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Quote: Originally posted by navver on 28/5/2023

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Do the taps work. Try each one separately to see which ones switch the pump on and off.

Very often an older caravan has microswitches fitted when new but one fails. The owner then solves the problem by fitting a pressure switch and disconnecting the microswitch circuits.

The pressure switch is usually fitted close to the pump connection point as the microswitches would all be wired in parallel by a pair wires going to each one.

When a tap is opened the pressure in the system drops switching on the pump. When the tap is closed the pressure increases switching off the pump.

Usually a damper, basically a tube with a spring in it, is used to damp the supply and stop the pump repeatedly switching on and off at low flow.

The pressure switch system is much better than the old microswitches.

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