d_d Posted February 6, 2012 Share Posted February 6, 2012 Hi guys, just wondered if there was any experts in the field. Basically my boiler plays up now and again. Normally in the morning i go for a shower and its cold! so i go to the boiler and it flashes 60 the fault code being low pressure or the pump So the gauge is down to 0 fill it up 5 secounds worth, and it fires up. From what i can see there is water in the system but at the boiler there is not and doesnt take much at all. What causes this loss of water, does the time of the year affect anything as the pressure when the heating is off sits pretty low anyway. Quote Link to comment Share on other sites More sharing options...
merckx Posted February 6, 2012 Share Posted February 6, 2012 Combi boiler? The central heating pressure is down to zero, and you're having to top it up with the filling loop? You shouldn’t to have top the water up in the central heating very often at all. We have a Baxi combi, they recommend 1.0 bar, if it’s less than 0.5bar you’ll have problems. Do you bleed the radiators when you top up the pressure, on our boiler you also need to open the bleed screw on the automatic air vent whilst topping up. Quote Link to comment Share on other sites More sharing options...
d_d Posted February 6, 2012 Author Share Posted February 6, 2012 Combi boiler? The central heating pressure is down to zero, and you're having to top it up with the filling loop? You shouldn’t to have top the water up in the central heating very often at all. We have a Baxi combi, they recommend 1.0 bar, if it’s less than 0.5bar you’ll have problems. Do you bleed the radiators when you top up the pressure, on our boiler you also need to open the bleed screw on the automatic air vent whilst topping up. Tried bleeding, no air in the system, does this screw need to be left open all the time, altho im not so sure i closed it anyway i tried thinking maybe thats where it was leaking from. Quote Link to comment Share on other sites More sharing options...
merckx Posted February 6, 2012 Share Posted February 6, 2012 For our boiler it says to open it whilst pressurising the system to 1.0 bar, it doesn't actually say whether to close it or leave it open after that. I normally switch the heating on to get the water pumping around the system, I then open and close the bleed screw until all the air has gone. I don't know if we're talking about the same boiler, below are the installation instructions for the 80HE and the 105HE. http://www.baxi.co.uk/docs/Baxi_Combi_Instant_HE_Installation_and_Servicing_Instructions.pdf Quote Link to comment Share on other sites More sharing options...
Havard Posted February 6, 2012 Share Posted February 6, 2012 Your expansion vessel has lost it's charge mate. When your system expands it will be forcing water out of the safety valve. When it contracts it will cut out on low pressure. Have you watched the pressure gauge after you have pressurised it? It should be 1 Bar when cold and then maybe expand up to 2 bar when the system is fully heated. Mine only gets to 1.6 as I don't have that many radiators these days. I imagine yours will shoot up to 3 Bar and then suddenly reduce to around 1.5 ish. Either that or you have a leak somewhere? If you can't find a leak and the safety valve isn't leaking then it could be a crack in the heat exchanger and the water is flashing off as steam out of your flue? H. Quote Link to comment Share on other sites More sharing options...
d_d Posted February 6, 2012 Author Share Posted February 6, 2012 Your expansion vessel has lost it's charge mate. When your system expands it will be forcing water out of the safety valve. When it contracts it will cut out on low pressure. Have you watched the pressure gauge after you have pressurised it? It should be 1 Bar when cold and then maybe expand up to 2 bar when the system is fully heated. Mine only gets to 1.6 as I don't have that many radiators these days. I imagine yours will shoot up to 3 Bar and then suddenly reduce to around 1.5 ish. Either that or you have a leak somewhere? If you can't find a leak and the safety valve isn't leaking then it could be a crack in the heat exchanger and the water is flashing off as steam out of your flue? H. At the moment the pressure is to high, im having to release some manually through the relief valve, How do i go about checking my vessel charge, where the hell is it? and what does it look like? Quote Link to comment Share on other sites More sharing options...
merckx Posted February 7, 2012 Share Posted February 7, 2012 where the hell is it? and what does it look like? It's the tank (I thinks it's red) at the rear of the boiler with the valve on it. I can't remember if you can get to the valve, it's a while since I've had the covers removed. If it's the 80HE or the 105HE Baxi it's all in the link I posted earlier, it takes ages for the pdf file to download. Quote Link to comment Share on other sites More sharing options...
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