We've had a gas central heating system for about 8 years now and it's
never been serviced.
The missus is getting a bit worried (speaking to the neighbours) that
it's a bit dangerous to leave it as long.
I think that an annual service is unneccessary and we should only
bother to get it fixed if something goes wrong.
What is the point of a service ?
Any comments welcome.
A lot depends on the type of boiler. Some old boilers tend to soot up and
need cleaning out regularly. Some new hi-tech boilers need regular checking
and adjustment to keep them working efficiently. The rest run for ever
without being touched. If yours is one of those, "if it ain't broke, don't
fix it" is a good maxim.
The trick is in determining which sort you've got!
I've just had a look and it's a -
Worcester Bosch 24CDi COMBI boiler.
The thing is the missus got this local handyman to do some work around
the house (he made a pretty good job of it) but told her he has
friends & family for all our needs.
I'm one to wait until something needs fixing because I'm sure you
waste money on insurance etc.
Any other comments welcome.
On Sun, 06 Dec 2009 20:11:56 +0000, Victor Meldrew wrote:
That's what Roger so succinctly described as an "aint't broke/don't fix"
type. As long as it's room-sealed (I don't think there were any
conventional flue CDi-s, though I know there were of other W-B boilers of
this period) I wouldn't expect it to need attention until something or
other (e.g. the fan or diverter valve) packs up.
While we are on this subject would anyone care to comment on the
Potterton PrimaF LPG boiler, mine hasn't been serviced since it was
installed 10 years ago. It seems generally happy, flame looks as it
always has, very occasionally recently it has failed to fire up, pilot
light comes on but that is all. Give it a 2nd chance and its OK, I'm
suspecting the thermocouple that detects the pilot but as it hasn't
become a major problem it has been left alone.
Yeah, I've never looked at mine (28i Junior) - installed just before the
efficiency regs came in
There is no thermocouple, it has electronic flame sensing
Your problem is either
the HT lead having broken (and yes it will still spark)
the HT electrode not quite being in the flame
Thanks for that Geoff, the pilot is OK but it doesn't always turn the
gas on to the main burner so it just sits there with the pilot burning,
no idea for how long, is there a watchdog on it that would reset and try
again or does it just sit there?. But I now know I don't need to look
for a thermocouple. I have a general circuit somewhere but not sure it
goes into detail on the PCB, having spent 30 years repairing
electronics I hate to be a "board changer" much prefer to replace
components. Cheaper too :-)
Especially from me
but ... I was slightly too hasty there, the question is whether the
spark keeps going or not when the pilot is alight
If it stops, then the pcb has sensed that the pilot is alight, if not,
if it stops sparking then its pcb or loom to the main valve or main
Apparently BG did some data mining, and discovered that they are better off
only touching gas boilers when they go wrong. So that's exactly what they
do on their service contracts, they run the boiler, sample the flue gasses
for CO? C02? (I'm not sure) and only take the cover off if the readings are
out of spec.
If you really want to DIY I suppose you could get a meter and do the same,
calling in a service man only when there's a problem. After all if it's
running fine, as determined by the output gasses then there's nothing to do.
The Glowworm Galaxie back-boiler here has just celebrated its
The only things that have ever gone wrong with it happened during
servicing by BGas.
The last time they came, seven years ago, the chap held a smoke candle
to the top grille on the gasfire, and despite his best attempts got a
huge amount of draft to take the smoke away.
I forebore to tell him that we live on the top of a hill, and even on
a day that appears still, you can hear the pilot light guttering in
the chimney draught. I also didn't mention to this chap that the air
inlet for the boiler is at the bottom, behind a removable fascia.
For some reason, I've never asked them back, and the boiler hasn't
been 'serviced' since.
On Mon, 07 Dec 2009 16:18:12 +0000, Terry Fields wrote:
If that's the model I think it is that last one I saw was so sooted up I
was surprised the owners were still alive.
Tell me you've at least got an electronic CO alarm at a suitable position
in the room to warn you when lack of cleaning eventually catches up with
the beast and it starts spewing out CO into the room?
Open/conventional-flued boilers are the one type I really do recommend
really servicing annually or thereabouts.
Yes, two in fact, one being digital. They get regular tests and
battery changes; I'm no fan of CO either.
We're dithering about getting a new boiler. The Baxi BBU might be a
candidate, but I'd like a 'normal' DHW tank so it might not be
The only other practical place is in the (rather narrow) airing
cupboard, and I doubt if there would be enough room for a DHW tank as
well - and one would have to be mounted above the other.
Measure the CO divided by CO2, and if less than 0.004, they deem it OK
as far as combustion is concerned. I don't know for sure, but I suspect
they at least do a visual check for corrosion of the case, and a visual
check on any case seals which can be seen without opening it.
Buying and running a flue gas analyser isn't cheap. (covered this in
a recent thread).
There are other parts of the system which should be serviced too, such
as flushing and replacing the inhibitor occasionally (just how frequently
depends if it's vented or sealed, and for sealed, how often you top it
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