Boiler still cutting out?

Joined
6 Feb 2012
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Location
Hertfordshire
Country
United Kingdom
We have an Ideal mini C28 that has been serviced regularly from its installation app 5-6 years ago, it has no external controls, its had a new expansion vessel app 2 year ago and the pressure is always app 1.5 bar?
My ongoing problem is that boiler ignites ok either manually or by program but after a period of time the flame cuts out leaving the fan running, so far we've have had the CH/NTC sensor changed, the fan,venturi,injectors and burner cleaned and just had the overheat thermistor/sensor changed but the problem still persists!
im a sparks so seeing the removed overheat sensor was left on top of the boiler ive tested it with my insulation resistance/low reading ohm meter and the sensor gives a reading of 0.10 ohms?
Anyone got any advise on what i should do next? its driving me nuts with an 18 mth old baby girl and a missus in the house! :cry:
 
When the boiler fails, you need to remove the pcb cover and flick no4 dip switch down. This sets the boiler into diagnostic mode and you will see what the fault is by why led's are on or flashing.
 

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