Filling loop is underneath the boiler, easily identified as a chrome coloured braided pipe with a black tap at either end. Open right hand tap first then left hand one . Fill system till presure gauge reads just over 1 bar when system is cold. Then turn both taps off.
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when was it last serviced?dirt may be a factor,there are many parts that cause this fault in the microgenus so you need someone familer with the product parts playing up could be1.airswitch2motor3flowgroup4ntc you havent mentioned if it needs re-setting
Many boilers seem to use a more or less common type of thermister although actual fixings vary. My experience of one of these from another brand of boiler was 670 ohms at 10 deg C and 10 -11 k ohms at 20 deg C
The leak is coming from a seal around the pin that the motor acts upon, the seal does not come as a replaceable part on its own, so the whole flow group as it is called will need to be replaced, approximate price 170 to 200 pounds inc vat, makers part no 998613. plus 2 or 3 hours labour of a corgi registered engineer. If your boiler is more than 6 years old and you have not had to replace the fan or other parts yet, then think about getting a new high efficiency boiler, it could be a better long term solution.
im an engineer and recently had exactly the same thing with this ariston boiler, i found out it was the the 'air pressure switch', this is a switch which is part of the ignition, it works in conjuction with the fan. when the boiler fires up the air pressure switch makes, if its faulty it can break the circuit mid flow and cause the burner to shut down therefore giving intermittent hot water and heating, theres a possibility that the aps tubes may be damaged as well so ensure they'e condition is good. hope this helps you
sounds like your diverter valve is passing on the boiler, this diverts the heat either to the rads or to the taps, if its passing through the heating chanel it'll heat up the rads- may also be a scaled up secondary heat exchanger, hope this helps you
the boiler reqs to be pressurised to 1 bar in a cold state, in operation the heat expansion with cause the gauge to rise by about half a bar so in full working mode with heating on you'll expext the gauge to register around 1 1/2 bar-