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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
AE Error - Wire Check
1. Check the connection of the air pressure switch and the wire.
Figure 51 Control Board
Figure 52 Air Pressure Switch Wire
AE Error - Air Pressure Switch Check
1. Check the air pressure switch for abnormalities under combustion stop
condition.
— Normal: under 1Ω
— Abnormal: O.L
Figure 53
Ω
2. Operate the water heater using hot water over 4GPM and check the air
pressure switch for abnormalities when the fan spins at the maximum speed.
— Normal: 0.L
— Abnormal: under 1Ω
3. Replace the air pressure switch if the resistance is abnormal.
AE Error - Foreign Material Check
1. Check for any restrictions or blockage in the venting system.
— Remove foreign material if present.
AE Error - Control Board Check
1. Replace the control board if the connection of air pressure switch and the
resistance are normal and no foreign material is present in the air inlet and
outlet.
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