Any suggestions as to the cause of the following fault.
Hot water is working OK.
Central heating switches on for 10-20 seconds, hot water emerges form heat exchanger into diverter valve and would appear to the enter the CH return side of the CH system (yes the valves are open). Water would just appear to be pumped around the combi `end` of the system. Water gets so hot, gas valve cuts out.
Diverter valve (full) has been replaced, problem persists. CH is also full of crap and would appear to need a good flush, this has been attempted (possibly not completely flushed) but problem still persists.
Any experts with this combi ??
Glenn