The following table or page contains the information required to help repair and diagnose the fault codes being shown on the boiler display. You may be guided through the fault finding sequence or steps, for rectifying your boiler with this fault code. Suggested repair solutions may be provided by a link to a repair page. NB Some fault codes are only applicable to a specific range of boilers only.
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I have a Vaillant Ecotec and when recently serviced the gas inlet pressure when on full demand was The service engineer put this down to the pipe size being only 22mm, whereas he felt it should be 28mm. However he did also note the pressure at the meter when the boiler was on full demand was only registering 17mb. This service engineer was not the same company that did the original installation, but when I spoke to the original engineer about this he indicated that when the boiler was commissioned it was fine.
In fact he said that the previous boiler, which was situated about 4 feet away from the new one had old 18mm pipework and that was OK. He was right and I checked the service report on this and it was showing He suggested I get the gas pressure looked at coming into the meter before any work was undertaken.
He even suggested that I should get the pipework changed first and then if there was still a problem I should call in National Grid! I therefore used this site to increase my knowledge of gas pressures and discovered that National Grid are obliged FOC to ensure that pressure at the meter should be between 19 and 23mb boiler on full demand.
I therefore called them out before I undertook any remedial work on my pipework and they cleared a blockage and changed the gas governor. What I have learned from this is that my service engineer was far too quick to assume that the pipework from meter to boiler was defective. National Grid are more than willing to come out and look at things and makes some tweeks and this costs absolutely nothing at all. In fact I also learned that the gas pressure at the meter varies during the time of the day and the weather.
The colder the weather the more people that are using their boilers and the lower the pressure at the meter. Er go, the lower the pressure at the boiler. Having said that, if I knew that 28mm pipework was standard when the central heating system was being installed then I would have said something, but you do rely upon the knowledge of the engineer and his experience.
I hope this helps someone else in a similar position.
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