Heating circuit filling time longer than 10 minutes.
1. Check that the heating pressure switch setting pressure, FILL appears when the pressure drops below 8.7 psi (0,6 bar), and disappears when the pressure rises above 22 psi (1.5 bar). If the heating pressure switch is not correctly set, it must be replaced.
2. Check that there are no water leaks in the heating system. If the system has a leak, it must be fixed.
