I have a puma 100e which has just developed a fault - the hot water is working fine, but the central heating seems to be completely dead... when the timer calls for heating (or I switch to "constant"), I hear a faint click a second or so later (like a relay switching somewhere?), but nothing happens - pump doesn't start, boiler doesn't fire up... the machine is silent.
The pump and fan _do_ seem to be running fine when there's a demand for hot water, and the red diagnostic LED on the system board lights when the hot water is running and switches off as soon as the demand stops. The pump will run for a couple of minutes after the hot water is turned off, and I can feel the central heating pipes getting warm.
Possible cause: About a week ago, I discovered that the expansion vessel on the heating circuit was short of air (after observing some wild fluctuations on the system pressure guage as the system warmed up, and the occasional random venting of water). I topped up the expansion vessel to the recommended pressure using a car tyre pump. This seemed to work well - for a few days, the system pressure needle was absolutely stable and the heating seemed to be running better than it has for years... then, 2 days ago... totally dead.
To be honest, this boiler is a bit of a turkey... we inherited it when we bought the house, and over the last 5 years I've ended up replacing the diverter valve, pump, fan, system board... I'm kind of getting the message that it's time to stop throwing good money after bad and get a new one fitted, but if anybody could suggest something to keep the beast limping along for a little while longer, I'd be much obliged
The pump and fan _do_ seem to be running fine when there's a demand for hot water, and the red diagnostic LED on the system board lights when the hot water is running and switches off as soon as the demand stops. The pump will run for a couple of minutes after the hot water is turned off, and I can feel the central heating pipes getting warm.
Possible cause: About a week ago, I discovered that the expansion vessel on the heating circuit was short of air (after observing some wild fluctuations on the system pressure guage as the system warmed up, and the occasional random venting of water). I topped up the expansion vessel to the recommended pressure using a car tyre pump. This seemed to work well - for a few days, the system pressure needle was absolutely stable and the heating seemed to be running better than it has for years... then, 2 days ago... totally dead.
To be honest, this boiler is a bit of a turkey... we inherited it when we bought the house, and over the last 5 years I've ended up replacing the diverter valve, pump, fan, system board... I'm kind of getting the message that it's time to stop throwing good money after bad and get a new one fitted, but if anybody could suggest something to keep the beast limping along for a little while longer, I'd be much obliged