I have a Worcester Bosch boiler with a Riello burner. The boiler became sooted up and blew up damaging the door to the combustion chamber. I have cleaned out the chamber and all other sooted areas. Now I can get it to run from cold but once it reaches temperature and turns off it will not reignite. The fan and fuel pump run continuously but the oil pressure doesn’t rise above 2bar. I havE replaced the photocell. Is this a solenoid coil issue ??? A solenoid issue or something else. If I leave it the fuel pump becomes hot but no fuel reaches the nozzle.
Riello burner
- Thread starter Drsmb
- Start date
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- fuel pump riello burner
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Clear pictures of your burner Riello make more than one!
Which model worcester again more than one.
Are you saying burner runs continuously without fireing?
Plus it's never going to run correctly till that door is sorted.
Which model worcester again more than one.
Are you saying burner runs continuously without fireing?
Plus it's never going to run correctly till that door is sorted.
We avoid Worcester's like the plage now refused to both fit and service the later ones.
Have pulled a good few out leaking at 5/6 years the bigger downward fireing ones see very prone to leaking.
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Haven't seen those issues here in norfolk. warmflow with the exchangers rotting through halfway up the main exchanger and grant slave cylinders on external models are my main problems.
Leaking on the down firing worcesters on the secondary plastic exchanger casing have normally been down to oversized boilers. the combi versions leaking on the hydroblocs on later worcesters has always been down to no shock arrester or mains pressure above 8 bar. But that is an install error not the boiler.
Have had quite a few oil boilers with the riello rdb bx burner have problems with the oil pump melting the internals.( seems to be a problem with those setup at 10.0 bar pressure with the boiler sized correctly to the property. The longer running times get the pump very hot. increasing the output and dropping pressure to 9.0 bar has solved this problem. )
Leaking on the down firing worcesters on the secondary plastic exchanger casing have normally been down to oversized boilers. the combi versions leaking on the hydroblocs on later worcesters has always been down to no shock arrester or mains pressure above 8 bar. But that is an install error not the boiler.
Have had quite a few oil boilers with the riello rdb bx burner have problems with the oil pump melting the internals.( seems to be a problem with those setup at 10.0 bar pressure with the boiler sized correctly to the property. The longer running times get the pump very hot. increasing the output and dropping pressure to 9.0 bar has solved this problem. )
The boiler is a Worcester greenstar 25/32. It’s just been serviced in the last month.m not with boiler so can’t see model of Riello burner. Yes the fan keeps funding all the time. No fuel goes through. I now have the solenoid coil with me and that has a resistance of 97.7 ohms. Which the Worcester video says is in range. Intermittently the pressure goes up to 100 psi it sparks and runs but when it turns off it won’t restart and I’m back with a low pressure and the fan spinning away. I bought a oil pressure gauge so pressure readings are exact.
this needs to be fully cleaned. both the main exchanger and the secondary exchanger. it then needs the burner to be cleaned and have a new nozzle and be setup correctly using an anaylser. this is not a diy job. This is most likley caused due to boiler not being serviced reguarly . ( max about 14 months with these new semi blue flame boilers) i can see from the picture that someone has been adjusting the nozzle length and this is way out so will need to be setup from scratch
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The boiler was serviced november . These pictures were before I cleaned it, both outside and inside, including both exchangers and the burner. The engineer who serviced it said he would not touch it again since it blew. The boiler is only three years old. I have access to an analyser and pressure gauge. I will look at nozzle length but this is where the engineer left it. What I need to know is why the fan keeps running and why I only get high oil pressure intermittently. I have just checked the coil resistance in Hot water and it went up to 118 ohms.
These semi blue flame burners can be setup wrongly even with an analyser.
There are a number of potential issues with the setup.
You have changed the photocell? Put the old one back in as a guess you have fitted the wrong type.
Send us some updated pictures of it all cleaned. Main exchanger, secondary exchanger, condensate trap, burner with blast tube removed, burner fan,
Picture of oil pump with filter casing removed, fuel filters.
Original photocell
New photocell you tried ( both showing the codes )
New nozzle required
Head distance needs to be set to correct length
Also need to check that electrode holder is in correct location so photocell can see flame.
Oil pump pressure checked
Air damper setting set at factory setting ( so you can be closer to where it needs to be so it will run and then can be adjusted)
There are a number of potential issues with the setup.
You have changed the photocell? Put the old one back in as a guess you have fitted the wrong type.
Send us some updated pictures of it all cleaned. Main exchanger, secondary exchanger, condensate trap, burner with blast tube removed, burner fan,
Picture of oil pump with filter casing removed, fuel filters.
Original photocell
New photocell you tried ( both showing the codes )
New nozzle required
Head distance needs to be set to correct length
Also need to check that electrode holder is in correct location so photocell can see flame.
Oil pump pressure checked
Air damper setting set at factory setting ( so you can be closer to where it needs to be so it will run and then can be adjusted)
1) photocells have slightly different numbers . See photo. They are the same length. Error occurs with both.
2) head distance I have now set to 5 mm
3) oil pump pressure set to 100 psi.
4) waiting on new nozzle
I measured the voltage into black control box which was 239V but I couldn’t get a voltage going to the solenoid coil. I tried with both photocells exposed to the light.
Black box was very dirty inside , this could be an issue since carbon is a great conductor.
2) head distance I have now set to 5 mm
3) oil pump pressure set to 100 psi.
4) waiting on new nozzle
I measured the voltage into black control box which was 239V but I couldn’t get a voltage going to the solenoid coil. I tried with both photocells exposed to the light.
Black box was very dirty inside , this could be an issue since carbon is a great conductor.
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you have altered the burner to the completely wrong settings. those are for a non bx burner head.
you need to alter to these.
0.75/80/eh nozzle
10.3 bar/150psi oil pump pressure
combustion head depth at 19mm. you have to use the special tool to set this
air shutter start at 4.25 and adjust to get 12.0% co²
you need to alter to these.
0.75/80/eh nozzle
10.3 bar/150psi oil pump pressure
combustion head depth at 19mm. you have to use the special tool to set this
air shutter start at 4.25 and adjust to get 12.0% co²
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