Firebird C26 - intermittant firing

[rsparker1980]

Hi there,

Firebird enviromax combi c26.

Reillo RDB burner

When boiler is switched on green light for hot water lights up on front panel. The dhw pump switches on, so does the burner fan. The heat bank is not up to temperature but the burner does not fire. The pump, & burner fan continue to run without the burner going to lockout.

Have removed photocell to check if clean from soot & ok.

Customer says the boiler has been working fine but occassionaly gets this problem.

Any ideas? I suspect photocell. Can these cause intermittant firing problems?

 

[oilhead]

Yes.
Unplug the photocell from the control box. You'll probably find that it then fires up but then will go to lockout.
Do you not carry RDB photocells if you are servicing boilers?

 

[rsparker1980]

Thanks alot for your advice oilhead. I will try this on my next visit. Never even thought of that. The boiler has been working fine since my last visit according to customer.

I agree - should have had a RDB photocell on stock. Poor stock replenishment on my part. New stock delivered yesterday thankfully.

Thanks again - will keep you updated.

 

[Boilerman2]

This is a VERY common fault on the Riello RDB I have probably replaced at least 40 Photocells in the last twelve months.
Riello Burners behave in a completely diffrent way to other similar burners, a constantly running fan with no light up is caused by either a failed photoresistor, a failed Solenoid Coil a failed control box or a faulty motor (no 50vac output on white wire)

 

[dcawkwell]

Thanks alot for your advice oilhead. I will try this on my next visit. Never even thought of that. The boiler has been working fine since my last visit according to customer.

I agree - should have had a RDB photocell on stock. Poor stock replenishment on my part. New stock delivered yesterday thankfully.

Thanks again - will keep you updated.

That is nothing. Most of the oil engineers around here don't carry any
oil boiler parts with them. I have probably more oil parts than all the plumbers in 20 miles of me.

 

[rsparker1980]

Thanks Boilerman2, i am very grateful for your knowledge on the Reillo RDB burner. The experience you have gained will help me going forward when fault finding on this model of burner.