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Water pump not working?
The first thing to check is the pump itself. A simple test can be carried out by connecting a 12v supply to the pump to check the operation. If the pump does not run, replace the pump or pump assembly. If the pump runs but doesn’t deliver water then there is a problem with the system in the caravan.
Which System do I have?
There are two different types of system in most modern caravans.
A) The Pressure Switch System.
This system has a pressure switch in the line of the water supply pipe. It senses the drop in pressure in the pipe that occurs when a tap is opened.
There are three main types of pressure switch.
1. A Whale pressure switch, situated in the pipeline normally close to the water inlet under a bunk or in a cupboard. It is white and has a screw top for adjustment. This is the most common type.
2. An integrated Whale pressure switch built into the housing of a Whale Watermaster inlet system.
3. A pressure switch built into an onboard self priming pump such as a Shurflo.
B) Microswitch System
This system has individual microswitches in each tap that operate the pump as each tap is opened.
Which System Do I Have?
The easiest way to check is to look underneath the taps. A microswitch system will have wires going directly to the taps, which a pressure switch system won't have.
Common Problems.
A) Pressure Switch,
1. Pressure switch adjustment,(see caravan handbook for method)
2. 12v problem, interruption of 12v to the pressure switch or pump housing.
3. Pressure switch failure.
4. Isolation switch failure.
B) Microswitch System.
This system has individual microswitches in each tap that operate the pump as each tap is opened.
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