Bosch Singular 4000 Service Manual page 32
Gas condensing combi boilers
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Also See for Singular 4000:
- Installation instructions manual (68 pages) ,
- User manual (20 pages)
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Service Manual
A9 Error - Wire Check
1. Check if the heating water sensor connector is disconnected
Figure 29
A9 Error - Exhaust Temperature Sensor Check
1. Check if the heating water sensor is defective
Defective: OL
—
Normal: 86 °F: 40 kΩ
—
140 °F: 12.4 kΩ
185 °F: 3.9 kΩ
Figure 30
3 2 |
kΩ
Singular Combi Boiler - BTC 439002301 A (12.2021)
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