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46 | Spare parts222222222222221213221213654131113172521 1 16811141915183 27142022262822226 720 805 218-56.1TFig. 40 Spare parts SB745WS-800/1050/1300/15506 720 805 218 (2013/02)SB625WS/SB745WS
Troubleshooting | 4710 TroubleshootingProblem Cause TroubleshootingThe boiler does not reach its set temperature. Heat exchanger dirty. ▶Clean the flue gas pipes.Heat exchanger and burner mismatched. ▶ Check specifications and settings.Insufficient gas flow burner.▶ Check and adjust the burner.Control thermostat problem.▶ Check the functioning of the aquastat.▶ Check the temperature setting.The boiler keeps shutting down, and the controlpanel warning light comes on.The boiler has reached the set temperature butthe radiators are still cold.Control thermostat problem.No water supply.Air in the circuit.Air in the circuit.▶ Check the functioning of the aquastat.▶ Check the temperature setting.▶ Check the electrical wiring.▶ Check the sensor bulbs.▶ Check the circuit pressure.▶ Check the vent valve.▶ Bleed the circuit.Pump malfunctioning.▶ Check/release the pump.Problem with minimum temperature aquastat (if ▶ Check the temperature setting.present).There is a smell of fumes. Fumes are escaping into the air. ▶ Check that the boiler body is clean.▶ Check that the flue pipes are clean.▶ Check that the boiler, flue pipes and flue gasexhaust stack are all properly sealed.The safety valve keeps opening. Excessive pressure in the circuit. ▶ Check the circuit pressure.▶ Check the functioning of the pressurereducer.▶ Check the settings of the pressure reducer.Problem with heating system expansion vessel. ▶ Check the efficiency of the expansion vessel.There are traces of condensate on the rear head. Flue gas box seals.▶ Check the seals between the rear head andthe flue gas box.Table 21 TroubleshootingSB625WS/SB745WS6 720 805 218 (2013/02)
Page 1 and 2: UPON COMPLETION OF THE INSTALLATION
Page 3 and 4: Key to symbols and safety instructi
Page 5 and 6: Product Description | 52 Product De
Page 7 and 8: Product Description | 7secure the s
Page 9 and 10: Product Description | 92.9 Dimensio
Page 11 and 12: HHProduct Description | 112.9.3 Wat
Page 13 and 14: Water treatment | 133 Water treatme
Page 15 and 16: Water treatment | 15In particular:
Page 17 and 18: Installation | 175 Installation5.1
Page 19 and 20: Installation | 19213174181965781691
Page 21 and 22: Installation | 21▶ Insert a wrenc
Page 23 and 24: Installation | 235.3.2 Removing the
Page 25 and 26: Installation | 255.6 Venting Requir
Page 27 and 28: Installation | 2712Fig. 24 Neutrali
Page 29 and 30: Commissioning | 29Example DHW deman
Page 31 and 32: Commissioning | 31▶ Insert the te
Page 33 and 34: Commissioning | 336.11 Commissionin
Page 35 and 36: Inspection and maintenance | 358 In
Page 37 and 38: Inspection and maintenance | 37▶I
Page 39 and 40: Inspection and maintenance | 39Conf
Page 41 and 42: Spare parts | 41222222221213 172213
Page 43 and 44: Spare parts | 432222222222121313111
Page 45: Spare parts | 45Item no. Article nu
Page 49 and 50: Glossary | 4912 GlossaryAppearanceT
Page 51: | 51NotesSB625WS/SB745WS6 720 805 2

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