Halstead CBX 24 Buner Lockout

[stelford45]

Hello
I had a new Halstead Eden CBX 24 Installed about 3 years ago and it has been working well until recently it started with the error burner lockout. The hot water works fine and the CH works until it get's hot and when it re-lights it goes to burner lockout.
So I called british Gas who quoted £164 to come out and fix it. In total they came out 5 times changing the gas value, PCB, electodes, burner seal, checked the flue and the waste pipe and eventually the engineer said he could not fix it as the problem persisted.
He advised I ring the manufacturer, which I did. They said they don't have an engineering.
Has anyone had this problem or any ideas how to fix, any thoughts are very welcome.
Many thanks

 

[gas4you]

When the reset light is glowing red, press and hold it for 3 seconds.

The reset light will then flash and led's 1 to 4 will show a fault code (from MI's)

What is this code?

 

[stelford45]

The fault code lights LED 3 and 4 which is.. Lockout Flame Signal / Lockout After 5 ignition.

Thanks

 

[gas4you]

Good old Halstead. Talk about stating the bl**ding obvious

 

[gas4you]

Seems like BG have replaced all the obvious causes of this fault indication.

Would it be possible for you to do the fault code test exactly when it goes off? I am wondering if there is an underlying fault that shuts it off, then it can't re-ignite, hence the code you are getting

Does this happen after it has been running for a while on ch then you turn a hot tap on for instance?

Have any of the ntc's been checked/replaced?

 

[stelford45]

It seem that this is the only error code coming up on the panel.
Never happens on the hot water only on the CH. Don't think any of the ntc's have been checked or replaced.
The BG engineer did say it worked better with the cover off!

 

[gas4you]

That could be significant! As a general rule, if a boiler works when the cover is off the combustion chamber it points to a fan/flue/aps fault, but sadly not 100% of the time.

Has BG checked any/all of these and cleaned the fan and venturis to eliminate these?

 

[stelford45]

As far as I know the BG never checked or cleaned the fan, he checked the flue. I'll have to ring them back tomorrow and request them to take a look at the fan etc.
Many thanks for your time and knowledge.

 

[zk]

The cbx24/32 does not have a fan venturi nor an air pressure switch. Which electrode did the BG person replace?

 

[stelford45]

He replaced both of them

 

[Deleted member 105431]

If BG didn't fix it then they should give you a refund. It does sound like there is a flue restrictor missing or a inner flue fault. BG are just part changers and have no diagnostic skills at all as this case demonstrates.

 

[gas4you]

The cbx24/32 does not have a fan venturi nor an air pressure switch. Which electrode did the BG person replace?

Thanks for that, I was getting carried away looking for a fault at a tangent. Forgot it was premix

 

[zk]

It could be any of the following, Has the gas valve been set up properly (CO2), is the gas pressure correct, is the seal for the flue on the top of heat exchanger correctly fitted, have both the electrodes been adjusted if required? It's no good changing parts. you're still required to carry out the necessary adjustments.

Khan.

 

[Agile]

I would say that its very risky for a BG man to replace the gas valve if he does not know what the fault is!

He then has the original fault plus a gas valve which might not be set up correctly. But it does not seem to have made any change which is lucky.

As it works fine on DHW then the gas valve should not be faulty. The problem only shows on CH when it modulates back I suspect. That should be quite easy to find.

Its a pity its so far away as these premixes are so reliable that I hardly ever get called to any genuine boiler faults.

Some people rush into changing parts without even doing the basics of checking the working pressure at the boiler inlet. That confirms there is gas present and shows if the gas valve is opening when expected.

Halstead have service agents all over the country and can arrange a joint visit with BG which will be paid for by BG if they have been unable to find the fault themselves.

Apaart from seeing that the fan is turning there is little that can be done to "check" it. There are several other things to be done to help diagnose the fault though.

Has the BG man done the obvious and checked the combustion conditions with a flue gas analyser? Large hand held instrument with pipes going to test points at the top of the boiler?

Tony

 

[stelford45]

The BG man tested all the pressures and the flue gas analyser, which were all ok.
I have phoned Halstead engineer who was supposed to get back to me to arrange a visit but never did. It's a bit out of his way about 60 miles away. Both electrodes were changed but not sure if they were adjusted just replaced I think.