in temp.)
YES
I
• I
.I
I
Is E11 O is still flashing
Replace pressure sensor
Replace PCB
I
Replace sensor
Go to section 'B'
Is there 120V at:
PCB connector x13 3 way valve terminals
Blue to Black central heating mode
Blue to Brown domestic hot water mode
See Wiring Diagram
YES
Replace PCB
Check 3 way valve cable.
Motor, 3 way valve
Replace motor 3 way valve
Replace PCB
I
FAULT SOLUTION SECTIONS
Summary of Contents for Dunkirk DCB-100
Page 2: ...DCC 205...
Page 4: ...DCB 165...
Page 79: ...75 A 2 MODEL 75 100 Heat Only APPENDIX A WIRING DIAGRAMS 240013501 REV A 03 15 2022...
Page 80: ...76 APPENDIX A WIRING DIAGRAMS A 2 MODEL 125 Heat Only 240013501 REV A 03 15 2022...
Page 81: ...77 APPENDIX A WIRING DIAGRAMS A 3 MODEL 165 Heat Only 240013501 REV A 03 15 2022...
Page 82: ...78 APPENDIX A WIRING DIAGRAMS A 1 MODEL 115 Combi 240013501 REV A 03 15 2022...
Page 83: ...79 APPENDIX A WIRING DIAGRAMS A 4 MODEL 150 Combi 240013501 REV A 03 15 2022...
Page 84: ...80 APPENDIX A WIRING DIAGRAMS A 5 MODEL 205 Combi 240013501 REV A 03 15 2022...
Page 85: ...81 NOTES 240013501 REV A 03 15 2022...
Page 86: ...82 NOTES 240013501 REV A 03 15 2022...
Page 121: ...33 PN 240011430 REV Q 03 15 2022 75 100 HEAT ONLY WIRING DIAGRAM MODEL 75 100 HEAT ONLY...
Page 122: ...34 PN 240011430 REV Q 03 15 2022 MODEL 125 HEAT ONLY 125 HEAT ONLY WIRING DIAGRAM...
Page 123: ...35 PN 240011430 REV Q 03 15 2022 MODEL 165 HEAT ONLY 165 HEAT ONLY WIRING DIAGRAM...
Page 124: ...36 PN 240011430 REV Q 03 15 2022 115 COMBI WIRING DIAGRAM MODEL 115 COMBI...
Page 125: ...37 PN 240011430 REV Q 03 15 2022 MODEL 150 COMBI 150 COMBI WIRING DIAGRAM...
Page 126: ...38 PN 240011430 REV Q 03 15 2022 MODEL 205 COMBI 205 COMBI WIRING DIAGRAM...
Page 132: ...44 PN 240011430 REV Q 03 15 2022 LOW WATER CUTOFF DETAIL LOW WATER CUTOFF NO NO YES...
Page 137: ...49 PN 240011430 REV Q 03 15 2022 3 FAULT SOLUTION SECTIONS...
