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I have a Bosch Heatslave 12/14 15/19 20/25,floor standing oil fired combination boiler. It leaks from the bottom, water pressure drops and I have been told that I need a whole new unit ( the main part ). My plumber said he could not fix till after new year. Can you arrange to have this done quickly and can you give me approximate price. I was told it would be about a day's work.I live in Dumfries.

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  • Heating & Co... Master
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Sorry but FIXYA does not do Physical repairs of any product .nor can we do any scheduling of work for other people . TRY a different LOCAL plumber

Posted on Aug 05, 2017

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Posted on Jan 02, 2017

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SOURCE: re: worcester bosch heatslave 20/25

Air in Oil line, Blead air out.

Posted on Aug 25, 2008

  • 1 Answer

SOURCE: i have a bosch 24cdi

if this occurs when the unit is in use for only hot water, there will be an internal leak in the secobndary heat exchanger, you will have to replace it. check first that the charging link has been removed when testing to ensure it is not passing.
if it happens when the heating is switched on then check the presure in the expansion vessel ( dump all presure from system and use a car foot pump with a gauge there should be 1 bar presure) that is the big red thing behind the pump, if water comes out of the test valve on the front of it when you try to test it or it wont hold the presure you will have to replace it (a nasty job you have to strip half the boiler) if you can pump it up make sure you release the presure in the system as you pump it or you will get a false reading

Posted on Sep 07, 2008

  • 659 Answers

SOURCE: Oil fired boiler not firing up

Do you have an inducer on this unit? If you do, it could be the pressure switch not opening or closing properly. Also, check for any limit switches that might have tripped that you need to reset. Some limits are automatic reset and some are manual. Also, check for a reset switch on the unit that is used when the power gets cut un expectantly. You can do a little research on the unit also using the model number and brand of unit on-line to find a user manual that might have some trouble shooting guidelines.

Posted on Mar 22, 2009

mrhotandcold
  • 248 Answers

SOURCE: worcester oil heatslave boiler pressure rises to over 3 bar when

iif you,ve tried everythng change gauge

Posted on Oct 12, 2009

  • 150 Answers

SOURCE: combi boiler loosing water pressure in heating

There is a 15mm pipe from the pressure relief valve which should so through to the outside. These valves are prone to leak after time. Look at the end [outside] of this pipe. Wet = leak from valve

Posted on Dec 22, 2009

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I have a Heatslave 12/14 oil-fired combi boiler installed approx 8 years ago. A problem has just developed on the domestic hot water side. My local heating engineer has investigated but so far hasn't...


Symptoms sound like crossover might be part of problem:
Crossover is when cold water enters hot water line due to faulty plumbing part like check valve, mixing valve, or bad faucet cartridge.
http://waterheatertimer.org/Crossover.html

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The pressure started to drop every day and needs to be filled with water(dry fire??). This happened after repositioning of some of the radiators daown stairs after fixing the wood flooring. The...


Hello
The operating pressure should be between 12 and 15 psi.It may go up some while in operation.

A pressure loss indicates a leak,you may be able to find the leak by filling the boiler up to 15 to 20 psi,then running it for a while.

Once you have it running check all fittings and solder joints for water leaks,lay a white paper towell down at the radiator conection areas and see if you get any water spots.Sometimes using a soap and water solution and applying it to the joints and connections will help,if you see bubbles thats where your leak is.

You sound like you have a 2 story house,check the upstairs radiators also.

Mar 04, 2011 | Heating & Cooling

1 Answer

We needed to turn the water off at the stopcock to repair a tap and for safety we turned the boiler from all day to off. when we turned the water on again the boiler was off completely. what do we need to...


Hi the temperature control on the boiler should start the boiler as soon as you restore power to it. I don't know if you have a automatic ignition module or a standing pilot. If it is a standing pilot, make sure it is lite.You should have a temperature gauge telling you the water temp., and if it was off all day I am sure it is very cool. Do you have a drain valve on the front bottom of this boiler? If so, and you have a floor drain, turn it on as you may have gotten air in the system causing it not to fire up. If not, open all outside hose bibs/faucets and indoor faucets and let them run for awhile. If the water was drained out from the boiler to repair this tap, its off on its low pressure shut off switch. This is a safety. After bleeding any dirt or air from the system, make sure that you hear the boiler filling up with water. Once it reaches its low pressure cut off, it will fire up and start to heat the water. I don't know how large it is, but it may take some time to reach its cut out switch before it will fire again. Please keep me posted in the comment box. Please rate me on my help to you, and I thank you for this.
Sincerely, Shastalaker7
A/C, & Heating Contractor

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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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overheat stat or fan best of luck

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