Buderus Logamax plus GB142-24 Servicing Instructions page 42

7 Diagnosis
Hot water but no central heating continued -2
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20
Check that the DHW circulation pump is
running, as described for the primary
circulation pump.
Is the
DHW circulation pump running?
Check that during heating mode there is a
120V AC voltage on the DHW circulation
pump.
Is there a
voltage?
Check the connection board to make sure that
there is 120V AC on both contacts L and N
of connection PS (green) during heating
mode.
Is
there a voltage?
Check the cable loom of
the device.
Is the cable loom
okay?
Replace the connection board.
Is the DHW circulation
pump running?
44
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42 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
Yes
No
Yes
No
Yes
No
No
Yes
Yes
No
48
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49
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Replace the supply cord of
the tank-filling pump.
Replace the
cable loom.
8
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