Bosch Singular 5200 Service Manual

| 49
Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
E3 Error - Wire Check
1. Check the connection of the wire.
Figure 72 Control Board
Figure 73 Return Sensor
E3 Error - Return Sensor Check
1. Measure the resistance of the Return sensor. If the resistance is not normal,
replace the Return sensor.
— Disconnection: OL
— Normal: 86 °F: 40 kΩ
140 °F: 12.4 kΩ
185 °F: 3.9 kΩ
Figure 74
KΩ
E3 Error - Disconnection Check
1. Check if the Hot Water Thermistor is disconnected.
— Disconnection: OL
— Normal: 86 °F: 40 kΩ
140 °F: 12.4 kΩ
185 °F: 3.9 kΩ
Figure 75
kΩ
E3 Error - Short Circuit Check
1. Check if the Return sensor has short-circuited.
— Short circuit: 0 Ω
— Normal: 86 °F: 40 kΩ
140 °F: 12.4 kΩ
185 °F: 3.9 kΩ
Figure 76
Ω
E3 Error - Control Board Check
1. If the wire connection and the resistance of the Hot Water Thermistor are
normal, replace the control board.

Bosch Singular 5200 Specifications

General

Brand	Bosch
Model	Singular 5200
Category	Boiler
Language	English