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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
7.17 Control Board
Part No.
7738007249 (Singular 5200)
7738007248 (Singular 4000)
Function
To control each component and performance of unit.
Failure Event
Malfunction of control board.
Unit does not operate.
Effects
A component does not operate within the unit.
In case of the control board failure, the water heater does not
operate.
Error Code
—
Diagnostic
Visual inspection: Connection or breakage of water or burn marks on the
control board.
Color/Number of Wires
N/A
Table 20
7.18 Condensate Trap Assembly
Part No.
7738007273
Function
Drain condensation, which is created while combusting.
Failure Event
Fail to drain condensation caused by clogged trap.
Condensation leakage into the unit.
Effects
Stop combustion.
Condensation leakage.
Error Code
AD
Diagnostic
Visual inspection: Connection or breakage of wires, check for
physical damage to the trap body.
Voltage Check: Check range of voltage shown below.
Color/Number of Wires
Green-Red: AC 24 V
Table 21
7.19 Air Pressure Switch
Part No.
7738007247 (Singular 5200)
7738007246 (Singular 4000)
Function
Prevents operation of the unit due to unsafe condition. Back pressure or
blockage has occurred in the exhaust vent.
Failure Event
No operation of the unit.
Effects
Stop combustion.
No operation of the unit.
Error Code
AE
Diagnostic
Visual inspection: Connection or breakage of wires.
Voltage check: Check range of voltage shown below.
Color/Number of Wires
Green-Green: DC 5 V
Table 22
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