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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
EO Error - Wire Check
1. Check the connection of the wire.
Figure 55 Control Board
Figure 56 Outdoor Air Sensor
EO Error - Disconnection Check
1. Check if the outdoor air sensor is disconnected.
Figure 57
kΩ
EO Error - Short Circuit Check
1. Check if the outdoor air sensor has short-circuited.
Figure 58
Ω
EO Error - Control Board Check
1. If the wire connection and the resistance of the Hex Thermistor are normal,
replace the control board.
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