Buderus G215 cutting in and out

mo1

I have a Buderus Logano G215 with a Riello R 40 F5 burner. It's been working great, but now the flame has started to cut off before reaching temperature. The fan will sometimes keeping running and the unit will fire back up. It does this intermittently. So sometimes it runs a complete cycle and closes down correctly, sometime it will cycle through purge/flame 3 or 4 times, and other times somewhere between these two end members.

I've had the guy who installed it in to look at it, but it appears to be beyond him.

There really isn't any one near me that appears to be qualified to trouble shoot the issue.

Any suggestions as to how to trouble shoot this would be greatly appreciated.

Big Ed_4

Cover the air shutter partly with your hand , if the fire does not drop out , the nozzle or adjustments are bad .... Prime that overhead oil line though the pump, check for any air ... The flame seems like it's dropping out ....

mo1

OK thanks Big Ed. I will give that a try in the morning. I had just replaced the nozzle ( as well as had a cleaning) so there may be some air in the line.

Not sure if this is related or not, but there is a very small drip of fuel. Maybe 1/2 tsp / day. If it's dripping at times, might it also suck at other times?

mo1

I can't seem to see where the drip is coming from. There is oil mist on the back panel of the covering box. (the black section of the cover that remains attached to the burner when you remove the cover). But I can't seem to locate a source of it.

BDR529

Overhead line.. Riellos don't like to pull fuel. If you maintain a siphon to feed the pump (after the filter at union) then your good.

Got a tank of Bio? carboned up retention head?

mo1

Hi BDR529: There is an excess of 9' of head on the oil line.

STEVEusaPA

If you're dripping oil, your most likely sucking in air. Fix you vacuum leak, power bleed the fuel system.

mo1

Big Ed_4: I covered the air intake. The flame sound became a muffled rumble as opposed to a roaring fire. You could hear the flame struggling to find oxygen, but it didn't shut off. What do you make of that?

Big Ed_4

Just had a cleaning ? Wrong nozzle or wrong adjustment . I would be looking for .. Buderus is a tuned boiler .. Use the setting and nozzle for the boiler .....

mercedes

just a thought make sure the fuel oil is clean and no water. I had the same situation and bad fuel. See my past post.