Tel: +44 (0)1603 720999

FAQS Frequently Asked Questions

Autosave FAQs

Everything you wanted to know about Autosave controls…
PLEASE NOTE: INSTALLATION, CONNECTION AND ANY MAINTENANCE SHOULD BE CARRIED OUT BY A SUITABLY QUALIFIED PERSON IN ACCORDANCE WITH CURRENT AND LOCAL REGULATIONS

Yes, the front covers of both battery and mains versions are designed to be removed for installation or servicing. Simply grip wires above connector on the inside of the front cover and carefully ease off the connector, wiggling sideways if necessary.
Be careful when re-connecting to ensure connectors are not mis-aligned and that the locking barb on the free connector locates against the grip on the fixed connector.


Autosave B01, B02 The LED should flash briefly each time the battery pack is connected. If not, test batteries with a meter if possible, try rotating cells with finger to improve contact, replace if in doubt. Printed circuit boards of ‘iss 6’ and earlier have fuses fitted.
These will blow if the battery pack is connected in reverse! Replace with 1A 20x5mm quick blow glass type.

Autosave M01, M02 The LED should flash briefly each time the electricity is turned on. If not, check the incoming supply at the terminals and also the fuse (in vertical fuseholder) near the mains terminal block. Replace if necessary with a 250mA 20x5mm quick blow glass type.


If the batteries have come to the end of their life (they usually last 3 to 4 years) the LED will blink to indicate that replacement is necessary. (Under normal circumstances the LED does not come on at all in order to reduce battery consumption and to deter attention by vandals). After approximately 2 weeks the Autosave will close the valve as a fail-safe feature, the LED will continue to blink until the batteries are totally exhausted.


If this happens the Autosave is still in setup mode and requires the cistern fill time (valve opening) to be set. Please see installation instructions.


The Autosave should be setup at installation so that the valve opens long enough to fill the cistern and start flushing. If this does not happen check that the isolation service valve is fully open and if necessary reset the Autosave and set the cistern fill time again. See instructions!


Autosave B01, B02 Disconnect battery pack then press and hold blue FILL button whilst re-connecting the battery pack. Upon releasing the button, LED will flash twice to confirm set-up mode.

Autosave M01, M02 Turn on electricity to Autosave, valve will click open. Press and hold blue FILL button until valve opens (takes approx. 4 seconds. Upon release of button LED will flash twice to confirm set-up mode.


Autosave B01, B02 Yes, proceed with setting the fill time by pressing and releasing blue fill button, valve will open and LED will flash continuously as cistern fills. As soon as cistern starts to flush disconnect battery pack then re-connect the battery pack. This will allow the cistern to empty, close the valve and abort the sequence. Once the cistern is empty you can proceed with setting the cistern fill time.

Autosave M01, M02 Yes, proceed with setting the fill time by pressing and releasing blue fill button, valve will open and LED will flash continuously as cistern fills. As soon as cistern starts to flush turn off power to Autosave. This will allow the cistern to empty and abort the sequence. Once the cistern is empty you can proceed with setting the cistern fill time.


Autosave B01, B02 Utilise latching solenoid valves which requires short pulses to open and close them – indicated by an audible click. When the batteries are connected the valve will always CLOSE first of all and then OPEN a few seconds later to start a fill and flush cycle.

If water flows when the valve has closed then the valve may have failed due to a long period of use in a hard water area. A replacement valve body kit with instructions is available from Watersavers.

Autosave M01, M02 Turn off the electricity supply. If water still flows then the valve may have failed due to a long period of use in a hard water area. A replacement valve body kit with instructions is available from Watersavers.


Autosave M01, M02 Mains operated solenoid valves often have a characteristic buzz or hum which is perfectly ok. Where silence is important we would recommend installing a battery operated Autosave.


To protect your Autosave from attack by vandals, we can supply a protective wire cage as an accessory. This tough steel mesh cage can be retro fitted to all Autosave controls.


Cisterns filled by the traditional trickle cock method waste thousands of litres of water each year by flushing the urinal 24 hours a day, 365 days per year regardless of whether or not the facility is being used!

The Autosave works by flushing the urinal ‘On Demand’. When occupancy is detected in the toilet area, the cistern will fill and flush after a preset time period, irrespective of how many people use the toilet during that time. If the toilet is unused i.e. at night or weekends, the Autosave will initiate a hygiene flush every 12 or 24 hours (programmable) to keep the bowl fresh and stop the traps from furring up.


Manufacture of these models ceased in 1992. Spare parts are no longer available, however, in accordance with our environmental policy we will continue to provide support as far as we are able.

If unserviceable we would recommend replacement with an Autosave M01 with a built-in PIR sensor for exposed cistern or an Autosave M02 with remote sensor for installations with concealed cistern.


The battery operated Autosave B01 & B02 are simple to install and ideally suited where a mains supply is not readily available, moreover 4 standard AA alkaline cells will provide 3–4 years use before they need replacing. A flashing Led will indicate low battery status.

The Mains versions (M01 & M02)  whilst initially slightly more expensive are a fit and forget solution – furthermore when power is removed the solenoid valve closes (fail safe) and there is no need to reset when the power is restored.


Yes, the Autosave B02 is a remote valve option. The solenoid valve is supplied pre-wired with a 2m length of cable – which provides great flexibility in installation.


By purchasing an Autosave with integral digital counter, actual numbers of flushes and hence quantity of water used can readily be calculated and monitored over a period of time. Refer to your water bill for local costs.
Savings of up to 80% can be achieved giving a payback time of typically 6 to 12 months.


Solenoid shut off valve FAQs

Hints and tips on choosing & using shut off valves

Watersaver’s brass solenoid shut off valves enable a water supply to be turned on energising the coil of the valve with 240v AC (SVM range). When de-energised the valve will close – shutting off the water supply.


In a domestic property or small commercial property the shut off valve is plumbed in after and close to the main stopcock. Choose the valve size according to the size of your incoming water main. BSP sizes and (valve product code) are: ½” (SVM-15), ¾” (SVM-22) & 1″ (SVM-28).
Fit male BSP to compression fitting couplers to plumb into copper pipe. Ensure arrow on brass body matches direction of water flow. 


Valves are designed to operate properly when mounted in any position. However for optimum life and performance the solenoid coil should be mounted vertically and upright to reduce the possibility of foreign matter accumulating in the solenoid base sub-assembly area.


Watersavers solenoid shut off valves are each supplied with a DIN connector which is pushed on to the coil of the valve and held in place by a screw. Use 0.75mm² flexible cable to connect to terminals 1 & 2 (polarity not important). An earth connection can be made to the third terminal although all water pipework should be bonded to earth. See current and local regulations.
For ideas and products to turn the valves on & off please see


  • Check that the arrow on the brass body matches the direction of water flow
  • Ensure there is sufficient pressure of water. The SVM range of valves require a minimum of 0.35 BAR (11.5 ft water) in order to operate.
  • Check there is 240v AC at the coil terminals, use a test meter if necessary. The coil should be warm to the touch if the power has been on for a few minutes.
  • With a test meter check there is resistance between the two smaller terminals 1 & 2 on the coil. It should read about 3000 ohms (3kΩ). If the coil is open circuit contact Watersavers to obtain a replacement part.
  • It is possible that some debris has entered the valve and caused it to malfunction. The valve can be carefully dismantled to check for this.

Watersavers recommend the fitting of a gauze or Y strainer to the inlet of the valve to prevent the ingress of debris into the valve.


Valves supplied by Watersavers have female BSP threads. Couplers to convert to compression fit are readily available from plumbing merchants.


In the event of a power cut the solenoid valve will close, shutting off the water. This is known as “fail safe”.
Consideration should be given to this fact before installation to find out if there are any emergency facilities, appliances or machines such as fire sprinklers, fish aquariums, toilets etc that may raise safety or health issues if water was not available


The standard SVM range of valves cannot be overriden however here are three options for consideration:

  • Watersavers can supply a special version of shut off valve with a manual override screw. Simply turn through 90° with a screwdriver.
  • Plumb in parallel pipework with a tap that can be opened in the event of a power cut.
  • Provide a tap or hose outlet between the stopcock and the solenoid shut off valve for use in an emergency

Watersavers brass solenoid shut off valves typically consume 4 watts of power which means that they can be run continuously for about 10 days for the cost of 1 unit of electricity!


Yes, our OSV range operate from 24v DC for use with our Omnisava multifunction control and for other low voltage applications.
We can also supply other coil voltages and valve functions – please contact us with your requirements.


Our SVM & OSV range of pilot operated valves require a minimum pressure of 0.35 BAR (11.5 feet of water) to operate. The maximum operating pressure is 13 BAR (½” – 1″ sizes) and 10 BAR (1¼” – 2″ sizes).


Use our Omnisava multifunction control to operate a 24v OSV solenoid valve. The float switch can be connected to the input of the Omnisava such that the valve can be opened or closed as required. Please contact our technical department on 01603 720999 to discuss your requirements.


Omnisava FAQs

Everything you wanted to know about the Omnisava…
PLEASE NOTE: INSTALLATION, CONNECTION AND ANY MAINTENANCE SHOULD BE CARRIED OUT BY A SUITABLY QUALIFIED PERSON IN ACCORDANCE WITH CURRENT AND LOCAL REGULATIONS

A multifunction control designed to save water, compressed air, steam and other expensive commodities used across all industry sectors. Responding to PIR or proximity sensors, the Omnisava eliminates unnecessary waste and saves money by supplying only on demand.


  • In a machine shop / garage using many compressed air tools there is always costly leakage in hoses and fittings. Fit an Omnisava controlled by PIR sensor to shut off the air at the compressor when no one is about. Kills the problem dead. Function 0
  • Conveyor belt production line using compressed air to dry / blow products. Fit Omnisava with proximity sensor to detect products. Shut off air when conveyor stops or when there are no products ie end of production run, line stoppage etc. Function 1, 2, 3 or 4
  • Isolate toilet area, handbasins, WC’s etc by installing Omnisava with PIR sensor. Shuts off water when no one is about, prevents wastage from leaks, vandallism etc

This is very difficult to quantify as it depends on so many factors. For those factories where compressed air or water is running 24/7 dramatic savings of between 50 and 90% can be expected. In most cases the Omnisava should pay fr itself well within one year.


Use a PIR (Passive Infrared) sensor to turn off water, air, motors, heaters etc when an area is unoccupied. Can be applied to factory operatives, passengers, shoppers, staff etc etc. Read instructions carefully particularly with regard to positioning the sensor.


Yes, simply select NC on the SENSOR slide switch to invert the logic of the Omnisava input.


An NPN sensor shorts or sinks current from the Omnisava NPN input to – terminal. A PNP sensor shorts or sources current into the Omnisava PNP input.


By simulating the sensor inut the test button enables the installer to verify the control function. Simply set a short (1-5 second) time period and push the button. The green led (and valve if fitted) will operate according to the function selected.


Yes, connect switch across terminals 4 & 6 (npn input) or 5 & 7 (pnp input). Set the SENSOR polarity switch to NO or NC according to the chosen type of switch.


No, the Omnisava has one built in, however an additional diode connected correctly (cathode or band to +24v) will be quite ok.


Contact Technical Support or call 01603 720999 for assistance. If the function you need is not there – we may (depending upon the application) be able to program it in for you!


© 2017 Watersavers : Technova Court, Earl Road, Rackheath Industrial Estate, Norwich, Norfolk, NR13 6NT : Tel: +44 (0)1603 720999 : Fax: +44 (0)1603 721499 : sales@watersavers.co.uk