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Old 03-24-2023, 02:11 PM   #1
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HWH 625 Levelling System Relay

My HWH has given me intermittent problems. I had a mobile RV Tech come out and with the help of HWH on the phone was able to track it to a bad relay at the pump. The manual says the relay is INTERMITTENT DUTY but they look like a standard off the shelf relay. The relay was ordered two weeks ago and I was told today that it was lost in shipment. I'm scheduled to leave on a one week trip in a week. Does anybody know if these can be purchased locally at a parts store or if they are proprietary and have to come from HWH?
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Old 03-24-2023, 02:25 PM   #2
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The electrons wonít know it didnít come from HWH.

Just ensure you get a relay with appropriate amperage rating. Cole Hersee and Blue Sea make good ones.
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Old 03-24-2023, 04:37 PM   #3
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For extra credit, go with continuous duty relays if they'll fit. I mean, why not?
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Old 03-24-2023, 08:26 PM   #4
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Here's what you need. It's the same as the master solenoid and is continuous duty but will substitute for the intermittent. If you carry a spare, make it one of these as it will work in both locations. You should be able to get one in a couple of days. This is the brand of solenoid that HWH uses.
https://www.amazon.com/Trombetta-684.../dp/B00L7YK7CE

Here's a document on troubleshooting and repair of the HWH system.
Attached Files
File Type: pdf HWH-Hydraulics.pdf (465.1 KB, 9 views)
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Old 03-25-2023, 06:45 AM   #5
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Quote:
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Here's what you need. It's the same as the master solenoid and is continuous duty but will substitute for the intermittent. If you carry a spare, make it one of these as it will work in both locations. You should be able to get one in a couple of days. This is the brand of solenoid that HWH uses.
https://www.amazon.com/Trombetta-684.../dp/B00L7YK7CE

Here's a document on troubleshooting and repair of the HWH system.
Thank you so much. That's exactly what I was hoping for. Given that they are both available, would it be prudent to replace the pump relay with the intermittent and carry the continuous for a spare? Or does it not make any difference?
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Old 03-25-2023, 10:41 AM   #6
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The only difference is in the construction of the coil. One will overheat if left energized for too long, and one won't. There are a couple possible ways to make this happen, but how they do it is not really important.

I'd put in the continuous duty one and carry the intermittent duty one as a spare, but either approach will work.
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Old 03-25-2023, 10:27 PM   #7
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Last year my HWH 610 central ground leveling system stopped working, my problem too was a 12V solenoid quit working. I replace both of mine with these dump-trailer solenoids which are an exact match to the OEM solenoids because the terminals are in the correct position. That was Jan, 2022 and they have worked perfectly since.
BTW if you ever need to replace the motor they are cheaper from Northern Hydraulics, same part number; but the motor is updated with bearings instead of bronze bushings on the shaft.
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Old 03-26-2023, 06:34 AM   #8
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I use these for my hydraulics systems : https://www.amazon.de/dp/B06ZXXRF6P?...roduct_details


500A is about 300% overrated, so it might last
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Old 03-26-2023, 06:51 AM   #9
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Last year my HWH 610 central ground leveling system stopped working, my problem too was a 12V solenoid quit working. I replace both of mine with these dump-trailer solenoids which are an exact match to the OEM solenoids because the terminals are in the correct position. That was Jan, 2022 and they have worked perfectly since.
BTW if you ever need to replace the motor they are cheaper from Northern Hydraulics, same part number; but the motor is updated with bearings instead of bronze bushings on the shaft.
That's funny. I have looked at the one on my dump trailer and thought they looked identical.
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Old 03-30-2023, 09:22 AM   #10
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the continuous duty will work temporarily, but there is a reason for using the intermittent duty relay. it latches in much better than the continuously duty. it can take the high amp draw better. the continuously duty will maintain the constant draw better than the intermittent one.
there are some on the internet that do the same thing.
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Old 04-14-2023, 09:49 AM   #11
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the continuous duty will work temporarily, but there is a reason for using the intermittent duty relay. it latches in much better than the continuously duty. it can take the high amp draw better. the continuously duty will maintain the constant draw better than the intermittent one.
there are some on the internet that do the same thing.
That totally makes sense.Thank you AZ Pete. So the continuous duty will get you out of a jam for either, but you should install an intermittent duty for a permanent repair.
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Old 04-14-2023, 12:38 PM   #12
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Quote:
Originally Posted by Scottybdivin View Post
My HWH has given me intermittent problems. I had a mobile RV Tech come out and with the help of HWH on the phone was able to track it to a bad relay at the pump. The manual says the relay is INTERMITTENT DUTY but they look like a standard off the shelf relay. The relay was ordered two weeks ago and I was told today that it was lost in shipment. I'm scheduled to leave on a one week trip in a week. Does anybody know if these can be purchased locally at a parts store or if they are proprietary and have to come from HWH?
Please study the differences between a "continuous Duty" relay and an "Intermittent Duty" relay, it matters, particularly with a high current motor load. You need an Intermittent relay.

I purchased a replacement on Amazon for 26 bucks, and it straps right on the motor the same as the OEM. The item listed below comes with hardware.

Part Number: 684-1251-212 684-1261-212 6841261212 6841251212 HYD08831

Application:

Compatible with Trombetta

4 Terminals Current 150A Max 800A with Nuts and Bolts

Voltage: 12V

Continuous Amps: 150

Surge Amps: 800

Mounting: Flat 180(F180)

Duty Cycle: Intermittent
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Old 04-14-2023, 05:45 PM   #13
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Please study the differences between a "continuous Duty" relay and an "Intermittent Duty" relay, it matters, particularly with a high current motor load. You need an Intermittent relay.

<snip>
Sorry, but this is unimportant. What is important is the current ratings for the two solenoids. It could be the case that HWH uses a higher-rated relay for the intermittent than for the continuous relay, but that's not the only answer, and could have been a less than ideal design choice.

Here's an example of a continuous duty relay that would be find in this application if it fit: https://www.amazon.com/TROMBETTA-TER...2-63e904010ad0
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Old 04-15-2023, 06:38 AM   #14
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Originally Posted by n2zon View Post
Sorry, but this is unimportant. What is important is the current ratings for the two solenoids. It could be the case that HWH uses a higher-rated relay for the intermittent than for the continuous relay, but that's not the only answer, and could have been a less than ideal design choice.

Here's an example of a continuous duty relay that would be find in this application if it fit: https://www.amazon.com/TROMBETTA-TER...2-63e904010ad0
Keeping a Motorhome within specification is very important, especially for people who understand correctness of application and keeping their MH within that spec. Advising someone to be out of spec can jeopardize insurance coverages. The OEM specifications are very important and most experienced and intelligent RVers recognize that and comply. You can do what you want, but the last thing I would do is give a fellow RVer bad advice. We will have to agree to disagree on your point of view.
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