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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
8.19 E7 Error (Abnormal Operation: Gas Valve Relay)
Error Description
Gas valve relay error It occurs when the gas valve relay which is mounted on control board is stuck closed.
Checkpoint Replace the contr
ol board
Table 39
8.20 EB Error (Hot Water Overheating)
Error Description
Overheating of temperature sensor
(Boiling superheat) ov
er 176 °F
An error is displayed when abnormal overheating caused by Hot water sensor
Checkpoint
Check the resistance of Temperature sensor (NTC method)
— Measurement should be carried out after separating the sensor.
Table 40
Figure 81
An error occurs when the
water temperature is 176 °F
(80 °C) or below
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
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