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Troubleshooting | 45
6 720 805 218 (2016/02)SB625WS/SB745WS
10 Troubleshooting
Problem Cause Troubleshooting
The 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 control
panel warning light comes on.
Control thermostat problem. Check the functioning of the aquastat.
Check the temperature setting.
Check the electrical wiring.
Check the sensor bulbs.
No water supply. Check the circuit pressure.
Air in the circuit. Check the vent valve.
The boiler has reached the set temperature but
the radiators are still cold.
Air in the circuit. Bleed the circuit.
Pump malfunctioning. Check/release the pump.
Problem with minimum temperature aquastat (if
present).
Check the temperature setting.
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 gas
exhaust stack are all properly sealed.
The safety valve keeps opening. Excessive pressure in the circuit. Check the circuit pressure.
Check the functioning of the pressure
reducer.
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 and
the flue gas box.
Table 22 Troubleshooting
45


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