ARISTON MICRO GENIUS 23 MFFI Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[Brows]

When trying to run hot water the flu light comes on and the water stays cold. If i move one of the joint 3 plastic pipes from the airflow switch and put my finger over one of the pipes it fires up. But as soon as I connect back to the airflow switich then flame goes out and water goes cold.

Could it be a faulty air switch or could it be a faulty flu has this only happens when it rains heavely.

[wishiwascorgi]

you can pick an air pressure switch up for about £20 so it would be worth trying first. If not then there could be a blockage in your flue. What type of flue is it?

[toneyt]

does the flue elbow have a venturi in it as thes can block

[plumbers1]

Venturi vent tube in flue needs checking for dust or blockage (blow through it and clean. If not this then air pressure switch about £25.00