Ideal Mini HE C24 - anti cycling???

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Hi,

I've been having problems with my Ideal Mini HE C24 combi boiler (see previous post). I recently fitted a new PCB and it appears to have sorted the problem i was having, however I still don't think it's quite right...

(I currently do not have it wired up to any kind of thermostat/programmer, I am just trying to get it operating correctly using the control switch on the front for now).

This is what is happening -

It appears to work normally when switched to water and heating, i.e. the boiler is active and the radiators get warm. When I then run a hot tap, I get hot water, no issues so far...

However when I turn off the tap the boiler shuts down for a couple of minutes, before firing back up and continuing to operate central heating as normal.

I've had a read of the manual and discovered a section titled "anti cycling setting" (no idea what this means...), where its states you can reduce this delay from 3 minutes to 30 seconds by moving dip switch 4 to the off position, which I have done.

So, my question is this -

Is this delay normal?
(I do not remember it doing this prior to changing the PCB, and my sister's Baxi boiler does not have any delay at all)

If it is a fault, what might be causing it and what can be done to fix it? Is it something I can fix myself or would I need to call a Gas Safe engineer out?

I don't think this problem will affect the overall operation that much, but I'd like to get it properly sorted whilst I'm on with it.

Any help would be greatly appreciated. Thanks
 
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Just a quick one to add my 10 pence worth.

The anti-cycle is a setting within the boiler to stop the boiler coming on and off rapidly if the temperature demands rapidly change. The anti-cycle would make the boiler stay off for a predetermined period after it reaches temperature. This could be adjusted if the manufacturers instructions stated but I wouldn't advise this.

You have a Combi boiler so any hot water demand would take immediate priority and it should fire straight away unless there is a fault.

I would imagine you have a faulty with a diverter valve or flow switch (or many other possible faults). Personally I'd advise its checked by a a RGI as you could end up changing loads of parts guessing.

Good luck.
 
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The anticycle delay is not adjustable on this model.

It is turned off by the dip switch but that is only an engineer's test setting and should normally be in the delay on position.

I dont really understand what you perceive as a problem.

Once the outlet temperature of the boiler has reached the set value then the boiler turns off for three minutes to prevent unnecessary short firing which reduces efficiency. Radiators hardly cool in three minutes.

Tony
 
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Thanks for your replies gents, I shall flick the switch back to the full 3 minute delay setting.

Agile -
I raised the query because I wasn't sure if it was supposed to be shutting down when switching back to central heating after running hot water, because I dont think it ever used to do that and my sisters Baxi doesnt...

As I only discovered this when testing it, the central heating was only on for a couple of minutes before I ran the hot water, so I wouldn't have thought the central heating outlet would've fully got up to temp (plus wont it have cooled a bit whilst the hot water was running...?), therefore should it not continue to fire with no delay when switching back?
 
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It is a little variable what it may do after running water.

The boiler temp sensor is already hot from just running hot water so usually does not need to fire immediately and then the anticycle takes over.

If you turned the hot water temp to minimum you might find it will remain running for central heating. But thats not your normal useage.

Different makes have different designs and so operate differently.

Tony
 
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That makes sense Tony, think I'll just let it be now.

So, I'm very nearly sorted and ready for winter, final job is to fit a new programmer/thermostat, any recommendations?

The existing one that has gone knackered is an old Drayton Digistat, I've heard they aren't the best and tend to go faulty...

I've had the name Honeywell recommended to me, had a look on their website and the CM921 or 927 seems to be the one I need, would you agree? Are there any cheaper alternatives you would recommend?

Thanks again

Andrew
 
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Salus are cheaper but don't have a good reputation for reliability.

But many of those complaints come from people who don't use proper Duracell batteries!

Tony
 
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