Scribsheating
I have been having a problem with the unit going into lock-out on low oil. I started out by changing oil and filter. Next I decided to have a company out to check out unit. On the first visit they changed pressure switch and said I was good to go. It faulted the next day. They came back and changed the circuit board next and said I was good to go. It faulted about 3 hrs after they left. They came out for a third time today and changed oil and thought maybe something was plugging pressure switch. Also they put my old board back on because it wasn't the problem. About 2 hrs after they left I switched it on and it faulted on low oil again. They have checked pressure and it is holding steady at 35psi according to them. It does not happen every time it starts up so it makes it hard to trouble shoot. I do hvac for a living and I understand sometimes its hard to fix intermitten problems, but I have a sump pump that has to run no matter what and I have to get this fixed. So any advice would be appreciated!!
also the invoice said they checked wire 86 for continuity from oil switch to board and said it was good. model#0052510 serial#4731610
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techntrek
Is this happening during certain conditions, like below a certain temperature? Mine (a 4456 12 kw) throws a low-oil condition below roughly 30 F. But if I immediately restart it, it runs fine. New pressure sensor did not help mine either, some here have suggested a possible problem with the oil pump but now its is too warm for me to do any more testing.
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MacMan
Where are you located? What type and weight of oil are you using? What brand oil filter? Is this a brand new unit, and if not, how old?
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johnc
"T" in a pressure gauge parallel to the oil pressure sw. No different than checking oil pressure on a semi hermetic. Wire in parallel to the OPS a delay on break or delay on make, which ever is applicable, time delay relay. If the unit has no trouble coming up to proper oil pressure, an additional seconds delay for the PCB may help figure out your problem. Would think you would have all parts on your service truck. One nice advantage to running hvac service.
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scoot
Install a pressure gauge and start the unit. The control board has about a 5 second delay to allow the pressure to get above 8-10 psi. The pressure should be between 30-40 psi. Look for any large fluctuations in preesure after oil is warm. You may have to start and stop the generator 15-20 times, to see a starting pressure stay around 8-10 psi or dip lower. If pressure does not go above 4 psi in the 5 seconds turn gen off. If you see the pressure stay around 10 psi after starting unit, the wave washer inside the engine is bad and needs to be replaced.
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Geoff Z
Ask your dealer to research the "wave washer replacement". Generac released a SIB on it in August 2010. SIB-10-13-HAC
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