46
Domestic hot water
Turn on mains power.
The display illuminates
NO
If
!
09,
!
15 and
!
384 is flashing or re-occurs regularly
check all PCB connections, if this has no effect replace
the PCB.
YES
Error 110 or 133 or 134
or 135 or 125 or 384 or
09 or 15 flashing
NO
YES
Go to section 'A'
Press the 'Reset' button for
between 1-3 seconds
Go to section 'D',
NO
If the E11 o is still flashing. Go
to section 'H'
Error 20, 28, 40, 50, 321 or 431 flashing
if E55 is displayed go to section N
NO
YES
Error 117 or 118 flashing
Go to section 'I'
NO
DH\V Top. Symbol nashcs
�---'-------,,/c,
Open DHW tap fully.
Pump runs.
YES
Fan runs after up to 3 seconds
YES
Fan runs at correct speed
YES
Spark at ignition electrodes for
up to 5 seconds and for 5
attempts.
YES
NO
YES
Burner lights
YES
YES
Error E109 flashing
NO
Error E110 flashing
YES
NO
NO
NO
NO
DHW flow rate more
than 21/min
Error 160 flashing
Go to section 'C'
Error 160 flashing
Go to section 'C'
Error 133 flashing
Go to section 'E'
Burner does not stay alight
after 5 seconds
Error E125 flashing
after 1 minute
Go to section 'H'
NO
Go to section 'L'
NO
If E53 is displayed go to section 0
YES
1------�
--
Go to section 'F'
YES
YES
Error 128 or E129 flashing (loss of flame 12
times) Go to section 'G'
Go to section 'J'
3 way valve open to domestic
hot water circuit
NO
1----1�
.. �o to section 'K'
�-----------�
NO
Burner output modulates to
maintain the temperature set
YES
YES
Error E130 flashing
NO
YES
Burner goes out
NO
Check the Central Heating NTC sensor
Go to section 'D'
Go to section 'M'
Fan stops after 30 seconds
YES
Operation sequence
successful
TROUBLESHOOTING CHART
PN 240011430 REV. O [07/01/2021]
Summary of Contents for Utica Boilers MAC-115
Page 2: ...MAC 205...
Page 4: ...MAH 165...
Page 77: ...73 APPENDIX A WIRING DIAGRAMS A 2 MODEL 125 Heat Only 240013354 REV A 07 01 2021...
Page 78: ...74 APPENDIX A WIRING DIAGRAMS A 3 MODEL 165 Heat Only 240013354 REV A 07 01 2021...
Page 79: ...75 APPENDIX A WIRING DIAGRAMS A 1 MODEL 115 Combi 240013354 REV A 07 01 2021...
Page 80: ...76 APPENDIX A WIRING DIAGRAMS A 4 MODEL 150 Combi 240013354 REV A 07 01 2021...
Page 81: ...77 APPENDIX A WIRING DIAGRAMS A 5 MODEL 205 Combi 240013354 REV A 07 01 2021...
Page 117: ...34 MODEL 125 Heat Only 125 HEAT ONLY WIRING DIAGRAM PN 240011430 REV O 07 01 2021...
Page 118: ...35 MODEL 165 Heat Only 165 HEAT ONLY WIRING DIAGRAM PN 240011430 REV O 07 01 2021...
Page 119: ...36 115 COMBI WIRING DIAGRAM MODEL 115 Combi PN 240011430 REV O 07 01 2021...
Page 120: ...37 MODEL 150 Combi 150 COMBI WIRING DIAGRAM PN 240011430 REV O 07 01 2021...
Page 121: ...38 MODEL 205 Combi 205 COMBI WIRING DIAGRAM PN 240011430 REV O 07 01 2021...
Page 126: ...43 Low Water Cutoff Detail LOW WATER CUTOFF NO NO YES PN 240011430 REV O 07 01 2021...
Page 131: ...48 3 FAULT SOLUTION SECTIONS PN 240011430 REV O 07 01 2021...