Bosch Singular 5200 Service Manual

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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
AC Error - Wire Check
1. Check the connection of the wire.
Figure 42 Control Board
Figure 43 DHW Sensor
AC Error - DHW Sensor Check
1. Measure the resistance of the DHW sensor. If the resistance is not normal,
replace the DHW sensor.
— Disconnection: OL
— Normal: 86 °F: 40 kΩ
140 °F: 12.4 kΩ
185 °F: 3.9 kΩ
Figure 44
KΩ
AC Error - Disconnection Check
1. Check if the sensor is disconnected.
— Disconnection: OL
— Normal: 86 °F: 40 kΩ
140 °F: 12.4 kΩ
185 °F: 3.9 kΩ
Figure 45
kΩ
AC Error - Short Circuit Check
1. Check if the DHW sensor has short-circuited.
— Short circuit: 0 Ω
— Normal: 86 °F: 40 kΩ
140 °F: 12.4 kΩ
185 °F: 3.9 kΩ
Figure 46
Ω
AC Error - Control Board Check
1. If the wire connection and the resistance of the DHW Thermistor are normal,
replace the control board.

Bosch Singular 5200 Specifications

General

Brand	Bosch
Model	Singular 5200
Category	Boiler
Language	English