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Worscester 24i boiler

No heating or hot water gas wont ignite lost water pressure now refilled but seems to be airlocked anyone know how to vent boiler

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  • blue236 Feb 19, 2009

    it should have an auto air vent that does itself i think other way to do it is see if rads have air. hope this is of help

  • Rod Davies May 11, 2010

    The manual vent [automatic pressure relief valve] is inside the casing usually a large red knob which can be turned by hand situate at the lower right - You should have a pipe which goes through the outside wall from it This vents and will empty the whole system inc rads
    The auto vent is usually close to the water pump and has a small red/black knob [short biro top size] this should be open by 1 turn from closed This vents the air from the boiler only, automatically when in use
    Lost pressure = leak maybe through manual vent - have a look outside where the vent pipe goes through the wall
    If your pressure is about 1 bar then its something else Does the fan [on top of boiler and at start of the 110mm vent pipe] work. This should come on when there is any demand from boiler even if it does not fire up




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There is sometimes a large screw on the front of the of the pump un screw a bit and see is air comes out

Posted on Apr 06, 2010

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Ran out of oil, when refilled managed to get heating working but oven not


How to bleed and restart your oil heating. - Instructables

www.instructables.com/.../How-to-bleed-and-restart-your-oil...

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Dec 21, 2015 | Ovens

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Hi I have a 24i worcester boiler I have drained the heating to do some work but I need the hot water to still work.I spoke to Bosch and they said I need to put a loop in.I am not a plumber but can get


Hi Steve, I am not a plumber but have done a lot of DIY on my own heating system with Worcester Bosch combi boiler! I believe that you can have the hot water on without the heating system filled, just turn all the settings as for summer use and the thermostat right down so the heating is forced to stay off!

Nov 07, 2014 | Water Heaters

1 Answer

Wickes 102 combi boiler constantly loosing water pressure


It sounds like your thermostat could be the problem. Have you noticed the boiler cutting off at all, or does it run continuously until it goes out on low water?

You stated, "when boiler is on", so I am wondering how you get the boiler on. If your boiler is controlled by a thermostat, you need to check it for a cold draft possibly from behind the thermostat in the wall where the wires come through. The thermostat should never be on an outside wall. The thermostat could be defective.

An aquastat can also control your boiler. If you have an aquastat, check the setting, typically 175 - 180 degrees. You should also have a "high limit" which should be set at 210 - 220. Some people run that high side limit higher; not a good idea - defeats the purpose. If the aquastat is set too high, the boiler will operate too hot and the problem you have will occur.

"pressure rises and pressure relief valve opens" This could mean that your pressure switch is prematurely venting. Check boiler temperature to see exactly at what temperature the T&P valve purges. If it blows off below the high side setting, either adjust or replace. The T&P valves are usually not adjustable. That blow off temperature is stamped on the head of the valve. So, if it discharges too soon, replace it.

Have you actually seen evidence thgat the T&P valve is opening? You may have a bad bladder in your expansion tank and your system may have air in it. Your boiler should have 12 psi when cold and 20 - 22 psi when operating. Check your boiler pressure guage.

"
this eventually drops below the minimum operating pressure" Technically, there is set point for a NO MINIMUM OPERATING PRESSURE. That is a function of the amount of water in the boiler. If the T&P is blowing off, it will vent water from the boiler and the boiler pressure will go down. There is a minimum operating TEMPERATURE.

Your boiler could be low on water. You will have to manually fill the boiler. Be careful of thermal shock to the boiler. Feel the piping, and fill only when the circulator is running. Make sure the water is not going directly into the boiler. The supply water should go into the circulating supply side which feeds the radiators, radiant floor, or base board circuits.

All this will adversely affect your hot water. The heat exchanger for the potable hot water may have scale build up in it. Using the hot water keeps the boiler running, and a scaled heat exchanger will give you cooler hot water and the boiler keeps running. If this is a problem, you will need to replace the heat exchanger. A better idea is to not use the boiler for your domestic hot water. Why run the boiler in the summer?

Feb 02, 2013 | Water Heaters

2 Answers

My worcester bosch 24i junior pressure keeps dropping if i have heating off for an hour i have to top up boiler and reset also when i have heating on the pressure jumps right up to over 4.0bar


When water is heated it expands. To deal with this all boilers are fitted with a small expansion vessel which is like a reservoir which holds the excess water.

This expansion vessel is like a balloon in a metal pot. When the water goes in the metal pot the baloon squashes a bit to make room for the extra volume of water. When it cools the balloon pushes the water back into the heating system.

What has happened is your expansion vessel no longer works. When the water heats up there is nowhere for it to go so the pressure jumps up to 4 bar. The Worcester boiler lets high pressure water escape (most boiler allow this to go through the safety valve at say 3.5 bar).

When the water cools the pressure drops very low as the volume of water contracts.

The problem is your expansion vessel - normally a little red painted metal cylinder inside the boiler.

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1 Answer

Flashing red light on Worcester 24i junior combi boiler


Pressure is ok? at 1 bar or above
I think on this one there should be a reset button [red] on the left hand top of the casing - or lower the control panel [ phillips screw on each side] and the button is on the left of the base plate. Press this and try the heating.or hot tap
P.S. if you're on a prepayment meter check you have gas.

Nov 08, 2009 | Water Heaters

1 Answer

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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what size of gas line is going into boiler and water heater? is it black iron ? natural gas or propane? have you checked gas pressure at water heater and furnace ? if they work fine individually then you have a problem with incoming gas pressure. Call gas company and ask them if they would come out and check gas pressure.

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1 Answer

Fan runs continuously


the air pressure which does not controll the fan it is a safe guard for the gas/oil burner to ignite nowing that the fan is running ( air switch normaly negative /positive prssure n/o,n/c circuits. it could be that your boiler is designed for a cant think of techinacal name but when in centre of house/factory and has 1 or more boilers connected to flue etc the fans run when only power to boiler is on , non vented system ? it could be a simple link to remove in controll panel i would phone technical help for manufacture ?

Jan 31, 2009 | Water Heaters

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