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i have no hot water or only warm water i have changed the diverter valve i have also changed the dhw heat exchanger any one out there have any ideas as its becoming a nightmare now .could it be a thermostat or electric problem its a valliant ecomax 824 thanks

hi ive had the above boiler for aprox 3 years recently when running hot water .it goes hot then drops to warm only on reseting boiler does it go hot again for a short while then goes warm to cold looking at fault codes it says f25 althouth i cant finf 25 in manual any help .ill be gratful...