boiler locks out , complete service and parts change

[gogger b]

problem with my oil boiler everything has been change all cleaned out set up but still locks out , if I remove photcell and shine a light on it it runs fine replace photocell and it stops again , new cell and control box, heating engineer is beat now as well

 

[Deleted member 120897]

I’m not an oily, but if it works when you apply light, I’d be looking in that area. Either faulty photo cell or not enough light?

 

[John.g]

Might be seeing a false flame, to test, keep light shining on the removed photocell before trying to fire up, it should lockout and not fire up.
Make of boiler/burner?.

 

[SimonG]

Yep, give us an idea of the boiler and burner.

Need a new boiler man as well if they're stuck with this.

 

[gogger b]

I’m not an oily, but if it works when you apply light, I’d be looking in that area. Either faulty photo cell or not enough light?

new cell fitted and still the same , chamber all cleaned, new nozzle and good spark

 

[SimonG]

What co2 and excess air is it running at?

 

[gogger b]

Yep, give us an idea of the boiler and burner.

Need a new boiler man as well if they're stuck with this.

grant vortex 16/21 riello burner

 

[gogger b]

Might be seeing a false flame, to test, keep light shining on the removed photocell before trying to fire up, it should lockout and not fire up.
Make of boiler/burner?.

cell works exaclty as it should when out but locks out everytime when in position grant vortex 16/21 riello burner

 

[gogger b]

What co2 and excess air is it running at?

cant answer that has boiler man has given up and left

 

[gogger b]

grant vortex 16/21 riello burner

grant helpline say its a combustion issue but when we trick it to go it burns well fires up lovely and runs fine

 

[John.g]

cell works exaclty as it should when out but locks out everytime when in position grant vortex 16/21 riello burner

All oil boilers check for a stray/false flame before allowing the boiler to fire up, so if you have the cell out and you have a light shining on it before you press the start button then it shouldn't fire up, can you check this out.
To fire up with the cell removed, it has to be covered during the purge period which on my 17 year old Firebird (Riello G5X burner) is 12 secs, the ignition transformer is then energised and the solenoid opens the oil valve and a flame must be detected within 5 secs, so if you shine the light on it after 12 secs it may light up and allow the burner to continue firing, For safety reasons you obviously don't keep it running in this fashion, as soon as you remove the light or blind the cell then the burner should trip with the combustion failure light illuminated.

 

[SimonG]

grant helpline say its a combustion issue but when we trick it to go it burns well fires up lovely and runs fine

Grant are correct, it won't be fixed without the correct equipment.

 

[exedon2]

As SimonG has said you need correct equipment.
Riello's own fault finding chart states photocell is very difficult to test without a lux meter. If you suspect it change it.
Out of interest how old the boiler?

 

[Timmy D]

Does it have a flame diffuser? Original problem could have been a spot clogged diffuser, which is now clean but has been reinstalled upside down. His prevents the light getting to photocell.

This is not specific to your boiler/I don’t know what the diffuser looks like on your boiler but have come across this before on bigger Riellos.