Unit was installed October 2010.
About a year ago the unit started to act up. One of the mechanics decided he would fix it but seemed he managed to get it to limp threw the rest of the winter months.
What I found was the fire box filled with brown ash, quad ring mashed up, leaking preheater block, and filter in take clogged, lines blocked up and the preheater and air heater all blocked up and lower preheater element burned out with a hole in it.
It took some time but cleaned everything down to bare metal. cleaned filters, lines, regulator, and pump screen. replaced all O-rings. Installed new quad ring and preheater.
There seemed too be a missing oring between the lower and upper block I found a 1/2 inch OD 1/16th oring that seems to be correct.
First try I had spark but could tell no oil, took it back apart and found I missed a blockage in the upper half right were the oil goes in from the lower block.
After cleaning it again the unit will only light if you turn the air pressure down to about 10 psi. I've been on the phone with Lanair and they state that 10 psi will not over come the oil shut off plunger and air diaphragm to allow oil to flow. However it will light only this way, and the blower shutter is almost closed.
Watching the target brick I see drops of oil hitting it and burning off. I'm stumped and Lanair seems stumped as well, stating the air gauge on the regulator might not be right. I believe it is. I'm not sure what I"ve missed but open to any and all suggestions.
Just a run down, disconnecting feed line and running unit, oil does not blow out the feed port on the burner, there is a slight suction. So from what I'm told there is no air leaks between oil and air passage (quad ring new). Bypass regulator seated and pump running I get a flow rate of about 1 gal in 5 mins at the feed. It doesn't make any sense, and don't wish to run the unit and risk target brick or fire box damage.
