- About four weeks ago I noticed the the radiators were taking longer and longer to warm up.
- I decided (for no reason other than it's never been done for 7 years) that the system is probably gunged up, and needs draining and refilling.
- Most of our radiators are at least 30 years old; it is a microbore system (dammit); inhibitor was put in when the system was last filled, 7 years ago.
- I was delayed in booking a plumber by a holiday, and by a family visit.
- While the family were here (last weekend) the system packed up altogether: no heat to the radiators, and the hot water not working well either. Then the boiler started to stall, with a "Circulation Fault" (this is a Glow Worm Flexicom HX, Fault code 25).
- (Assisted by a Google search on the relevant fault code), I was encouraged in my belief that the system is bunged up and needs flushing. However ...
- ... two different plumbers whom I've contacted (both unavailable for weeks btw) both said there's no reason why it should be bunged up if there is inhibitor in the system.
- So could it be the pump that needs renewing? Or perhaps the 3-way valve? Or maybe there's a boiler fault? But ...
(a) the pump makes a noise like it's working (it's on speed 2 of 3); (b) and the 3-way *seems* to work, in that the relevant pipes get warm at the relevant heating stages; (c) and the boiler doesn't *seem* to be complaining, other than stopping with the Fault Code when it's had enough of trying to reach, and sustain, operating temperature.
The two plumbers I've contacted aren't available for a fortnight, and moreover seem reluctant to take on this sort of job. I am willing (and moderately able) to do "something" myself, but I'm extremely chary of doing anything, unless I know what the "something" ought to be. For example I would drain the system and refill, if I could be confident of doing it correctly -- there's ample opportunity for screwing things up worse than they are already.
If anyone's got any broad-stroke advice for my next move, I'd be very grateful. I'm well aware, btw, of the excellent section in the Wiki, http://wiki.diyfaq.org.uk/index.php?title Κtegory:Heating but (as I have been saying ad nauseam) I'm not sure where to start.
John "Thank goodness it's Spring"