Riello RDB1 not firing up correctly?

techie

Hi,

I have a Riello RDB1 burner and it did not come on this morning when timed to.
Went out and Red lockout light on. Pressed it and it tried to start and then locked out again.

Bled the oil line and feed seems fine, after this , when I start it, it starts to fire up and I can hear the flame starting for about 2-3 seconds and then flame stops again and tries itself every 5-6 seconds, flame lights again but does not catch.

Anyone any ideas please?

Tom44

Possibly a dirty photo cell, which indicates it need a good service.

What area of West Cork are you in as I know a few good guys out west ?

techie

Cleaned the photo cell and still the same?

agusta

It could still be the photo cell,but my money would be on a partially blocked nozzle.so its getting less fuel and the air is blowing out the flame.
What you could try is partially block the air intake so that the burner is getting less air and see what happens.

techie

agusta wrote:

It could still be the photo cell,but my money would be on a partially blocked nozzle.so its getting less fuel and the air is blowing out the flame. What you could try is partially block the air intake so that the burner is getting less air and see what happens.

Thanks for this, is that the vent out of the top of the unit ?

agusta

What make of burner,it would be on the right hand side of burner,or post a picture

techie

agusta wrote:

What make of burner,it would be on the right hand side of burner,or post a picture

Rdb1 Riello

agusta

its on the right hand side of the burner ,to the front and under the cover,you will feel abit of suction when you put your hand partially over it when burner is trying to fire.

techie

agusta wrote:

its on the right hand side of the burner ,to the front and under the cover,you will feel abit of suction when you put your hand partially over it when burner is trying to fire.

Ok it fires up when I do that but stops when I try to put the cover back on. Service I assume now ?

agusta

it looks like too much air to fuel,it is more than likely a partially blocked nozzle.but it could also be slippage in your fuel pump,.Yes the boiler needs a service either way.The service will pay for itself with modern equipment which will increase the efficiency of your boiler.

What you could do if your stuck for heat until the service guy calls

On the front right hands side of burner you will see a dial with numbers on it,see can you locate it..

techie

agusta wrote:

On the front right hands side of burner you will see a dial with numbers on it,see can you locate it..

Yes it's set to 5 at the moment . How can I adjust it as I see it ratchets a valve closed

agusta

With a 3mm allen key inserted fully it will turn
with the burner trying to fire adjust it back towards 4 until the burner fires

techie

agusta wrote:

With a 3mm allen key inserted fully it will turn with the burner trying to fire adjust it back towards 4 until the burner fires

Thanks for that, out on a call myself now so will try it later , do you do call outs in West Cork by any chance ? 😀

agusta

I dont,Tom44 will give you the best man in your area for sure

techie

Thanks, that did the trick, it is currently running with that set to 4.
Whats involved in cleaning the fuel injector?

agusta

ok,lower the number to 3 and 3/4.
This is just a "stop gap measure" until you get a technician with a flue gas analyser to service it.asap.

The nozzles are not cleaned,only replaced,It also has to be the correct nozzle for your boiler.
The fault could also be slippage in the pump which would mean a new pump
The boiler service will pay for itself.set up correctly the boiler will run at maximum efficiency and increase the life span of the boiler.you should receive a printout of the emissions after the service

techie

The pump is a new pump fitted in April and the service guy checked it all then and gave it the green light.

I'll leave it at 4 and I have texted him and asked can he call out this week.

Many thanks for all your help here.

techie

Does he need to take the burner off the boiler housing to replace the nozzle as I know he said in April that he could not open the bolts holding it in place.

Tom44

techie wrote: »

Does he need to take the burner off the boiler housing to replace the nozzle as I know he said in April that he could not open the bolts holding it in place.

Only one simple 10mm nut holding the RDB in place.

Did your service man use a "flue gas analyzer" and give a printout from that machine with the readings of oxygen, carbon dioxide, carbon monoxide and boiler efficiency?

Without that equipment it is not serviced properly, self adjustment is equally dangerous from a fumes point of view if the boiler is indoors.

agusta

You need a different service technician!.Also one with a flue gas analyser.This is probally the reason your having problems
As stated earlier i would talk to Tom44 for advise on who to get.After all Tom is the top service guy in cork city

techie

Thanks both of ye for replying, he used one of those alright on the extractor cowling and said the readings were fine.

I did not get a printout though.

The boiler is in an outhouse vented to the open air and is not spewing out any smoke when its running even with the adjustment to 4.

Tom44

techie wrote: »

Thanks both of ye for replying, he used one of those alright on the extractor cowling and said the readings were fine.

I did not get a printout though.

The boiler is in an outhouse vented to the open air and is not spewing out any smoke when its running even with the adjustment to 4.

Thanks for reply.
We never know the situation without asking, luckily boilers give trouble from time to time, that's what keeps us in a job.
I'm pleased your service man has a FGA, without seeing your boiler were not in a position to judge why he couldn't remove burner.

ps. A clean burning boiler should have no fumey smell, if that helps.

techie

Fair enough, but for my own knowledge I assume the nozzle requires the burner to be detached to replace?

agusta

Yes,and also to clean and set up the electrodes and clean,check the combustion head of burner

techie

Back again, burner has been working perfectly since.
However this morning, no heating again.

Have checked oil coming in, fine.
Have checked Photo sensor, clean.

What is happening now, its on lockout when I get to it.
Press reset, motor runs to the point when I can hear the pump going and then 2 or 3 seconds later it goes back to lockout.

Am going to call service guy tomorrow but is there any quick trick I can try this evening to get heating in morning?

jimf

it may be a faulty photocell but on the rdb they rarely fail this way usually its stop/start with ignition or constant running of the motor without ignition

may also be pump issue again we cant tell without being on site sorry this is not what you wanted to hear

agusta

agusta wrote: »

it looks like too much air to fuel,it is more than likely a partially blocked nozzle.but it could also be slippage in your fuel pump,.Yes the boiler needs a service either way.The service will pay for itself with modern equipment which will increase the efficiency of your boiler.

What you could do if your stuck for heat until the service guy calls

On the front right hands side of burner you will see a dial with numbers on it,see can you locate it..

Techie,this was the advise given 7 days ago.It was only advise given to get you heat until the service technician called.Your burner has been running since but not running correctly. The advise was only a stop gap measure until the service technican sorted the problem,The burner was never going to keep running.

agusta

techie wrote: »

Back again, burner has been working perfectly since.
However this morning, no heating again.

Have checked oil coming in, fine.
Have checked Photo sensor, clean.

What is happening now, its on lockout when I get to it.
Press reset, motor runs to the point when I can hear the pump going and then 2 or 3 seconds later it goes back to lockout.

Am going to call service guy tomorrow but is there any quick trick I can try this evening to get heating in morning?

unfortunately,its a breakdown now,The quick trick last week worked for a week which was not bad at all

techie

agusta wrote:

Techie,this was the advise given 7 days ago.It was only advise given to get you heat until the service technician called.Your burner has been running since but not running correctly. The advise was only a stop gap measure until the service technican sorted the problem,The burner was never going to keep running.

Service guy rang then and was busy so agreed to wait a week . He is calling to me later today so hopefully wont be too expensive .

techie

Ok service guy called, new nozzle fitted, boiler cleaned out, fuel line checked and emissions checked.

Heating back on again now, so all good. Thanks everyone here for your responses.