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Discuss Help.. Intermittent oil boiler lock out ( moved from Central heating Thread) in the Oil and Solid Fuel Forum area at PlumbersForums.net

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Help .. Running out of options..
I have a client with a Grant vortex utility system 36-46 with riello burner.
There is about a 20metre 10mm oil line under ground from tank to a fire valve (vertical? ) then tigerloop, Then in through a 22mm duct into the property under passage about 2.5mts then into boiler room out behind an unvented cylinder round into back of boiler. 2 Pipe then back to tiger loop.
Flue is balanced flue straight up +/- 2mtrs through ceiling-roof
It started locking out every few days last autum. I services it and changed dirty bowl filter.
Went for a few days then locked out. I had a look and changed a stiff boiler temp control button and was fine all summer.
Then a few weeks ago started locking out again. They always reset it by the time i got there and it seemed to run like a dream while I was there. Checked combustion, fan movement, oil supply etc. about 2 weeks ago went out locked out and smell of oil - cracked top of tigerloop?
I then changed the tigerloop, flushed oil line ( few bits of sludge). Changed pump, drive dog and capacitor. Checked photo cell..
All ran fine for a week then this morning locked out again. Going back tomorrow to have another look.
I had a suspicion about the fire valve being vertical and no filter just before it. Problem is there is no room to install a filter where it comes out ground and to make fire valve horizontal.
What is the affects of a vertically installed fire valve.
Any Suggestions where to check next.?
Is it only a fault in the burner that can cause a burner lock out?
If there was a thermostat fault could that cause lock out or just over heat stat...?
or poor flow through system...?
Any suggestion welcome
 

Best

Esteemed
Plumber
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