DHW - Halstead ACE


Postby daveyboy » Thu Apr 16, 2009 10:30 am

Hi

I have a Halstead ACE boiler. :?
After long draw offs of hot water the boiler will lock out due to overheating. I have recently changed the secondary heat exchange to resolve another issue but can't be sure why the boiler is now overheating.

I suspect that after a run of hot water, the boiler is supposed to divert the remaining hot water into the central heating system so that it doesn't remain in the boiler but this doesn't happen.

Can any one tell me if my suspicion is correct? What controls it?
Or what the problem is if I'm way off base?
daveyboy
Posts: 4
Joined: Thu Apr 16, 2009 10:08 am

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Postby Steve the gas » Fri Apr 17, 2009 4:47 am

Hi,

Diverter valve, but could be other things tho
Steve the gas
Posts: 780
Joined: Sun May 04, 2008 7:07 am


Postby daveyboy » Sat Apr 18, 2009 9:23 am

Hi Steve

Thanks

I can't find a diverter valve in the manual :shock:

Is it known as something else?
Is the flow switch the same thing?
daveyboy
Posts: 4
Joined: Thu Apr 16, 2009 10:08 am


Postby daveyboy » Wed Apr 22, 2009 12:42 pm

Any help still appreciated!! :?
daveyboy
Posts: 4
Joined: Thu Apr 16, 2009 10:08 am


Postby Steve the gas » Thu Apr 23, 2009 4:40 am

Do you have the manual?
If not contact the manufacturer - they will email it.
Follow the fault finding guide if you are going to attempt the repair.If not get an RGI by recommendation.
Steve the gas
Posts: 780
Joined: Sun May 04, 2008 7:07 am


Postby daveyboy » Fri Apr 24, 2009 9:15 am

Hi Setve,

Yes I have the manual

The fault finding section for hot water is for checking the start up procedure and ignition sequence. Both of which work fine.

It doesn't however explain what should happen when the demand for hot water stops.

The only reference it makes to the system going into overheat lock out is to check the secondary heat exchange for debris and replace.

However, this problem has started happening since replacing the secondary heat exchange. It's difficult to know if it would have happened before replacing, as I didn't have hot water.
daveyboy
Posts: 4
Joined: Thu Apr 16, 2009 10:08 am


Postby Steve the gas » Sat Apr 25, 2009 4:16 am

Could be diverter sticking/ microswitch get a good RGI on the case
Steve the gas
Posts: 780
Joined: Sun May 04, 2008 7:07 am


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