Hi My Ariston Microgenus Combi will fire up, and shut down after 10 secs...red light comes on.
This is true for Hot Water... or C/Heating.
It is sometimes slow to " register" and fire up.
Water Pressure fine.
Replaced Temp sensor and overheat sensor.
The " flame safety device" in the gas burner appears well placed in the flames
All visible connections seem fine.
Any suggestions ?
Regards, Bill

Bill, April 2010