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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
8.4 A5 Error (Low Water Pressure)
Error Description
Low water pressure error
Internal pipe pr
essure decrease error
— Internal pressure in pipes <= 4.3PSI error occurs
Checkpoint
Check the input voltage of the pressure sensor
— Color: Red – Black (DC 5 V)
Check the output voltage of the pressure sensor
— Color: White – Black
Check the internal pressure in pipes
Table 27
Figure 16
Check the assembly of the
control board and the pressure
sensor and reassemble them.
Fill the water
Replace the control board
Check the pipes
Internal
pressure in
pipes <=4.3PSI
Check the
pressure sensor
input voltage
Check for any
pipe leakage
No
Ye s
No
Ye s
No
Ye s
Red-Black: 5 V
Replace the control board
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