Water level indicator fault

[OldWomble]

Morning all and Happy New Year

Both the level indicators on our Auto-Sleepers PVC are showing inaccurate readings. The fresh tank shows 1/4 full when it’s completely empty and the waste tank also shows 1/4 when that is full to the brim.
So far, I have drained and cleaned both tanks with tank cleaners and citric acid, flushed them several times and then checked everything again. No change!
I then removed the sensors from the fresh tank, cleaned them and refitted them. No change!
I have now disconnected the wiring from the lower three sensors on the fresh tank and still the gauge shows 1/4 full. This tells me there is something wrong with the control system. Would any of you know if there is any adjustment on the sensitivity? It’s a Sergeant EC700 unit.

 

[OldWomble]

alternatively, has anyone ever ripped out the Sargent unit and retrofitted something that works?

 

[OldWomble]

Oops, sorry it’s an EC500 with a 480 display.

 

[Freerace]

Morning all and Happy New Year

Both the level indicators on our Auto-Sleepers PVC are showing inaccurate readings. The fresh tank shows 1/4 full when it’s completely empty and the waste tank also shows 1/4 when that is full to the brim.
So far, I have drained and cleaned both tanks with tank cleaners and citric acid, flushed them several times and then checked everything again. No change!
I then removed the sensors from the fresh tank, cleaned them and refitted them. No change!
I have now disconnected the wiring from the lower three sensors on the fresh tank and still the gauge shows 1/4 full. This tells me there is something wrong with the control system. Would any of you know if there is any adjustment on the sensitivity? It’s a Sergeant EC700 unit.

Hi. I’m having exactly the same problem and have also tried intense cleaning etc. but no joy. My question is, where are the level sensors and has anyone replaced or upgraded them. Would be great to have this working. It’s never been right!

 

[GeoffnDee]

Freerace , If your PSU is also an Sargent built item there are replacement sensors available in the www.sargentltd.co.uk shop. , if you have another make of PSU there should also be sensors available elsewhere.

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[Barriesimpson]

Well I thought that was normal on most, if not all, motorhomes. My fresh water level only shows 100, 75, 50 and 25% so we need to guess the real level. The grey water level is either 0 or 100%, but is easier to guess because it fills from the fresh water that we use. So when fresh is at 50% so is grey.

 

[pappajohn]

but is easier to guess because it fills from the fresh water that we use. So when fresh is at 50% so is grey

But only if both tanks are the came capacity.
Grey is often slightly smaller than fresh as some fresh is drunk and won't end up in the grey tank.

 

[Barriesimpson]

But only if both tanks are the came capacity.
Grey is often slightly smaller than fresh as some fresh is drunk and won't end up in the grey tank.

Yes, mine are both 100 litres. We don't drink the fresh as we cannot be sure it's good here, so use bottled water for drinking and cooking.

 

[maison]

We are on our 9th motorhome over a period of 40+ years. Most of the fresh water/grey water gauges have been wildly inaccurate.

 

[Barriesimpson]

We are on our 9th motorhome over a period of 40+ years. Most of the fresh water/grey water gauges have been wildly inaccurate.

This is what I understood after reading posts here.

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[maison]

This is what I understood after reading posts here.

We recently had our annual habitation check, required for warranty.

The check list showed both fresh and waste water tanks reading within limits. On returning home the waste tank showed 75% full but was actually empty!

 

[pappajohn]

The check list showed both fresh and waste water tanks reading within limits. On returning home the waste tank showed 75% full

Of course it's within limits..... Anywhere between full and empty is within limits.... Full and empty ARE the limits.

 

[Wee Bold Davy]

We have the same issue as most seem to have. Our van has a 90ltr tank and the way we deal with it is by using a 10ltr watering can to fill it from empty then use a 10ltr plastic bucket to empty the grey waste and have an educated estimate of the weight of the toilet cassette. We're never far out

 

[Reallyretired]

My fresh gauge goes from 100p% to 75 on filling a kettle, then soon after to 50%. We know when it says 50% it's nearly full, 25% around half. Oddly the waste gauge is quite accurate.

 

[pat100]

I hold down the button for 30s then release for 30s then repeat that twice. Seem to get a reasonably reliable reading. Not exactly instantaneous
I also recalibrate it frequently (for luck)
Whale illuminated bars thing.

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[Boaty]

Waste tank full empty or full likely has this kind of sensor:

Works well as it's clear of waste, or should be .
Fresh is from sensors up the tank:

Sensors can be checked individually. Pair with power (bottom lead) probe and a.n. other in container with water and check display. This should help identify the fault.

 

[royw]

In my pilote I have fitted krus resistive float level sensors, this connects into my victron cerbo, i can see to an accuracy of .5 litre in my fresh water tank, i can monitor this direct via bt, via my touch display or via vrm portal anywhere in the world. I can get level alarms via email or app alerts.

 

[Two on Tour]

Morning all and Happy New Year

Both the level indicators on our Auto-Sleepers PVC are showing inaccurate readings. The fresh tank shows 1/4 full when it’s completely empty and the waste tank also shows 1/4 when that is full to the brim.
So far, I have drained and cleaned both tanks with tank cleaners and citric acid, flushed them several times and then checked everything again. No change!
I then removed the sensors from the fresh tank, cleaned them and refitted them. No change!
I have now disconnected the wiring from the lower three sensors on the fresh tank and still the gauge shows 1/4 full. This tells me there is something wrong with the control system. Would any of you know if there is any adjustment on the sensitivity? It’s a Sergeant EC700 unit.

Both our fresh and grey waste tanks are external under our van, and I have fitted Mopeka Pro wireless sensors to the underside of our tanks and these are very accurate and adjustable to suit the capacity of your tanks via the phone app.

 

[Barriesimpson]

Both our fresh and grey waste tanks are external under our van, and I have fitted Mopeka Pro wireless sensors to the underside of our tanks and these are very accurate and adjustable to suit the capacity of your tanks via the phone app.

View attachment 931315

That's interesting, I need to look into those sensors.

 

[Old Barrian]

Not a problem unique to motorhomes. Have just hired a narrowboat for a week and on taking it over was was told by the boatyard chappie never to believe the freshwater tank gauge but to fill up every day. Was slightly disconcerted to find subsequently that the toilet tank gauges were similarly useless not changing from zero for the whole week!

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