FINALLY MANAGER TO FIX THIS PROBLEM FAULT E34. Turn the boiler off, unscrew the flue where it meets the boiler, take out metal ring marked 43mm. this is an installation fault not a fault with the boiler. The 43mm ring is only supposed to be fitted where the flue is longer than 2 or 3 feet, short flues don't need it. Also I have just emptied condensate trap at the bottom of the unit on the left hand side. BOILER IS RUNNING FINE FOR A WEEK NOW. NO MORE ERROR E34.
Take machine out of power.
open the top cover
you can see the heatting element now (its on the metal unit on the right to the brick)
the heating scensore is the one that is locate in the middle you got the heattin element with cord each side then in the middle you got 2 thermostats (that can go bad also) and in the middle the heat thermostat.
Airswitch is faulty
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