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Worcester heatslave 26/32 pressure too high and water coming out overflow

Pressure was too low and topped up previously not constant trickle of warm water coming from overflow pipe outside pressure sittting at three bar

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  • Anonymous Dec 29, 2008

    Same problem

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? so was my response any help? - if so please rate me thanks- I did this for 21 years -so it should help. Al

Posted on Nov 03, 2008

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2 Answers

Rheem 71 30d


You should be able to control hot water temperature by adjusting the thermostats. Either or both may have failed, causing heating to increase to the maximum. The "spitting" is caused by boiling water. Likewise, the pressure relief valve is operating as it should resulting in the overflow you observe. You need to get your heater serviced immediately!!

Oct 10, 2013 | Rheem Tankless Hot Water Heater...

1 Answer

Worcester 35cdi water and heating luke warm


First thing is to know when it was installed? Check the top of the unit and see if it has in and out marks on it. If it does are they correctly hooked up? Installing them backwards causes this.

Jun 04, 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.

Dec 22, 2010 | Bosch Water Heaters

1 Answer

Overflow pipe flowing


Check temperature off the water for proper functioning thermostat. Look at set points on heater's thermostat. It's made to let water out when water get's to a certain high temp. More than likely it will be the pressure relief valve going bad and not holding.

T&P releif valve can be replaced on heater. Turn water off and remove with a pipe wrench. It will come out and any hardware store will carry it. T & P pressure relief valve is 3/4 threads.

When installing new one use teflon tape on threads.

May 23, 2010 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

Halstead ace high boiler making a whining noise when central heating is turned on also pressure reduces after about 4 hours, need to top up verey day.


Whining = pump bearings
Pressure reduction = pressure relief valve diaphragm either perished of gunged up - look for water coming out of the overflow pipe from the valve
leak in ch system look at all joints

Nov 30, 2009 | Water Heaters

1 Answer

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

Oct 15, 2009 | Water Heaters

1 Answer

A trickle of hot water from taps, central heating ok


it sounds like your shut off valve might be bad even though it turns on and off by turing it doesn't mean that the washer is not stuck to the seat and not opening, try replacing the valve

May 18, 2009 | Water Heaters

1 Answer

Constantly locking out


overheat stat or fan best of luck

Jan 10, 2009 | Water Heaters

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