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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
8.2 A3 Error (Abnormal Operation: Pump)
Error Description
Abnormal Pump Operation
Det
ermine whether the pump is in operation when the boiler operation signal is activated
Before operating the pump, check the change in the pressure sensor before and after to see whether there are any
problems in the operation of the pump.
Checkpoint
Check the assembly of the pump connector
Check the operation voltage of the pump
— Color: White – Black
Check for any clogging of heating water pipes
Table 25
Figure 10
Check the assembly of the
control board and the pump
connector and reassemble
them. Check the operation
of the pump and the flow of
heating water.
Replace the control board
Replace the pump
Power ON / Operation
Check for any clogging of
heating pipes
Check the
pump input
voltage
Whether
the pump is
running
Check for any
clogging of
heating pipes
Ye s
Ye s
Ye s
No
No
No
White-Black: AC 100
120 V
Replace the control board
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