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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
8.18 E4 Error (Abnormal Operation: Pressure Sensor)
Error Description
Pressure Sensor Error Error is displayed when the pressure sensor has short-circuited or is disconnected
Checkpoint
Chec
k if the Hot Water Thermistor connector is connected normally.
1. PCB wire
2. Pressure sensor wire
Measure the check the resistance of the pressure sensor (NTC method).
— Separate the sensor and measure it at room temperature.
Check the Pressure sensor for disconnection
Check the Pressure sensor for short-circuit
Table 38
Figure 77
Check the assembly
of the PCB and the mixing
valve connector and
reassemble them.
Assemble the pressure
sensor wire
Replace the pressure
sensor
Pressure sensor
wire is open
Pressure sensor has
short-circuited
No
No
Ye s
Ye s
Red-Black: DC 5 V
Red-Black: DC 5 V
Replace the control board
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