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Old 09-28-2016, 10:07 AM   #1
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HWH drops air, no pump

I have a 2002 MDD (on an earlier post I said I had a 2003 by mistake) and am having another issue with my HWH leveling system. After hitting the ON button twice, the air dumps as usual, but the pump doesn't cycle, nor can I level the rig using the manual buttons. This happened after pulling into a campsite last night, but I had no problems with the system as we were preparing to leave home. We had to break camp and come back home to work on it, if we can get an idea of what's causing it. Any ideas?

It is an HWH 610 system, or at least that is what the designation is for the manual that I have.
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Old 09-28-2016, 10:31 AM   #2
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If the panel lights up and you are dumping air, then the control box has power. I would go check the solenoid connections at the pump first. It should have a good ground and 12v.

Have someone press a button and see if the solenoid clicks to try and run the pump motor, if it clicks, check motor connections. If it doesn't and you have good voltage at the solenoid, then it went bad or the control box signal is interrupted. So then go to the control box and verify that you get a good signal out of it when a button is pressed, you should have 2 signals, one for the jack solenoid and one for the pump motor solenoid.

If you have good voltage and a good signal and a click at the solenoid, then you have a bad pump motor.
You need to also check all the safety switch inputs and the float switch in the reservoir. Those can go bad as well and cause the system to not fully function.

If you are not familiar with troubleshooting electrical components, I suggest you hire an rv service tech
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Old 09-28-2016, 10:41 AM   #3
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Could you add your HWH leveling system model number to your post.

625 ?

Two problems I've had with my HWH system , one involved corrosion in the main system fuse ( 40 amp near the pump ) picture below. The second was internal ground of the motor brushes that required repair of the motor.
Link to my repair.

HWH Pump motor failure

Another member with a 625 series HWH system had the same fuse issue, fuse was passing power but wouldn't pass enough amps for the system to operate properly.
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Old 09-28-2016, 11:53 AM   #4
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Okay, so I took the rig to a flat spot after sitting overnight plugged in, and it operated perfectly. However, there is a groaning noise coming from the HWH compartment when the air dumps which has been going on since I had low fluid. I'm curious, though, about what could have happened at the campsite that made my HWH system inop.
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Old 09-28-2016, 01:17 PM   #5
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When you tried to level initially, were you plugged in to power or were you on battery power? If on battery power, the jacks not descending could mean that the batteries had insufficient power to drive the pump. After charging overnight, they were sufficiently charged to do the job. Just a thought.
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Old 09-29-2016, 06:19 AM   #6
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Before going too much further you need to check the connections on the back of the console drawer, WRV is infamous for bad wiring. I had a ground wire break years ago that caused the HWH system to not operate at all. Extending the drawer can cause the cabling to move thus the intermittent operation.
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Old 09-29-2016, 10:04 AM   #7
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I plugged in before leveling, but I didn't like the feel of the way the plug attached to the receptacle. It was a 50 amp receptacle, but it was showing as 30 amp on my control panel, but it did show that I had 13.5 volts on the batteries.
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Old 09-29-2016, 10:59 AM   #8
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Quote:
Originally Posted by NW Trekker View Post
I plugged in before leveling, but I didn't like the feel of the way the plug attached to the receptacle. It was a 50 amp receptacle, but it was showing as 30 amp on my control panel, but it did show that I had 13.5 volts on the batteries.

You only had one 120 line connected (the receptacle was bad) of the two in the 50 amp line (the campground had a problem&#128561 so you only showed 30 amps. 13.5 volts on the batteries was good and even with only 30 amps the inverter should have been working.
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