Onan 5500 Marquis Gold - GAS, Generator Issue
Over Thanksgiving I took my toy hauler out to the dunes and got the chance to use my newly installed (replacement) secondary A/C unit, as a couple of the days got kinda warm.
The unit is supposed to be the same as the main "house" unit, just without the remote thermostat. We tested the new unit at the dealer on SHORE power, and it seemed OK.
I started the gen, let it run my normal 1 minute giving the transfer switch time to switch over from SHORE (even though I was dry camping - shore power is the default), then tested out the new A/C.
I flipped the switched and it ran for about 2-3 seconds, and shut down, at the same time shutting down pretty much half the power in my RV.
I checked all the breakers in the panel, and generator, all were on and switched. I turned off the gen, flipped the breakers a few times, and restarted no change.
I then turned it off again, and tested with a small 2000w external generator, I had power to all services in the rig (could not test A/C as the little gen would not run those, but I did have power them)
Shut off the little gen, and tested the big gen again, same issue... no power to half the rig.
Opened up the cover on the IOTA transfer switch, and measured the voltages, and found that 1 of the 2 HOT legs have no power despite all breakers being OK, and no codes being shown by the generator, I am unable to tell if that is incoming or outgoing from the transfer switch, but I THINK its the incoming HOT1 and HOT2 from Generator.
I also opened up the panel in side the rig, and tested the voltages there, and one side of the 50 amp 2 way circuit is dead.
When I got home, I opened up the generator circuit breaker cover, and checked them for continuity, and they both checked out. Did the same thing at the inside distribution panel as well.
I am not sure if there are further circuits behind the breakers at the generator, I would think they are in place to protect the genset itself.
I am thinking something went wonky inside the generator, or the IOTA transfer switch, via an overdraw with the newly installed A/C, as before it all was good.
Any thoughts?
The unit is supposed to be the same as the main "house" unit, just without the remote thermostat. We tested the new unit at the dealer on SHORE power, and it seemed OK.
I started the gen, let it run my normal 1 minute giving the transfer switch time to switch over from SHORE (even though I was dry camping - shore power is the default), then tested out the new A/C.
I flipped the switched and it ran for about 2-3 seconds, and shut down, at the same time shutting down pretty much half the power in my RV.
I checked all the breakers in the panel, and generator, all were on and switched. I turned off the gen, flipped the breakers a few times, and restarted no change.
I then turned it off again, and tested with a small 2000w external generator, I had power to all services in the rig (could not test A/C as the little gen would not run those, but I did have power them)
Shut off the little gen, and tested the big gen again, same issue... no power to half the rig.
Opened up the cover on the IOTA transfer switch, and measured the voltages, and found that 1 of the 2 HOT legs have no power despite all breakers being OK, and no codes being shown by the generator, I am unable to tell if that is incoming or outgoing from the transfer switch, but I THINK its the incoming HOT1 and HOT2 from Generator.
I also opened up the panel in side the rig, and tested the voltages there, and one side of the 50 amp 2 way circuit is dead.
When I got home, I opened up the generator circuit breaker cover, and checked them for continuity, and they both checked out. Did the same thing at the inside distribution panel as well.
I am not sure if there are further circuits behind the breakers at the generator, I would think they are in place to protect the genset itself.
I am thinking something went wonky inside the generator, or the IOTA transfer switch, via an overdraw with the newly installed A/C, as before it all was good.
Any thoughts?
