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Baxi boiler. Low presure/pump fault

Cole C · 2011-03-31 09:54:08

I have a baxi 30/85 boiler which shows a "Low pressure/pump fault" flashing neon light. The pressure is not low. It shows between 1 and 2 bar on the pressure gauge. A first it was an intermittent problem and the boiler wouldn't fire. Turning the power off and back on a couple of times would get the boiler to start. I was…

31-03-2011 9:54am

#1

Cole C

Registered Users, Registered Users 2 Posts: 1 ✭

Join Date: March 2011

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I have a baxi 30/85 boiler which shows a "Low pressure/pump fault" flashing neon light. The pressure is not low. It shows between 1 and 2 bar on the pressure gauge. A first it was an intermittent problem and the boiler wouldn't fire. Turning the power off and back on a couple of times would get the boiler to start. I was advised to change the diaphragm in the hydraulic pressure valve and this made things worse. It now won't fire at all. I changed the pressure valve and this didn't help either. I now have to turn on the boiler, wait for the central heating light to come on , then pull out the micro switch on the pressure valve and the boiler fires up. The problem is, the pin which activates the micro switch won't come out to activate it. I checked the pump and it runs so I'm nearly sure that's not the problem. I checked the expansion vessel and I didn't get any water coming out when I pressed the valve. I re pressurised the expansion vessel and the boiler still doesn't fire. There is an automatic filling valve which I presume has a non-return valve. I closed the gate valve after it in case to no avail. What else could cause this problem? I think I checked everything. Could there be a loss of pressure or fault in the cylinder coil?

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