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Old 10-17-2015, 12:34 PM   #1
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2016 35QBA Water Pump Problem

Our new coach has a problem and I hope someone can help. The water pump will not turn on. All fuses have been checked. We have only been on one trip and it worked fine. Unfortunately, Tiffin Service is closed on weekends. Any ideas?
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Old 10-17-2015, 12:59 PM   #2
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Are you hooked up to city water or is your tank full of water? Pump only works if water tank has water in it. Dave
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Old 10-17-2015, 01:05 PM   #3
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Yes, plenty of water in tank. Do you know where the fuse for the water pump is? It is not marked on the panel outside the bathroom.
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Old 10-17-2015, 03:03 PM   #4
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I have a 2013 which is probably different but it is #5 breaker. I would think if the 12 volt breaker was tripped it would be popped out. See if any of those breakers are popped out. If not got to the pump and check the wiring. Mine are wire nutted at the pump which can vibrate loose. Check the positive side and the ground side.
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Old 10-17-2015, 03:09 PM   #5
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Is there a valve behind the pump that could be turned off? This is only if the pump was working correctly previously.

We have several fill options and if the switch to fill the water tank is turned in the fill position the pump does not work. Not sure if Tiffins are the same.
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Old 10-17-2015, 04:09 PM   #6
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sorry i haven't been on sys for a while, in the bedroom on my 2012ca is door under one of the drawers that has the flip switches for curcit breakers . dave
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Old 10-18-2015, 08:19 AM   #7
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The pump will work with 12 volts provided externally with a battery charger. There is no power coming from within the coach. All fuses are in. On the dc panel all lights are green.
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Old 10-18-2015, 11:56 AM   #8
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Is the light on the water pump switch on?
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Old 10-18-2015, 12:05 PM   #9
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Yes, water pump light is on on the switch. Everything seems to work, except the pump. Hopefully, tomorrow Tiffin will have an answer.
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Old 10-18-2015, 12:09 PM   #10
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Check the connections at the pump and make sure a wire is not loose
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Old 10-18-2015, 07:48 PM   #11
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The fact that the water pump works when connected to an external power source, rules out the pump as the problem. Should have power if the light is on. I'd put a voltmeter on the positive wire at the pump, negative probe on frame, to see if the 12v is on the wire as it's supposed to be. If it is, probably a bad ground wire which you should be able to verify with the resistance scale on the meter.

I've never had to get into that circuitry, but I think there is a relay that controls the pump....if I recall correctly reading in a forum before.
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Old 10-25-2015, 04:05 PM   #12
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Finally got in touch with a Tiffin electrical technician. There is a 15 dc fuse in the battery compartment in the stairwell. The fuse was indeed blown. As far as I know it is the only one for the water pump. Tiffin said it was fuse #19 on the dc fuse panel inside the coach near the bathroom. The fuse inside was not pushed out and it is not marked on the panel. I wish Tiffin would have marked the panel or at least have it in the manual as to where the 15 dc fuse is. Thanks everyone for you help and suggestions. This is a learning curve for us.
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Old 10-25-2015, 05:50 PM   #13
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How was the light on the switch on with the fuse blown?
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Old 10-25-2015, 07:19 PM   #14
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Rodney, that is a big mystery! I can't understand why they would put a fuse to the water pump in a wire bundle in the battery house. Never would of found it if we hadn't called Tiffin.
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