boiler wont fire

sanbrafyffe

hi all i have a firebird boiler with a riello burner,,,wen i turn on at clock it wont fire

you can hear noise alright which could be the pump wired to the time clock and maybe the fan if im ciorrect

theres over 1 bar in the system

hit the stat reset and manual flame up button but nothing

any suggestions or help on the process of boiler start up

cheers b

DGOBS

Firstly, do you have voltage to the burner? (220-240v ac)
If not, problem is back on the stat,overheat stat, or controls (timeclock/room stats/mv's)

If you do have, is the red lockout light lit?
Yes, the press re-set and see if it starts

Further from that, if the motor does not star (but you can hear it buzzing)
Check the capacitor has the correct charge, remove the pump and check the drive shaft is free (if not pump has had it)
then check the motor turns freely, if not (if not motor has had it)

More than that, I would need more detail...

sanbrafyffe

no the motors fine,,,the water is pushing away throught he system,,,,so this eliminates the heat stat situation too,,,theres loads of oil,,too,,,ive reset the stat,,,hit the lockout,,manual start buytton,,,,,noting,,,fan is running i think

DGOBS wrote: »

Firstly, do you have voltage to the burner? (220-240v ac)
If not, problem is back on the stat,overheat stat, or controls (timeclock/room stats/mv's)

If you do have, is the red lockout light lit?
Yes, the press re-set and see if it starts

Further from that, if the motor does not star (but you can hear it buzzing)
Check the capacitor has the correct charge, remove the pump and check the drive shaft is free (if not pump has had it)
then check the motor turns freely, if not (if not motor has had it)

More than that, I would need more detail...

miller50841

Clean the eye of the burner.
Where the fuel is burned can get very dirty take the unit out clean inside boiler and bleed the fuel after just to make sure no air bubbles

DGOBS

If the fan is running (ie. the motor started) and it just runs and runs without actually firing up then it's 3 possible faults

a) the photocell - to check remove it altogether and run the burner, it should fire after 12 seconds the lockout within 5 more seconds, if this happens with it removed, it's faulty, change it
b) if thats ok, your going to have to check the resistance of the solenoid coil to check for correct ohms, if not correct or open circuit, replace
c) if both above are ok, it's a control box problem, replace

Remember the above is based on a riello burner in constant pre-purge mode (i.e., motor runs on past 17 seconds without attempting to fire)

DGOBS

The 'eye' PHOTOCELL is dirty would cause the burner to go to lockout
A lack of oil would cause the burner to go to lockout

Neither of these are the issue the OP has reported?

If your photocell is getting dirty your boiler is incorrectly setup and not burning fuel efficiently, have is serviced by a qualified technician

shane0007

One other, but rare one, is a faulty motor sending an incorrect voltage back to the control box (white cable). This will also lead to continuous running without going to lock out.

DGOBS

So rare I forget about it (50v on white wire)

shane0007

DGOBS wrote: »

So rare I forget about it (50v on white wire)

Correct! I have only seen it happen once.

jimf

first make sure the noise u hear is a low hum from the motor not
the circulating pump if ur sure its motor noise remove fan cover housing
and assist motor by turning fan (be careful it may start suddenly)
use piece of wood not ur hands if it starts ur problem is most likely
motor capacitor if it doesnt den ur oil pump is most likely the problem

DGOBS

Or you could just test your capacitor with the correct test equipment, and keep your fingers attached to your hand!