posted by
emperor at 02:42pm on 11/11/2008
Those of you who have visited our house will know that it can get a little cold downstairs, due to a lack of radiators in the back of the house. We have gas central heating, but often need to light one or two of the gas fires to heat e.g. the sitting room.
Recently, we've been noticing that the gas fire in the sitting room has been going out (the one in the back room does too, but that's a more enclosed fire which vents to the outside directly). What seems to happen is that the pilot flame is too small, so doesn't heat the thermostat sufficiently, so the gas supply gets cut off. Turning the boiler on and off noticably affects the size of the pilot flame. I've yet to note the fire going out when the boiler wasn't running.
This morning, I could run the boiler and the fire OK, but it doesn't seem to work so well in the evening. Is this likely to be because there's a faulty gas supply to the house (that can't supply enough pressure to the various appliances), that the fires which go out are maladjusted, that the boiler is maladjusted, that it's just one of those things we'll have to put up with, or that it's something we should reasonably expect to be fixable?
FWIW, we have 3 gas fires (one of which I think has no thermal cut-out), a gas cooker, and a gas combi-boiler.
ETA: in response to a couple of comments, we had a gas safety certificate done when we moved in (March time), and we do have a CO alarm, which isn't complaining. When the fire is on it seems to be burning fine, and it doesn't leak gas when the pilot's gone out.
Recently, we've been noticing that the gas fire in the sitting room has been going out (the one in the back room does too, but that's a more enclosed fire which vents to the outside directly). What seems to happen is that the pilot flame is too small, so doesn't heat the thermostat sufficiently, so the gas supply gets cut off. Turning the boiler on and off noticably affects the size of the pilot flame. I've yet to note the fire going out when the boiler wasn't running.
This morning, I could run the boiler and the fire OK, but it doesn't seem to work so well in the evening. Is this likely to be because there's a faulty gas supply to the house (that can't supply enough pressure to the various appliances), that the fires which go out are maladjusted, that the boiler is maladjusted, that it's just one of those things we'll have to put up with, or that it's something we should reasonably expect to be fixable?
FWIW, we have 3 gas fires (one of which I think has no thermal cut-out), a gas cooker, and a gas combi-boiler.
ETA: in response to a couple of comments, we had a gas safety certificate done when we moved in (March time), and we do have a CO alarm, which isn't complaining. When the fire is on it seems to be burning fine, and it doesn't leak gas when the pilot's gone out.
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If you're renting, your landlord should have all the gas appliances serviced every year and provide you with a copy of the proper certificates. This is a legal requirement.
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It does seem to still burn OK, but when the boiler comes on, the flame in the fire shrinks, like there isn't enough pressure.
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Either way, if the main burner gas flow is stopped with the pilot flame extinguished, then the capability for the building to fill with gas is limited, though there would be some risk in a small room with no ventillation. If the pilot flame gas supply is also stopped if the flame is extinguished, as is the case with all boilers I have seen, then there wuld not seem to be a means for this fault to cause danger as it stands.
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Even if it's just the gas tap not fully on, it's still worth getting National Grid out to check, because they will come quickly owing to the possibility of boomage.
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I had mine done three weeks ago and I noticed that the letter said that they needed access to the house even if the meter was outside. I didn't follow up why on that as mine is inside. I made use of my retired father to housesit for the day.
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If the jet for the pilot flame is accessible, it would be worth using a vacuum cleaner and a small brush to make sure it is thoroughly clean. I have seen detritus cause this sort of a problem.
Otherwise, a gas repairer is needed. Likely causes would be that the thermocouple (or whatever other gadget detects the presence of the flame) that has begun to fail, or the gas feed to the flame itself could be incorrect. Assuming that there is not a performance about having to go away and get the right part, a properly trained corgi should be able to solve the problem quickly.