Over heat limit stat on central heating circuit ? if hot water is ok and hot to temp when run for 5 minutes the expansion vessel is doing its job.remember hot water is the maximum demand for any boiler ,,heating is secondry?once you establish hot water at maximum rate then the only real problem is on you demand for heating??
SOURCE: worcester oil heatslave boiler pressure rises to over 3 bar when
iif you,ve tried everythng change gauge
SOURCE: heating, but no hot water on a vaillant turbomax 28 combi
the problem is the diverter valve unit, source a corgi engineer to fit new one, cost for valve approx 80 quid +fitting
Kindly
Richie
SOURCE: gas central heating boiler. insuffient water pressure.
u need to have a key (its like a T shape key) and u put that under the boiler its a hole in there, than u open the tap which is near this hole.
SOURCE: Ariston Combi euro boiler SX20 MFFICE 970903039 GC No 4711602
have you tried to put some cleaner into the system it siounds like you may have a circulation problem
SOURCE: Ariston ACO MFFI 35 E34 fault code present
This is the manual for your boiler. I hope the information contained in the manual will help you identify your problem.
http://www.ariston.co.uk/uploads/doc47e92b04013d8.pdf
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