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Worcester combi boiler losing pressure & water through o/flow

6 year old Worcester combi boiler losing water out of overflow pipe and consequently water pressure reduces to zero.

Heating and Hot water working as normal

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  • cliffschris Jan 20, 2009

    I've got a brand new Worcester combi boiler. It's great except it keeps loosing pressure, drops from 1.5 to 0 in a week. Can't find any visible leaks but have a concrete floor under laminate downstairs, I can't possible have it all dug up just in case there is a leak underneath. Is there anyway I can tell for definate if any underfloor pipes are leaking? My plumber has been back and he's checked rads for air in them and leaks. Also the pipe which goes outside if here is blow off and all was OK. Now he is stumped. Help!

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Having the same problem and its a new bolier. thanks , adriano.

Posted on Jul 12, 2009

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Replace pressure release valve

Posted on Jan 03, 2009

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Worcester 350 combi boiler on but water cold and radiators cold. Have put pressure up but made no difference. What's wrong with it?


If the inline pump is not working no hot water will flow into your radiators. The pump pushes the water in the lines to create a water flow. Increasing the pressure will not help in this case. I recommend you put the pressure back down as it usually is preset when the boiler is installed. My pump is about three feet back of the boiler on the intake line. If you don't know what you are doing I recommend getting a repair man as you could create more problems by over heating the boiler its self and blowing the electrical parts up.

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Worcester combi gas boiler 3.5 highflow is constantantly dripping water at the external flue position over flow pipe


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I have an ideal standard he30 boiler instaled about 6 weeks ago. the boiler keeps losing presure about half a bar every 2 days if i dont top it up it will trip the fuse on the fuse board acording to the...


All the combis I've come across merely fail to fire if the pressure is not up. not only do they not fire, nothing else works including the pump and in any event the pump should not overheat just on low pressure.
water loss - try turning off the valves on the flow & return pipes [3/4 inch ones] 1 valve per pipe . This will isolate the rest of the system - rads etc Note pressure over a time period. In this mode the hot water circuit will still work but do NOT use the heating circuit
1/2 bar over 2 days is not serious but it should be found
Once you have either mended the leak in the rest of the system or found there is not one, insist on a replacement boiler
In any event having looked at the reasons given for the fuse blowing, I would definitely get a replacement.
These problems should not happen on a new boiler
I list Worcester.-Ariston-GlowWorm-Ideal- and many others who would confirm this

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Worcester 350 boiler pressure low - warning light comes on so i top it up with water half an hour later the pressure drops again. Have checked rads and pipes no obvious leaks. Water seems to be coming out...


That overflow is the Pressure Relief Valve.usually they are set at 3-3.5 bar but over time they can be gunged up inside and leak/allow water to flow out. Dismantle & clean or replace. Turn off mains water and ch pipes before removing - operate valve remove & allow for some water to leak from it

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Worcester 24i combi when in shower hot water flicks on and off can hear gas igniting and extinguishing


This is lack of water flow through the diverter valve.

First have you got a good flow from any cold tap? If yes then see below

If I remember there is a pipe carrying cold mains crossing the lower front of the boiler with an in line filter usually clogged. Remove clean & replace
check also any filter in rising mains to boiler

another cause is the diverter valve itself - diaphram inside may be punctured/split

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Very Hot water coming out of overflow pipe


Is your boiler heating your domestic hot water if so i would turn water off to water maker and see if your boiler pressure stays down below 20 psi. If so water maker is bad. The other thing that could cause this problem would be the boiler pump is out.

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I have a worcester greenstart 30 cdi boiler that is 2 months old and it has been very noisey this morning and now has come up woith error code ea, we have no heating or hot water - the reset button is...


Not the best day for this to happen.

Check the system pressure and top up if necessary - but after that the best advice is to get the people who fitted it for you to come out and sort it - These Worcester combis usually have a 5 year parts warranty and with a boiler that's just a few weeks old, you oughyt to be able to get the labour for nothing as well. It would be a shame to throw those benefits away by tinkering yourself.

A.

Jan 01, 2009 | Water Heaters

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