Service manual - Logamax plus GB142 (USA/CA) - en - Buderus

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8Actions• Test the ionization cable between the plug and socket connectionand the UBA 3 installation base to make sure that it has noshort circuit to earth (see fig. 27 and fig. 110 on page 126) andthat it is not broken anywhere (see fig. 28).• Assemble the plug and socket connection of the ionization electrode.• Re-assemble the UBA 3 in reverse order of disassembly.• Fit the casing.• Switch on the power supply of the heating system on the circuitbreaker.• Set the main switch on the BC10 to "1" (On).fig. 27Testing the earth connection circuit of the ionizationelectrode (1)Pin 12855UBA3Pin 81Pin 1KIM81-pole connector16-pole connectorPin 16fig. 28Testing the earth connection circuit of the ionizationelectrode (2)96Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
Actions 88.1.17 Checking the ionization electrode; replace ifnecessary• Switch off the power supply of the heating system on the circuitbreaker.• Set the main switch on the BC10 to "0" (Off).• Remove the casing.• Disconnect the plug and socket connection of the cable.• Set the volt-ohm-multimeter to "Resistance testing".• Test the earth connection circuit of the ionization electrode (seefig. 27). The height of the resistance value must be infinite.• Loosen the fastening screws (see fig. 29, pos. 1).• Remove the earth cable (see fig. 29, pos. 2).• Remove the mounting plate (see fig. 29, pos. 3).• Dismantle the ionization electrode (see fig. 29, pos. 4).• Set the volt-ohm-multimeter to "Resistance measurement".• Test the resistance of the ionization electrode (see fig. 30).The resistance must be 0 Ω.fig. 29Replacing the ionization electrode• Check the ionization electrode for contamination, wear ordamage (see fig. 31).• Replace the ionization electrode if required.• Install a new ionization electrode with a new gasket and securethe mounting plate with the fastening screws.• Fit the earth cable (see fig. 29, pos. 2).• Restore the plug and socket connection.• Fit the casing.• Switch on the power supply of the heating system on the circuitbreaker.• Set the main switch on the BC10 to "1" (On).fig. 30Testing the resistance of the ionization electrodefig. 31Checking the ionization electrodeLogamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications! 97
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Servicing instructionsCondensing ga
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1Safety and general instructions1.8
Page 9 and 10:
Operation 44 Operation4.1 Operating
Page 11 and 12:
Operation 44.2.2 "Service Mode" men
Page 13 and 14:
Operation 4"ADJUSTMENTS" MENU72Curr
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Function 55.2 Structure diagram "Fu
Page 17 and 18:
Function 5page 163The "Hot water mo
Page 19 and 20:
Function 5page 16, page 186The "Hea
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Symptoms 6The following display val
Page 23 and 24:
Symptoms 6zMaine [1/c/\| e [2/1/0|
Page 25 and 26:
Symptoms 6zMaine [a/0/1| e [8/0/0|
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Diagnosis 77 Diagnosis7.1 Faults wi
Page 29 and 30:
Diagnosis 7page 2819Check that ther
Page 31 and 32:
Diagnosis 7No display, part 3page 3
Page 33 and 34:
Diagnosis 7Hot water mode not opera
Page 35 and 36:
Diagnosis 7Repl. AApage 3312Check t
Page 37 and 38:
Diagnosis 7page 3645Check the tank-
Page 39 and 40:
Diagnosis 7page 3415Check the prima
Page 41 and 42:
Diagnosis 7hot water but no central
Page 43 and 44:
Diagnosis 7page 3648Check the DHW c
Page 45 and 46: Diagnosis 7No digital pressure disp
Page 47 and 48: iiliDiagnosis 7Lo0 Y 276The supply
Page 49 and 50: Diagnosis 7Blocking boiler-fault co
Page 51 and 52: Diagnosis 7Locking boiler fault cod
Page 53 and 54: Diagnosis 7Operating code 2U2U 21 3
Page 55 and 56: Diagnosis 7Blocking boiler fault co
Page 69 and 70: Diagnosis 76A Branch 05 v1 v8page 6
Page 71 and 72: Diagnosis 76A Branch 07page 6735Che
Page 79 and 80: Diagnosis 7Operating code 8Y7 L 2 6
Page 83 and 84: Diagnosis 7Replace the UBA44Check t
Page 85 and 86: Actions 88.1.2 External connection
Page 87 and 88: Actions 88.1.4 Checking the fan uni
Page 89 and 90: Actions 8• Remove the air suction
Page 91 and 92: Actions 88.1.8 Replacing the supply
Page 93 and 94: Actions 8• Set the main switch on
Page 95: Actions 8• Switch on the power su
Page 99 and 100: Actions 88.1.20 Checking the gas co
Page 101 and 102: Actions 8fig. 40 Testing the resist
Page 103 and 104: Actions 8• Loosen three screws on
Page 105 and 106: Actions 8• If the boiler does not
Page 107 and 108: Actions 88.1.25 Measuring the inlet
Page 109 and 110: Actions 88.1.27 Measuring the carbo
Page 111 and 112: Actions 8• Pull both plugs on the
Page 113 and 114: Actions 88.1.30 Burner; replacing
Page 115 and 116: Actions 8• Install the new burner
Page 117 and 118: Actions 88.1.34 Heat exchanger; rep
Page 119 and 120: Actions 8• Disconnect the plug an
Page 121 and 122: Actions 8• Remove both the hot su
Page 123 and 124: Actions 8• Loosen the fastening s
Page 125 and 126: Actions 88.1.35 UBA 3; replacing•
Page 127 and 128: Appendix 9Gas orifice diameter Alti
Page 129 and 130: Spare parts 10Pos. Description Prod
Page 131 and 132: Spare parts 10Exploded view Logamax
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Service manual - Logamax plus GB142 (USA/CA) - en - Buderus

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