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seeking experienced advise on an intermittent fault on ideal logic combi?

My own boiler at home has developed an intermittent fault causing an ignition lock out every week or two when there is a demand for hot water. When reset the boiler runs without issue for a week or two. This fault only occurs on HW demand, there has never been a lock out on CH demand. Ideal tech support can only advise carrying out a full strip down service, ensuring gas pressures are ok ( which I've done twice) . Any advice would be appreciated. Thanks in advance.
 

snowhead

Esteemed
Plumber
Does it fire and lock out or does it go straight to lockout as it's firing?
Is it always similar times. i.e first use in the day or after frequent use?

Don't get too hung up on it only apparently locking out on HW, basically your boiler is locking out every week or 2 and it may be a coincidence about the H.W
 

RoryD

Plumber
Gas Engineer
Pretty scant info so far. Just do all the basics. Check pressure drop across the system on demand. Gas rate. Flow cup. If you don't know what it is you can certainly ascertain what it isnt.
 
Ok. Thanks for the replies. So no fault code, just ignition lock out. It can happen at any time of the day. Now that the colder weather is here my heating is back on. Any time CH is called for or manually switched on it fires up with no issues. When the heating is running and there is a HW demand there are also no issues. Could be coincidence but it has only ever failed to fire on HW only. I don't know at what stage the lock out occurs as when it's reset it runs with no issues so I've never actually been able to witness it.
 

RoryD

Plumber
Gas Engineer
Ok. Thanks for the replies. So no fault code, just ignition lock out. It can happen at any time of the day. Now that the colder weather is here my heating is back on. Any time CH is called for or manually switched on it fires up with no issues. When the heating is running and there is a HW demand there are also no issues. Could be coincidence but it has only ever failed to fire on HW only. I don't know at what stage the lock out occurs as when it's reset it runs with no issues so I've never actually been able to witness it.
On reflection the boiler likes to initially guzzle a lot of gas to ignite. The meter governor may be sticking but I think you really should be looking at working pressures / gas rates.
 

Danb

Gas Engineer
Combi I take it, I have an ideal at home and had a strange issue.
I'll let u know what the issue was if you can answer the question above
 
Before this thread continues, are you gas safe ?
Yes but not a great deal of experience with domestic boilers
[automerge]1574453569[/automerge]
Combi I take it, I have an ideal at home and had a strange issue.
I'll let u know what the issue was if you can answer the question above
Yes. Gas Safe.
Combi I take it, I have an ideal at home and had a strange issue.
I'll let u know what the issue was if you can answer the question above
Reg no. 133686 ??
 

garygvl

Gas Engineer
Ok. Thanks for the replies. So no fault code, just ignition lock out. It can happen at any time of the day. Now that the colder weather is here my heating is back on. Any time CH is called for or manually switched on it fires up with no issues. When the heating is running and there is a HW demand there are also no issues. Could be coincidence but it has only ever failed to fire on HW only. I don't know at what stage the lock out occurs as when it's reset it runs with no issues so I've never actually been able to witness it.
if its gone to ignition lockout with no fault code how do you know its gone to ignition lockout, it will have a fault code you have to reset, could go further but wont at this moment. first question logic or logic plus, different displays. move to gas safe area then can advise more
 
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ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Op send me your gas safe number in a pm and a pic of your gas safe card and I will sort the rest

Also in the mean time can you get your post count passed 10 please
 
if its gone to ignition lockout with no fault code how do you know its gone to ignition lockout, it will have a fault code you have to reset, could go further but wont at this moment. first question logic or logic plus, different displays. move to gas safe area then can advise more
It's a logic +. The display reads "ignition lockout check other gas appliances" no code.
 

Danb

Gas Engineer
Mines a c30 plus.
Kept having peculiar things happening to it.
It was under warranty only 2 years old.
I installed.
So I got ideal out turns out the thermisters where dropping in and out between swichnover.
To fast to notice had to be plugged in to show when it dropped out . It was that fast enough to confuse the boiler.
[automerge]1574504952[/automerge]
New thermisters been ok since
Might help
not to expensive to change either
[automerge]1574505112[/automerge]
Mine also played up when running the boys bath.
 
Mines a c30 plus.
Kept having peculiar things happening to it.
It was under warranty only 2 years old.
I installed.
So I got ideal out turns out the thermisters where dropping in and out between swichnover.
To fast to notice had to be plugged in to show when it dropped out . It was that fast enough to confuse the boiler.
[automerge]1574504952[/automerge]
New thermisters been ok since
Might help
not to expensive to change either
[automerge]1574505112[/automerge]
Mine also played up when running the boys bath.
Cheers for the advice. My issue only occurs when there is a demand for HW when the boiler is off? Do you reckon thermistors would be the first change?
 

scott_d

Plumber
Gas Engineer
Whats your inlet pressure?
Spark generators are quite a common part to fail
Gas Valve
Meter regulator?
 
Whats your inlet pressure?
Spark generators are quite a common part to fail
Gas Valve
Meter regulator?
I was thinking if it was the spark generator I'd be getting a lock out on CH as well but I never do. I was thinking gas valve or fan as these are modulating on HW demand but I'm not sure. Inlet pressure is 19.5.
 

scott_d

Plumber
Gas Engineer
I was thinking if it was the spark generator I'd be getting a lock out on CH as well but I never do. I was thinking gas valve or fan as these are modulating on HW demand but I'm not sure. Inlet pressure is 19.5.
Is that at max rate?
Does it dip at all on initial fire up?
 

scott_d

Plumber
Gas Engineer
Cleaning the brass Venturi
Washing through the heat exchanger
Checking spark gap
Cleaning the condense trap and rubber hose are part of Ideals ‘full service’
 
Cleaning the brass Venturi
Washing through the heat exchanger
Checking spark gap
Cleaning the condense trap and rubber hose are part of Ideals ‘full service’
Yes. All done. All advised by Ideal tech support but had an ignition lock out a week later. Reset and everything is fine for a week or two then it reoccurs.
 
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