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Domestic heating system

My worcester 30cdi boiler lost pressure on system whilst i was away, on return i had no hot water. I re pressurised the sytem but the boiler will only go through the air purge sequence and does not fire up

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Contacted supplier and they have arranged a visit.
Thanks

Posted on Sep 15, 2008

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Posted on Jan 02, 2017

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Honeywell technical support


This boiler, from memory, has an electric diverter valve.
If the system has dirty (sludge/scale laden) water then the diverter valve may not return under spring pressure, and therefore not divert all of the hot boiler water to the hot water heat exchanger, leaving some going to the rads.
If I am right then the rads will not get fully hot.
If the valve has failed completely, or electrically, then the rads will get fully hot and there will be no hot water output (hot water will be cold).

Aug 19, 2014 | Heating & Cooling

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Worcester bosch 24i combi empties itself after re-pressurising Whilst re-pressurising boiler my partner (carelessly) went over the max pressure, it hissed & promptly emptied itself- I assume this...


3 psi is a little over the average, 2.5 is the optimum setting. If it empties itself, it means that the safety valve is working,which prevents any kind of damage to pipes etc...Make sure the valve is open and close at the right time and top up the system slowly rather than in a hurry. If the system requires regular top up then there must be a small leak somewhere, so it is best if you can fix that too. Remember that there are some solutions that are added to the water circulation and if you are constantly topping up with water then you are losing these solutions that prevents rust build up etc...Hope this helps.

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Lighting the pilot light on a Worcester 24CDi combi boiler.


Most of these boilers don"t have a permenant pilot light they have electronic ignition that lights the burner when you are calling for heat or hot water, is there enough water pressure in the boiler ( there is a small gauge on the bottom r/h side of the boiler the needle should be sitting at between 1 - 2 if not enough pressure the boiler won"t light )

Apr 23, 2010 | Heating & Cooling

1 Answer

I need a diagram for an indirect hot water system heated by a solid fuel boiler and an oil boiler


If you are using more than one heat source you will have 1 more pump than the heat source pumps Main pump = SYSTEM pump pumps through the indirect hot water system and back into itself. This is the system loop. The other two boilers tee into this loop upstream of the indirect tank, downstream of the SYSTEM pump. The cold water return to each boiler tees into the system loop next to and upstream of where the hot water for that boiler tees into the system the loop. The oil boiler will have its own pump on its return line from the sytem loop and the solid fuel boiler will have its own pump. When any boiler fires, it turns on its own pump AND the system pump. If you want a drawing email me -pipesster@gmail.com send a fax number and I'll fax you a drawing.

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1 Answer

The pressure drops very slowly over a month then needs topping uo from the filling loop to 1.5 bar. when the heating is on it goes upto 3 bar. the pipe outside is slightly damp. it was fine during the...


Sounds like the expansion vessel in the boiler has lost pressure or is faulty. If you have a tyre pressure gauge, locate the expansion vessl and check the pressure via the schraeder valve. It should be around 1.5 bar. If there is no pressure you can re pressurise it with a bicycle pump. Should it not pressurise then you will need a new one. The pressure relief pipework outside is damp because the system is over pressurising at relieving pressure at 3 bar. This obviously causes a system pressure drop. You can install a pressure vesel into the heating return pipework should accessing the boiler be difficult.

Oct 31, 2009 | Water Heaters

1 Answer

Central heating and hot water have suddenly stopped working


not an engineer but maybe a heating compant,, it sounds like you have a relay that has gone bad, you have what we call a winter summer system your domestic water comes from a tank inside the boiler, you might want to think about splitting the system to save you some money in the long run, seperate the water heater from the boiler so you only heat up in the winter, right now you are heating the system that heats your house to get 30 or 40 gals of domestic hot water, it would cost you less by seperating them

May 17, 2009 | Water Heaters

1 Answer

Bosch Worcester boiler, central heating not working


boiler may need more pressure in system pressurise to middle of green between 0.5 bar and 1.0 bar

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