Frequently Asked Questions
What is the F22 Message?
The “F22” will display sometimes.
This is not a fault. It is the code for the different senders.
If this setting has been accidentally changed it can be easily reset by pressing both buttons at the same time and scrolling through until it shows “F22” again.
Pressing both buttons will also reset the amount to the programmed amount.
Screen turns on but amount does not change
Display is reading out by a large amount eg 1 litre for every 3-5 litres
If your display is out by a large amount it is usually because you have managed to change the sender codes
Changing from litres to gallons or gallons to litres
Screen stays on or locks up and will not respond to any buttons
In the unlikely event that this happens, disconnect power.
Why isn't my water use being recorded?
Ensure you do not turn the display "POWER OFF" until it has gone to sleep - this takes approx 10 seconds.
Why can't I fit the sender before the pump?
If you have no room after the pump, the sender can be fitted before the pump.
Screen flashes on when no water is being used
If the magnet in the sender stops next to the Hall Effect sensor inside the sender unit and there is any slight movement in the RV. If this is the case, the simple solution is to open and close a tap quickly to move the impeller to a different position.
Turn the pump off if the 12v power for the display is coming from the same circuit (this is the recommended power source for the H2F-FM 12v model).
If the water pipe does not have any water in it, however the impeller is free to turn in air this could cause this issue. The reason this sometimes happen is if the sender is fitted to the inlet side (suction side) of the pump. In this case turn the display power off. All settings and quantity will be stored.
If the sender is fitted to the suction side of pump and there is a slight drop in pressure caused by an old pump (unable to hold prime), air getting into line or severe corrugations could all cause the unit to flash on. This is another reason we recommend the sender be fitted to the pressure side of pump.
Screen turns red (H2F-FM Flush Mount Water Tank Gauge)
Cannot find eFlow Meter or the App is Hanging (H2F-BT12 Bluetooth Water Tank Gauge)
Go to Setting > Google > Location > Choose OFF
Quit from Setting > Quit from eFlow and enter it again
eFlow shuts down (H2F-BT12 Bluetooth Water Tank Gauge)
Go to Setting > Apps > eFlow > Storage
Choose CLEAR DATA & CLEAR CACHE
Quit from Setting > Quit from eFlow and enter it again
The H2F-BT12 Bluetooth Water Tank Gauge won't work with my Android Phone
The H2F-BT12 Bluetooth Water Tank Gauge is only compatable with Android 8 or later.
Generally how long will the batteries last in the Water Tank Gauges (HF-SM & HF-BT12)
On average the batteries last approx 2 years with normal use with the HF-SM Surface Mount Water Tank Gauge and approx 12 months with the HF-BT12 Bluetooth Water Tank Gauge Model.
How many extension leads can I use?
Up to 6 leads may be joined to make 9.8m in total length.
Can I cut the sender leads?
Sender leads cannot be cut and joined – this will void your warranty.
How Many litres will the Water Gauge read?
The maximum monitoring capacity is 99,999 litres.
If I have multiple tanks does the gauge read seperately or does it read the combined amount?
Using the example of having 3 x 100 litre tanks - the gauges can read either way depending on the way you set it up.
You can set the gauge up to read one tank at a time, ie 1 x 100 litres, then when that tank is empty you can set it up to read the next water tank and so on.
Alternatively, you can set it up to read the whole combined amount of the three tanks totalling 300 litres.
What is new about the H2-FM Flush Mount Water Tank Gauge?
The FM Flush Mount replaced the RM model approx 6 years ago. It is 12v only, has a larger backlit screen and must be fitted at eye height or above as polarised, therefore you can read it in bright daylight.
Can a sender unit be fitted to the incoming water tank to measure the amount of water you put into the tank?
Put simply this cannot be done.
Can I use a 24v system with the H2-FM Flush Mount Water Tank Gauge?
Yes you would just need to get a 24-12v Transformer/Convertor.
My tank fills and empties from the same water line. Will the gauge count backwards when the tank is being filled and the water flowing in the opposite direction?
Will there be any restrictions in the water tank gauges in flow or reduce outlet water pressure if for example I run a 50 litre water tank in a canopy that is gravity fed only?
The minimum flow is 1.5 LPM. To test it you will need to have the tank nearly empty then time it with a 2 litre milk bottle. If it is over 1.5 LPM then you will have no problems.
Will the H2F-FM Flush Mount Water Tank Gauge work with a hand pump style tap that is standard in the Jayco Camper Trailers?
The H2F-FM Flush Mount Water Tank Gauge will work with a hand pump.
Can more than one sender be used with the gauges?
No only 1 sender can be used.
What are the dimensions of the H2F-FM Flush Mount Water Tank Gauge?
87mm (w) x 30 mm (d) x 80 mm (h) - please refer diagram below
What are the dimensions of the H2F-SM Surface Mount Water Tank Gauge?
71.5 mm (w) x 56 mm (h) - please refer to diagram below.
What are the dimensions of the H2F-BT12 Bluetooth Water Tank Gauge?
69 mm (w) x 40 mm (d) x 70 mm (h)
Is there a way to add a specific amount of water eg 20 litres rather than always needing to fill the tank and reset gauge to full?
When designing our gauges we wanted to keep the operation as simple as possible.
What do I do if I get a blank blue screen on my H2F-FM Flush Mount Water Tank Gauge?
The blue screen is generally caused by the power being too high.
When the power gets over 12v it can cause the screen to not work.
We would recommend checking you power levels and this should fix this issues.