Fixing No Water Flow from Taps
Diagnose and fix the most common reasons why water stops flowing from your motorhome taps.
What This Is
Loss of water flow is one of the most frequently reported problems on motorhome forums. In the vast majority of cases, the cause is simple and can be fixed without tools. This guide walks through every likely cause in order of likelihood.
Tools & Parts Required
- Torch
- Flathead screwdriver (for filter access)
- Spare inline filter (recommended)
Step-by-Step Instructions
- 1
Check the fresh water tank level first. The gauge on your control panel or the tank itself will show the level. An empty tank is the most common cause of no water flow.
- 2
Check that the water pump is switched on. Most motorhomes have a separate pump switch on the control panel. It is easy to accidentally switch it off.
- 3
Listen for the pump running when you open a tap. If you hear the pump but get no water, the issue is likely an airlock or a blocked filter.
- 4
Locate the inline water filter, usually fitted between the tank and the pump. Remove it and inspect for blockage. Rinse under clean water or replace if heavily fouled.
- 5
To clear an airlock, open all taps fully and switch the pump on and off several times in quick succession. This often dislodges trapped air.
- 6
Check the pump itself. It should be firmly mounted and all hose connections tight. A loose connection on the inlet side will cause the pump to draw air instead of water.
- 7
If the pump does not run at all, check the fuse for the pump circuit on your fuse board. Replace if blown.
- 8
If using an external water connection (aquaroll with a submersible pump), check the submersible pump is submerged and its cable is connected properly.
Common Mistakes to Avoid
- Forgetting to check the tank level — always check this first.
- Running the pump dry for extended periods — this damages the pump seals.
- Neglecting the inline filter — it should be cleaned or replaced at least annually.
Safety Warnings
- Never drink water from a motorhome tank that has been standing for more than a few days without sanitising.
- Ensure all food-grade hoses and fittings are used for the drinking water system.
When to Call a Professional
If the pump runs but produces no pressure even with a full tank and clear filter, the pump diaphragm may have failed. Replacement is straightforward but requires the correct pump model.
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