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All I know is thats what the engineer told me, as far as i could see (i like to stand and watch) he removed the fan took it outside gave it a good blow out with a mini compressor and then re-fitted it, its been running fine ever since, apparently its a very common problem on the 820 and he made...

Just thought id let you all know my boiler s now fixed. Had a local boiler engineer come have a look at it and he fixed it in about 10 mins, apparently the pipes that lead from the fan to the air pressure sensor were clogged up with fluff and dust causing it to cut out, gave it a good blow out...

Sorry , didnt realise a****d was considered bad language, what make and model would you reccomend I go for as the 820 has never worked very well with my thermostatic shower mixer, am I right in saying I need a fully modulating boiler and not a step modulated one if I want the shower to work...

low gas pressure is set at 1.5mbar high is around 8.1mbar. Seems to be taking its time firing up the burner when I open the tap now, im sure it used to be instant. Wonder if the diaphragm has gone again (only been in about 8 months). To be honest ive just about had enough of it and am...

So far ive changed the thermocouple cut off thermostat and the high limit thermostat and its still doing it, i suppose the pump is the next logical step, dont really want to fork out for a new pump if it turns out to be the heat exchanger thats clogged up/warped/knackered, if heat exchanger gone...

Pump seems to be fine (very quiet) , do you mean flow of ch water through heat exchanger, the problem seems to be whatever controls the step modulation of the boiler, sometimes it steps down to low burn but most of the time it just cuts the burner, if i slowly turn down the dhw stat till it...

Already changed it. Its a gainsborough that uses the aqualise pink combi cartridge. Hot water doesnt seem to go off when i open a tap but i suspect thats because it never gets up to temp as the flow rate is set quite high, i have to turn taps down to get really hot water but i like it like that...

Been having a problem with my ravenheat 820 for quite a while now, changed the diaphragm a while ago as couldnt get dhw without heating on so thats not the problem. Problem is the burner doesnt seem to modulate correctly, seems to be more of a problem with the shower , turn on shower water gets...