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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
8.9 AA Error (Overheating)
Error Description
Overheating of temperature
sensor (Boiling superheat)
ov
er 208 °F
An error is displayed when abnormal overheating caused by heating water sensor
Checkpoint
Check the resistance of Heating water sensor (NTC method)
(Measurement should be carried out after separating the sensor)
Table 31
Figure 31
An error occurs when the
water temperature is 208 °F
(98 °C) or above
Replace the temperature
sensor
Check the resistance of the
temperature sensor
Resistance
<= 3.5 kΩ
Ye s
No
86 °F: 40 kΩ (± error possible)
140 °F: 12.4 kΩ
185 °F: 3.9 kΩ
Replace the control board
AA Error - T2 Temperature Resistance Check
1. Check if the resistance matches the temperature on the following
temperature resistance values:
— 86 °F: 7.05 kΩ
— 140 °F: 2.5 kΩ
— 201 °F: 952 Ω
Figure 32
KΩ
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