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Old 07-20-2014, 11:55 AM   #1
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Serious Transfer Switch Problem on 2013 Phaeton

We are currently on a trip and staying at an RV park in northern Ca. (its hot).
Friday night we turned on all three AC units on our 40 foot Pheaton. After 15 minutes one AC unit started making horrible noises. By the time I turned it off and shut off the circuit breaker, Another AC unit began making loud imploding noises. I shut off both running units. I heard a loud continuing pounding noise and discovered it was the transfer switch. Unplugged the shore power and it stopped. Saturday morning pounding started again. Had RV Park folks check voltage at power. It was consistent 248 volts. Later in day turned on Microwave oven and switch started pounding--microwave was going on and off with the pounding. Unplugged and started generator. One AC unit will not go on, one continues to make horrible noises, and one works. At 1 a.m. this morning pounding started again with nothing going on, except maybe the refrigerator.
By the time I got dressed and out to the compartment, it stopped. We are fairly new to RVs and I would appreciate any advise any of you might have. Considering cutting trip short and going back to Huntington Beach and dealer.
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Old 07-20-2014, 12:12 PM   #2
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Quote:
Originally Posted by EllennGarry View Post
It was consistent 248 volts.
Really?

What was the voltage on each leg? Sounds like overvoltage issue, possible open neutral. I hope you have a good energy management/surge protection system.

The fact that the generator would not power and operate all systems, would indicate you have experienced a voltage issue.

You could have a mobile tech check out the situation, no fun going without A/C.

Fred
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Old 07-20-2014, 12:38 PM   #3
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If the power at the pedestal is correct, and there's no open neutral or similar, then you've got a bad transfer switch which is opening and closing on it's own. That's the thumping noise you're hearing, and it matches the behavior of the microwave.

You need to either replace the transfer switch or bypass it totally right away, before it takes out your last AC unit and the fridge. Then you need to get the AC units checked, they'll probably need new start capacitors and maybe some other components.
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Old 07-20-2014, 12:45 PM   #4
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Your 50 amp RV service is four conductors. Two are 'Hot,' one neutral, and a ground. Most all RVs only use the two 'hot' legs and the neutral to provide two 50 amp 120 v power 'legs' to the RV. These legs are divided up by your 120 v power panel. Unless you have a 240 v cooktop, dryer, or other 240 v appliance, no circuit in the RV should be 240 v.

Using a multimeter, you should check the pedestal outlet. The only 240 v reading should be between the two 'hots.' A properly wired pedestal should have the two hot legs 180 out of phase. If it is, you'll measure 240 v across the two hot legs. If it's not, you'd measure 0 v across the two hots.



Edit: You're correct FlyingDiver, my bad.
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Old 07-20-2014, 12:52 PM   #5
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Using a multimeter, you should check the pedestal outlet. The only 240 v reading should be between the two 'hots.' A properly wired pedestal should have the two hot legs 180 out of phase. If it is, you'll measure 240 v across the two hot legs. If it's not, you'd measure 120 v across the two hots.
Actually, if the hot legs are mis-wired (same phase), you'll get 0V between them.
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Old 07-20-2014, 07:45 PM   #6
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Had similar knocking sound...last day of warranty ...staying at Lazydays campground! Would start and stop.. LD Took me in the next day, replaced the transfer switch...all is well.
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Old 07-21-2014, 10:34 AM   #7
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I had the same thing happen when our Discovery was new. Failed brand new transfer switch.
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Old 07-21-2014, 11:26 AM   #8
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I don't know where you stand regarding your warranty, but I would suggest contacting Don Boyd at Tiffin, (256) 356-0261 Ext 3290, don.boyd@tiffinmotorhomes.com
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Old 07-21-2014, 11:43 AM   #9
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Everytime I look at a Tiffin coach they tell me BOB is available for everything-why don't you call him when you have a problem
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Old 07-21-2014, 01:25 PM   #10
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Bob is not your first level of contact - he is the last one and only if you have tried other avenues. Don Boyd is the best contact for this situation. I think your transfer switch is bad and needs replacement. Don Boyd can ship a new one to you and you can have a mobile tech replace it for you. Don can also tell you step by step how to bypass the transfer switch until the new one arrives. Chances are a mobile tech also knows how to bypass it, it isn't that hard to do. Depending on the age of your coach, Don may ship you a replacement free of charge. Call Don.
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