I have a new Generac 8kw generator with an auto 123 circuit transfer switch. It will start in manual mode but when I test the auto mode I turn main power off at utility and the generator will only crank but not start. Im using Lp gas. please help me find solution.

Check the wiring from the utility through to the autostart control.; make sure all connections are solid and the wire itself is in good condition. New wire is no guarantee, several times I've had wire with a break somewhere in the reel. A non-contact voltage detector may helpful; start at the controller end, go to the other end of the wire, and see where you lose the voltage detect. It will detect voltage up to the break if you can keep the detector close enough to the wire.

Turns out it was the Manual-off-Auto switch that was bad. My DVM showed a voltage drop across the switch. The controller wasn't getting enough power.

One good thing about it was it forced me to really study the schematics to understand how everything worked. I'm now in the process of designing my own esp32 based controller, with wifi connectivity, to replace the stock control board.

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On auto start, unit sputters and I smell gas. On manual start ...

It is possibly a transfer switch issue, not the generator control board. Have an electrican kill utility power, let it start and run, then disconnect the sensing wires in the ATS. If it stops problem is ATS

to reset any shutdown code on units 2010 and newer, switch generator to 'off', press 'enter'. this will clear the code, then you can attempt to start by switching to manual.

Switch generator to off. Remove 7.5A fuse. Disconnect Negative (-) battery terminal first and then Positive terminal (+). slide battery out the front (may be a tight fit) and install the new battery reversing removal steps. Connect (+) first and (-) last. Reinstall 7.5A fuse and switch to manual to start and test run.

If you are using a Manual transfer switch, then you should manually operate the system. Why don't you use the switch it came with? Why would you use a 200a manual transfer switch on a 17kw generator? The idea is to move your critical circuits into the transfer switch panel. Then it would operate in auto.

Sounds like Generator mode switch should be "ON".

DO U HAV POWER FROM GEN ?

I install and work on these everyday. If you hooked up the transfer switch you probable have a control wire wrong. check the utility power sense wire. That lets it no when to start in auto. it could be a relay or fuses. or a control board.