Technical data

53
Does yellow hot water demand indicator ( ) glow?
Check hot water flow rate and temperature. Compare with techncal data. The max. temperature increase is obtained with D.H.W. thermostat on position 9. If flow rate is not sufficient, check imcoming main water supply.
Normal operation carry out electrical safety checks (see section 5.1 preliminary electrical checks).
Check D.H.W. operation
Sheet J
Does actuating lever operate D.H.W. microswitch on diverter valve/water section assembly?
Check cold water inlet pressure is sufficient. Check filter in cold water inlet is clean. Check cold water isolating valve (3, fig. 50) is fully opened (turn anticlockwise). Does lever move now?
Yes
No
Draw hot water at high rate.
Check/replace D.H.W. microswitch.
Check/clean diaphragm and venturi in the bottom part of the diverter valve/water section, replace as necessary.
Replace diverter section.
No
No No
Yes
Yes Yes