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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
Table of Contents
1 Key to Symbols and Safety Instructions 4
1.1 Key to Symbols 4
1.2 Safety 4
2 Key Components 6
3 Technical Data 8
4 Dimensions 9
5 Setting the DIP Switches 10
6 Wiring Diagram 11
7 Key Components Description 12
7.1 Pump 12
7.2 Turn Down Ratio (TDR) Solenoid valve 12
7.3 Orifi ce 13
7.4 Fan 13
7.6 High Limit Cutout HEX T2 (302°F) 14
7.7 High Limit Cutout Supply T3 (203°F) 14
7.8 Primary Heat Exchanger 14
7.9 Secondary Heat Exchanger 15
7.10 Sensor 15
7.11 Electrode 16
7.12 Flame Rod 16
7.13 Ignition Transformer & Wire 16
7.14 Burner 17
7.15 Gas Valve 17
7.16 Touch Pad 17
7.17 Control Board 18
7.18 Condensate Trap Assembly 18
7.19 Air Pressure Switch 18
8 Troubleshooting 19
8.1 A2 Error (Abnormal Operation: Fan) 19
8.2 A3 Error (Abnormal Operation: Pump) 21
8.3 A4 Error (Overheating of Heat Exchanger) 23
8.4 A5 Error (Low Water Pressure) 25
8.5 A6 Error (Ignition Error) 27
8.6 A7 Error (Abnormal Operation: Gas Valve Relay) 29
8.7 A8 Error (Abnormal Operation: Gas Valve) 29
8.8 A9 Error (Exhaust Temperature Sensor Error) 31
8.9 AA Error (Overheating) 33
8.10
AB Error (Abnormal Operation: Heat Exchanger Temperature Sensor 34
8.11 AC Error (Abnormal Operation: DHW Sensor) 36
8.12 AD Error (Clog of Condensate Trap) 38
8.13 AE Error (Blockage of Flue Pipe) 40
8.14 EO Error (Abnormal Operation: Outdoor Temperature Sensor) 42
8.15 E1 Error (Abnormal Operation: Exhaust Temperature Sensor) 44
8.16 E2 Error (Exhaust Temperature Overheating) 46
8.17 E3 Error (Abnormal Operation: Return Sensor) 48
8.18 E4 Error (Abnormal Operation: Pressure Sensor) 50
8.19 E7 Error (Abnormal Operation: Gas Valve Relay) 52
8.20 EB Error (Hot Water Overheating) 52
9 Components Replacement Instructions 54
9.1 Preparation Step 54
9.2 Control Board 55
9.3 Sensor, Heating/Return 55
9.4 Sensor, DHW 55
9.5 Exhaust Temperature Sensor_T4 (Blue) 55
9.6 Gas Orifi ce 56
9.7 Air Pressure Switch 56
9.8 Gas Valve 57
9.9 High Limit Cutout HEX T2 (302°F) 57
9.10 High Limit Cutout Supply T3 (203°F) 57
9.11 Ignition Transformer 57
9.12 Electrode Assembly 58
9.13 Flame Rod 58
9.14 Touch pad 59
9.15 Condensation Trap 59
9.16 Turbo Fan 60
9.17 Solenoid Valve 61
9.18 Heat Exchanger 62
10 Flushing the Heat Exchanger 65
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