Bosch Singular 5200 Service Manual

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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
AB Error - Wire Check
1. Check the connection of the wire.
Figure 35 Control Board
Figure 36 Heating Water Sensor
AB Error - Heating Water Sensor Check
1. If the resistance is not normal, replace the Heating water sensor.
— Disconnection: OL
— Normal: 86 °F: 40 kΩ
140 °F: 12.4 kΩ
185 °F: 3.9 kΩ
Figure 37
KΩ
AB Error - Disconnection Check
1. Check if the heat exchanger overheat sensor is disconnected.
— Disconnection: OL
— Normal: 86 °F: 40 kΩ
140 °F: 12.4 kΩ
185 °F: 3.9 kΩ
Figure 38
kΩ
AB Error - Short Circuit Check
1. Check if the Heating water sensor has short-circuited.
— Short circuit: 0 Ω
— Normal: 86 °F: 40 kΩ
140 °F: 12.4 kΩ
185 °F: 3.9 kΩ
Figure 39
Ω
AB Error - Control Board Check
1. If the wire connection and the resistance of the heat exchanger overheat
sensor are normal, replace the control board.

Bosch Singular 5200 Specifications

General

Brand	Bosch
Model	Singular 5200
Category	Boiler
Language	English