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Baxi 30/85 "low pressure/pump fault"

Discuss Baxi 30/85 "low pressure/pump fault" at UK Plumbers Forums; 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 ...
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    Default Baxi 30/85 "low pressure/pump fault"

    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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    Default Re: Baxi 30/85 "low pressure/pump fault"

    are you gas safe registered?
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    Default Re: Baxi 30/85 "low pressure/pump fault"

    Yes. I can't figure this one out.

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    Default Re: Baxi 30/85 "low pressure/pump fault"

    as i need to check your details before i tell you whats wrong with it could you give me your gas safe registration number please
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    Default Re: Baxi 30/85 "low pressure/pump fault"

    I'm in Ireland

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    Default Re: Baxi 30/85 "low pressure/pump fault"

    yes they still have gas safe in Ireland and have from April 1 2010
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    Default Re: Baxi 30/85 "low pressure/pump fault"

    I should know :-) The RGII

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    Default Re: Baxi 30/85 "low pressure/pump fault"

    Hi guys, I am new to this forum and have a similar problem with a BAXI 30/65. I have checked the usual things, expansion vessel, pump, leaks and I also have replaced the hyd press valve diaphragm, but still the pressure will not stay above 0.5 bar. Gasman, I think you may have the answer, I am Gas Safe Registered (226897).

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    Default Re: Baxi 30/85 "low pressure/pump fault"

    so do you have low pressure and a dead boiler?
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    Default Re: Baxi 30/85 "low pressure/pump fault"

    It is currently working, but was dead with a low press LED before I replaced the diaphragm! Any clues?

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    Default Re: Baxi 30/85 "low pressure/pump fault"

    are you saying the pressure wont go over 0.5 bar? is cold water pressure good there?
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    Default Re: Baxi 30/85 "low pressure/pump fault"

    Water pressure is good, I can top up the pressure to any point i wish, but as soon as the filling loop is turned off, the pressure drops back to 0.5bar. There are no obvious leaks in the boiler, or in the system, however some of the pipework is under floors. Circulation appears good, all radiators get hot quickly!

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