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Is the boiler leaking? If it is then Ideal do a fixed price fix. Have a walk around your radiators and check for leaks.If you find any leaks call a somebody to repair them. Have a look outside and check that the pressure relief pipe isnt leaking. How often do you top up the pressure...

Or if dosed correctly it will look like pee after a heavy session!!!

You need to get the leak fixed first, and without seeing where its leaking from its impossible to say. How long has the boiler been leaking? The leak is causing the pressure loss. Is the hot water going hot and cold at all hot water taps and in the shower? If hot and cold everywhere...

When these boilers first came out there was a problem with F22 faults and it was found to be a board problem. But it would also depend on how old the boiler is as i am talking about the very early models. If its a later one then i doubt it will be the board. Hve you checked and cleaned the...

The resistance of a thermister changes depending on the temperature it is reading. If the boiler has an NTC (negative temperature coefficient) thermister, a good starting point for a reading is 10 Kohm at 25 degrees C. And as the temperature increases the resistance of the thermister will...

Sounds like you are getting good advice. I have worked for two manufacterers and one of the most common call outs for combi's with poor hot water and heating performance is due to undersized pipework. Regards.

I hope BG have diagnosed the fault properly. Water can get onto pcb 37 because of a heat exchanger leak but more commonly it can happen if an inner flue seal has deteriorated. The condense then runs down the outside of the heat exchanger and onto the components that you have mentioned. I...

Is the water dripping from the boiler casing? If so you will have a water leak inside the boiler. If your boiler isnt firing then it will not be condensing, so my thought is that you have a water leak, and the water is dropping onto the pilot and burner assembly. Hope its not a main heat...

There is no auto air vent on an Icos. (Auot air vents are only fitted onto Icos systems and Isar's) Are there any water marks on top of the burner or on the fan? Are there water marks around the air intake of the flue (inside the boiler)? Any water marks around these areas normally...

What heat output does your heating system have? If the output is above 18 KW, the flow and return pipework should be increased to 28mm (central heating design spec). Regards.

Could be a number of problems. You say the boiler and pump were changed, what about the radiators, pipework etc? Was a heat loss calculation and radiator sizing method done during the installation? A very dirty system will give you poor circulation as will undersized system pipework...

Most common reasons for H9 & L9. Check system pressure. Check pump. Check that teh temp diff doesnt exceed 20 degrees C. Make sure that any 'bypass' on the heating system is open and set up correctly. If the uncontrolled radiator is turned off (both llocksheilds off) it will cause...

Nobody should adjust the gas valves on these boilers. I would definately go with gas valve replacement if the gas injestor/ venturi in the fan is clear. Regards.

Hi Are other gas appliances in the house working (hob,fire etc)? If these other appliances are not working then it would suggest that your problem lies with the gas supply. If they are working then you will need to call somebody out as it could be a number of different things (fualty...