just moved in to new'ish place, wall stat drayton does'nt click when heating on, water not getting very hot although radiators with stats working ok, temp and water set ok. 5 valves 4 isolating cocks underneath boiler any idea what position they should be in ?

a) HEATING FLOW
b) DOMESTIC HOT WATER OUTLET (24ci Only)
c) GAS SERVICE COCK
d) COLD WATER INLET (24ci Only)
e) HEATING RETURN