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

[farrellyheating]

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.

 

[townfanjon]

Is it throwing up a fault code ?

 

[snowhead]

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]

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.

 

[farrellyheating]

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]

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.

 

[townfanjon]

Before this thread continues, are you gas safe ?

 

[Danb]

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