Chaffoteaux
Chronic Pressure Loss
Furnace frequently loses pressure and needs topping up often.
Advertisements
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Advertisements
Possible Causes
Leaking radiator or pipework, Faulty pressure relief valve (PRV) passing water, Ruptured expansion vessel diaphragm, Micro-leaks in heat exchanger
How to Fix / Troubleshooting
Safety: Allow system to cool before inspecting PRV discharge pipe.
- Check PRV discharge: Locate the pressure relief valve discharge pipe (usually copper, exiting outside). If water drips regularly, the PRV may be passing.
- Inspect for visible leaks: Check all radiators, valves, and accessible pipes for damp patches or staining.
- Expansion vessel test (professional): A technician can check the expansion vessel pre-charge via the Schrader valve and recharge or replace it if the diaphragm has failed.
- Avoid constant topping up: Repeatedly adding fresh water increases corrosion. Find and fix the leak instead.
Advertisements
Repair Difficulty
Medium
3/5
Required Part
Expansion Vessel
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements