Baxi Combi 105e dies on Central Heating after 3 seconds?

[jurassic]

Our Baxi 105e has failed on us after many years of good service

Symptoms:

DHW works ok - burner lights - all good.

Central Heating not working:

* Burner lights and then flame dies after about 3 seconds of being lit
* Flame failure LED is displayed on control panel ( flashing )
* Can be reset and then fails again after 3 seconds and so on
* System pressurised correctly

This fault appears have started after our power being off for several hours.

I'm trying to pre-arm myself with some knowledge before I have to get the professionals in so appreciate any suggestions as to the possible cause.

 

[ianmcd]

Try running a hot tap near the boiler untill the flame is established, then reduce the flow of the HW at the tap to atrickle and see if the burner goes off then comes back on , or goes to flame lockout

 

[martyndc88]

When was the last time it was serviced

 

[jurassic]

Try running a hot tap near the boiler untill the flame is established, then reduce the flow of the HW at the tap to atrickle and see if the burner goes off then comes back on , or goes to flame lockout

Thanks Ian, yes on DHW I can reduce to a trickle till flame off and then increase flow and flame will reignite successfully.

When supplying DHW a fair but of clunking going on - flame going on full and then reduces and back up and so on but no flame failure.

Central Heating however as per my original post fails after about 3 seconds - burner ignites and then dies to flame failure.

 

[jurassic]

When was the last time it was serviced

About 5 years ago - so maybe I am deserving of my problem!

 

[ianmcd]

Nothing coming to mind , can you post a video of it locking out and showing all the leds, and another of the noise when running HW please

 

[jurassic]

Nothing coming to mind , can you post a video of it locking out and showing all the leds, and another of the noise when running HW please

I'll try and capture this later today and post .. thanks

 

[martyndc88]

About 5 years ago - so maybe I am deserving of my problem!

**********

Does your flue go up and out the roof or straight out the wall

 

[jurassic]

burner pressure - not something I can check myself

- why would burner pressure not also affect the DHW?

The flue goes up and out of the roof ...

 

[martyndc88]

**********

Does your flue go up and out the roof or straight out the wall

Hardly advice in DIY gas work.didnt tell him how to check it!

But no you can't check or alter that your self. You'll have to get someone to check that who is competent.

The older flues on these can crack internally.

 

[jurassic]

Nothing coming to mind , can you post a video of it locking out and showing all the leds, and another of the noise when running HW please

I know this has been some time - still trying to get my Baxi 105e combi boiler fixed

There was an issue with my flue ( internal clip broken ) which has been fixed with the help of a local plumber.

However although this has improved the efficiency and operation of the DHW the central heating still fails when it receives a demand.

Would appreciate if anyone can offer any suggestions as to what may be going on - as per embedded clips below?

Central Heating failing

Central_Heating_Failing - video dailymotion

• jurassic
• 23 Sep 2019

Baxi 105e Central Heating Failing

DHW working

How Water Working - video dailymotion

• jurassic
• 23 Sep 2019

Baxi 105e - How Water Working