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I recharged the water now the boiler will not fire up. If I take the burner box cover off it works now and again, I took the water pressure back down again but no difference.

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  • Marsh845 Aug 02, 2008

    it is a Vokera compact HE condensing boiler

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Can u tell the name and model no

Posted on Aug 01, 2008

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2 Answers

What is going on with my furnace? When the burner comes on there is a knocking sound coming from the boiler area which continues as long as the burner is firing and continues for 30 seconds after.


knocking in systems is from fluid hammer in the pipes
It can be controlled in the first instance by the proper mounting of the pipes in the saddles ( more saddles the better --- less chance for the pipe to hit the wall or brackets )
The "hammer" occurs when a valve is opened and fluid stats to flow then the valve is shut off rapidly . the fluid is still flowing and so it hits that valve and the pressure builds up in the pipe ( knock) the valve is again opened reducing the pressure in the pipe only to shut off quickly again making the pressure again build up ( knock)
The are devices called accumulators available fro good plumber suppliers shops , that have a gas filled bladder in the unit
When the valve shuts off quickly , the flow of the fluid is absorbed against the gas filled bladder and then released when then valve is again turned on
this smooths out the stop/start action of the fluid and so stops the hammer or knock
The noise should be treated seriously as it will loosen of fittings and joints causing leaks and if extreme , will split pipes
As an example of what I am talking about take your garden hose and fit a stop hand piece to the end of the hose . turn the tap on , you will see the hose move as the water pressure builds up in the hose
press the trigger and see the hose relax
stop the flow quickly and again see the hose react
That relaxing and reaction of the hose is water hammer or knocking but you won't hear it in a hose , but with rigid pipes the action comes out as a vibration , like a drum being hit

Dec 30, 2015 | Air Conditioners

1 Answer

Ideal response combi boiler model 120 loud vivrating / high pressure/ zero pressure


the low pressure issue is most likely the expansion vessel needs repressuring because the valve has leaked and is not seating properly so causing water leak outside.- with the pressure on zero, drain about 1/2 bucket out, mine had a exit tap near the inlet tap, then attach a car pressure gauge/ pump to the top of the orange exp vessel. pump it up to about 1.5 bar, that should do it..you may have to do this 2 or 3 times..
re loud rumbling sound, mine had this too, and at around the same time ! heres how to fix it..
BGas engineers are lazy, and unless you watch em like a hawk they lie about changing a part...mine had this loud noise problem and its caused by the gas being deflected out, because it has not been ignited by the spark electrodes, and the rubbish boiler doesnt detect this quick enough, so some gas gets out ..You may be able to smell some gas too. The cover is supposed to stop this, but it dont.

with power isolated, all you have to do is carefully remove the fan, and then the burner, and then dry it, clean it, and adjust the electrodes, 5mm gap between the pair of spark electrodes, and 7mm gap to the cone. and 7mm for the sensor electrode. Mine had a bit of water, i think its from the condensation coming back down the flue ? because the exchanger looked ok.

Also be careful of knocking the sensors and wires, and also check if these are ok as well.
This is a very common issue and nobody tells you

Oct 06, 2012 | Air Conditioners

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

Feb 20, 2011 | Air Conditioners

1 Answer

The boiler stopped twice during a week. The reset button was pressed whenever to start the boiler again(twice during a week). Is it abnormal? Does the reset button need to be replaced?


Good Question!-- Let's see if we can figure this out--

What kind of fuel are we talking about? - Gas or Oil?

Any clue as to WHY the boiler stops?--
Can you see a water level, or a temperature or a pressure setting/ gauge?
Tell us what some of these readings are--

If it is gas-- how does ignition take place?-- Spark, or ignitor ignition?

Where is the Reset button?-- is it on the burner control-- or the water level control?

Tell us more--

Mack B

Jan 17, 2011 | Air Conditioners

2 Answers

The boiler wont fire up and the blue light flashes once per second


Let's see what we can do to trouble-shoot this boiler--

First of all-- Are we talking about a Hot Water 'Boiler'-- In other words does this boiler heat water that circulates thru the house, to keep you warm?

Next-- What is your fuel?

Have you Shut the system down, to reset it?-- What happens when it comes back on again?-- Clicking sounds-- pumps trying to start-- solenoids trying to open, etc.-- Tell us what you observe-- so we can help you trouble shoot this problem.

Mack B

Jan 15, 2011 | Air Conditioners

2 Answers

Vaillant boiler (VCW GB 221) not heating up water or heating although the pilot is lit. Pump is heard working okay but there is small drips of water underneath boiler. Any idea's?


The movement of the diverter valve is critical on this appliance, and is located on rear right of the boiler, when hot water is turned on, theres are two microswitches, which must break (they both close in Central heating mode), if pump is running, it is recognising the hot water demand, check microswitches are breaking, if not, it tends to be a defective servo valve (located above the water valve), or a blocked/ restricted control line (small copper tubes which connect into the servo valve)

Nov 29, 2008 | Air Conditioners

1 Answer

Water and radiators dont come on at the same time i have to turn the valvue with screwdriver and then water comes on or turn it again then radiatorscome on please help


I assume this is hotwater heating.  Your problem is air in the line.  You may have something called an airscoop at the boiler...it is attached to a pipe at the top of the boiler and has a radiator vent unit on top.  Purge it and you may fix your issue...or not.
If you don't have one or the problem persists, you'll have to bleed all of the radiators...perhaps several times.  Be sure when you're doing this that you have water in the boiler before and after.  If you fire a dry boiler, this is a problem which will be very expensive.  You should see about 15 PSI or so of pressure indicating on the gauge.  If you see less than 10 or more than 25, you also have a feed valve issue.  These things do get dirty and they do clog.
If your vent valves at the radiators are more than 10 years old, get replacements.  Take a couple of pictures of them and go to the plumbing store.  Turn the water to the boiler off and quickly change each one.  Turn the water back on, bleed again and you will be fine.

Nov 13, 2008 | Air Conditioners

2 Answers

Riello oil burner RDB with red plastic cover at the front wont ignite. I've tried bleeding the valve. The motor seems to make an electrical humming noise for about 12 secs, then the system attempts to...


The motor should spin when the boiler is switched on. One end of the motor spins the fan the other end works the pump. The control box then starts the transformer that starts a spark. The control box then opens up the oil. The boiler should then light if any of the above or the boiler does not light, the boiler will go to lockout.
From what you say the motor is not spinning, thus it could be the motor or more like the pump.

YOU SHOULD NOT PLAY WITHE THE PUMP

If the wrong setting is made it could 1 burn out the back of your boiler 2 go to soot and the boilers in an hour would be filled up and become a fire risk. 3 not start at all if the setting is too low it is a fine line to get it to work and needs the right tools.

regards
oil eng.

Oct 26, 2008 | Air Conditioners

1 Answer

My Worcester Bosch 35cdi boiler is flashing temp then backwards t forwards t, whats wrong with it.?


35 cdi worcester combi about 3 years old,heating not working,hot water works fine.It's been serviced not long ago.Room stat turned up and trv's ,but boiler want fire up,there's power to the boiler and the room stat the built in time clock is switched to on, but still nothing. do you think it could be the diverter valve, when i got there it was flashing SE which mean's it needs a service,cleaned the heat exchanger and burner with the proper worceter brush etc then re set boiler with technical, they also said it could be the built in clock and told me to disconect it, and just use the heating stat to control it.It still want fire.

Sep 03, 2008 | Air Conditioners

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