Converter & transfer switch problems

I've used electronics spray Fader Lubricant on balky transfer switch relays. Unplug before you do this.

Second question; Your transfer switch is mounted behind breaker panel. It is failing. when you tap on breaker panel the switch will move to the shore power position, you can buy an aftermarket transfer switch and mount it on the floor or wall near the breaker panel easier than fooling with removing the old switch. You can also try cleaning and lubricating the old switch but it is an effort in frustration.

I've heard of things like the first problem due to the variable speed fan circuitry interacting badly with some fans that PD used at low power (and hence temperature) operation; the control circuit provided too low of a power to the fan motor or something like that. Some here were able to fix that based on advice from PD. At any rate, they generally have quite decent customer support, so calling them would be my suggestion.

Your transfer switch is sticking, which you already kind of know. It has one or two mechanical relays/contactors in it, and for whatever reason they're not operating freely when they should. Most probably the best solution is to replace it, even though it might be possible to clean or lubricate the mechanism. (If you're switching the power under load, it's possible that it may be the contacts arcing a bit and welding themselves together slightly. It's not wise to switch under load if it can possibly be helped; this is generally hard on a switch.)

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